71 results about "Sodium tetraphenylborate" patented technology

The invention discloses a method for preparing a B-doped g-C3N4 photocatalyst through nonmetal liquid-phase doping, and belongs to the technical field of hydrogen production through photocatalytic materials. According to the prepared organic polymer semiconductor material g-C3N4 photocatalyst, cheap chemical material urea is taken as a reactant source, sodium tetraphenylborate is taken as a doping source, PEI (polyethyleneimine) is taken as a surface charge modifier, and the B-doped g-C3N4 photocatalyst is successively prepared with a pyrolysis and polymerization method easy to operate. The nonmetal liquid-phase doping modified g-C3N4 photocatalyst has novel organization structure appearance, good response of visible light with wavelength larger than 420 nm and good photocatalytic hydrogen generation property, and promotes solar energy conversion into new energy under the photocatalysis action at a low cost; the provided preparation method has the advantages of cheap raw materials, simple and convenient technology and the like and has an important research value and a wide industrialized application prospect.

The invention discloses a method for measuring potassium by the sodium tetraphenylborate turbidimetry and a masking agent which is used by the method. The masking agent is a water solution containing 0.01 to 0.04mol / l of Cu<2+>, 0.04 to 0.10mol / l of tartaric acid and 5 to 10mol / l of H<+>; the method for measuring the potassium by the sodium tetraphenylborate turbidimetry is that: the masking agent is used for masking ammonium ion and other interfering ions in liquid under test, basic EDTA disodium salt solution is further added to carry out the auxiliary masking, basic sodium tetraphenylborate water solution is finally added, and the turbidity measurement is immediately carried out after shaking the reaction solution well. The measurement method has the advantages of simple operation, rapid and accurate measurement and low cost; the linear range thereof meets the requirements of the rapid measurement, which is suitable for the application of grass roots and agriculture popularization departments; and the masking agent used does extremely small harm to the human body and the environment.

The present invention discloses to an organic and inorganic compound fertilizer special for promoting growth and improving disease resistance of lotus roots. The compound fertilizer is prepared from fermented chicken manure, wheat straw, mushroom residue, plant ash, wormcast, urea, ammonium zinc phosphate, ammonium polyphosphate, potassium nitrate, trace elements, compound bacteria, humic acid, chitosan, alginic acid, 3, 4-dimethylpyrazole phosphate, sodium tetraphenylborate, ammonium citrate, potassium thiosulfate, polyaspartic acid, dicyandiamide, sodium nitrophenolate, yttrium nitrate, nanocarbon, rotenone and sucrase. The compound fertilizer is reasonable in formula, balanced in nutrition, capable of promoting the growth of the lotus roots and improving disease resistance of the lotus roots at the same time, and high in fertilizer utilization rate.

The invention relates to a fluorescent labeled organic boron / nitrogen Lewis acid and base bifunctional catalyst and a preparation method thereof. The catalyst is characterized by being prepared by the following step: by taking a quinoline amide compound and a cheap sodium tetraphenylborate derivative as raw materials, cheap and easily available single element iodine as a catalyst and a common organic solvent as a reaction solvent, performing a reaction for a while at a certain temperature to obtain the bifunctional organic boron / nitrogen Lewis acid and base catalyst with a high yield and high selectivity. The catalyst is good in stability and recyclable, and has very good diastereoselectivity in a Mannich reaction. The method has the advantage s of being relatively low in cost, high in yield, simple and convenient to operate, pollution-free and the like, and has certain feasibility for realizing industrial production.

The invention provides a stable HRP (Horseradish Peroxidase) enzyme-catalyzed chemiluminescence substrate solution as well as a preparation method and application thereof. Typically, the stable HRP enzyme-catalyzed chemiluminescence substrate solution is prepared from two components including a chemiluminescence substrate solution A and a chemiluminescence substrate solution B, wherein the solution A is prepared from luminol, p-imidazophenol, sodium tetraphenylborate, dimethylformamide (DMF), sulfobutyl-beta-cyclodextrin, a light stabilizer and a Tris buffering solution with a certain concentration; and the solution B is prepared from polyvinylpyrrolidone (PVP), urea peroxide and the Tris buffering solution. With the adoption of the chemiluminescence substrate solution provided by the invention, the problems of an existing chemiluminescence substrate that the platform phase is short, the stability is relatively poor, the luminous intensity is low, the sensitivity is low and the background is relatively high can be solved.

The invention relates to a preparation method of a catalyst for synthesizing propionic acid by ethanol carbonylation, and an application of the catalyst. The catalyst is prepared by the following steps of: taking 2-vinyl pyridine and acraldehyde as monomers, benzene as a solvent and azodiisobutyronitrile as an initiator; adopting a free-radical solution polymerization method, and using petroleum ether for precipitation; carrying out vacuum drying to be at constant weight at the temperature of 60-80 DEG C to obtain a catalyst ligand; dissolving the obtained catalyst ligand in acetic acid, adding dichloro-tetracarbonyl-dirhodium, and carrying out reaction for 10-30min; and adding a precipitator (sodium tetraphenylborate), and continuously stirring for 5-20min to obtain a copolymer rhodium catalyst. The catalyst can be used for catalyzing ethanol carbonylation to synthesize the propionic acid with high selectivity.

The invention provides a method for detecting potassium ions by using a surface-enhanced Raman scattering(SERS) technology and belongs to the technical field of detection of the potassium ions. The method comprises the following steps: firstly, preparing an SERS substrate with a light spectrum enhancing capability; then, adsorbing a sodium cobaltinitrite or sodium tetraphenylborate reagent on the SERS substrate respectively; dropwise adding potassium ion solution to be detected on the surface of the substrate, and detecting an SERS light spectrum of a reaction product by using a Raman spectrometer; and finally, comparing the SERS light spectrum with a working curve to obtain the potassium ion concentration of the solution to be detected. The method provided by the invention has the characteristics of moderate detection conditions, simplicity, rapid detection process and accurate detection result; and the method has important application in the field of the detection of the potassium ions, and can be used for quantitatively analyzing the potassium ions.

The invention discloses an electrolyte with a high solvent-sodium salt ratio and a sodium ion battery. The electrolyte comprises sodium salt, a solvent and an additive, wherein the molar ratio of the solvent to the sodium salt is (20: 1)-(70: 1), and the addition amount of the additive accounts for 0.5%-5% of the mass of the electrolyte; the sodium salt comprises one or more of sodium perchlorate (NaClO4), sodium tetrafluoroborate (NaBF4), sodium hexafluorophosphate (NaPF6), sodium hexafluoroarsenate (NaAsF6), sodium trifluoroacetate (CF3COONa), sodium tetraphenylborate (NaB(C6H5)4), sodium trifluoromethanesulfonate (NaSO3CF3), sodium bis (fluorosulfonyl) imide (Na[(FSO2)2N]) or sodium bis (trifluoromethanesulfonyl) imide (Na[(CF3SO2)2N]).

The invention discloses a method for detecting the ionic calcium content of a blood sample, and belongs to the field of calcium ion detection. The method comprises the following steps: by adopting polytetrafluoroethylene, synthetic plant ester, sodium tetraphenylborate, laurate, N-butyl pyridine calcium hexafluorophosphate and N,N,N',N'-tetracyclohexyl-3-oxa-glutaramide as solutes, reacting with a solvent tetrahydrofuran to prepare a calcium ion sensing membrane, and filling the calcium ion sensing membrane on a glassy carbon electrode substrate to obtain a calcium ion selective electrode; and measuring the ionic calcium content of the blood sample by using an ion selective electrode method which is used for a self-made calcium ion selective electrode. The method disclosed by the invention can be used for rapidly measuring the calcium ion content of the blood sample, and is high in measurement accuracy, good in stability, high in specificity, simple in measurement step and low in test cost.

An anti-tumor activated ferric complex and preparation method thereof relate to complex preparation technique field. Dipyridylmethyl amine and 2-chrolomethylpyridine are used as materials, and react under the temperature condition of 20-80 DEG C for 1-3hours in acetonitrile solution according to 1:1 molar ratio between dipyridylmethyl amine and 2-chrolomethylpyridine, to prepare tripyridylmethyl amine (ligand L), then the combined tripyridylmethyl amine (L) is mixed with ferric trichroride and sodium tetraphenylborate in methanol solution and the molar ratio of tripyridylmethyl amine: ferric trichroride: sodium tetraphenylborate is 1: 1: 1, and stirred under the condition of 20-60 DEG C for 0.5-2 hours, finally oxygen-bridged dinuclear Fe(III) complex is synthesized : [LFeClOFeClOL]BPh4. The novel Fe (III) complex synthesized by the invention has excellent inhibitory effect to liver cancer.

The invention discloses an organic multi-component carrier lead ion selective electrode and a preparation method thereof. The organic multi-component carrier lead ion selective electrode comprises a selective film, a polrvinyl chloride pipe, an Ag / AgCl internal reference electrode, internal filled liquid and an electrode lead. The preparation method is characterized by comprising the following steps of: sufficiently mixing macrocyclic compounds such as calixarene, tetraphenylporphyrin and 18-crown ether-6 and organic matters containing soft active atoms (O, S, P), such as triphenylphosphine and dimethyl sulfide, to prepare a physical blending carrier; and dissolving the blending carrier, polrvinyl chloride powder, dibutyl phthalate and sodium tetraphenylborate into tetrahydrofuran, and carrying out ultrasonic dispersion to obtain a lead ion selective film. The purpose of carrier modification is achieved through physical mixing, so that the property of the lead ion selective electrode is extremely high, and the carrier is avoided being subjected to chemical modification with a complicated chemical synthesis process and a large quantity of organic reagents. The organic multi-component carrier lead ion selective electrode has the advantages of simple manufacturing, Nernst response, good selectivity and high stability and can be used for quickly and accurately detecting lead ions in a solution.

The invention discloses effect improved compound fertilizer. The effect improved compound fertilizer comprises, by part, 35-65.2 parts of urea with 46 percent of N, 8-40 parts of monoammonium phosphate with 10 percent of N and 50 percent of P2O5, 6.7-30 parts of potassium chloride with 60 percent of K2O or 8-30 parts of potassium sulphate with 50 percent of K2O, 0-15 parts of ammonium sulfate with 21 percent of N and 0.1-1 part of nitrogen controlled synergist (AHE). According to the AHE, the proportion of sodium tetraphenylborate, copper sulfate, zinc oxide, ammonium citrate and potassium thiosulfate is 3: 2: 2: 1: 2-3. The effect improved compound fertilizer reduces the hydrolysis rate of urea in the fertilizer, restrains the activity of nitrobacteria in soil, the 6-8 millesimal of AHE is added into the effect improved compound fertilizer, the nitrogen use efficiency reaches to 44 percent, the nitrogen use efficiency is improved by 23 percent, the nitrogen loss is reduced by 22.6 percent, and the crop is increased by 8-16 percent. One-time fertilize application is carried out in spring, and labor cost is saved.

The invention belongs to a technology for simultaneously determining the content of two different effective components in a disinfectant, and concretely relates to a method for simultaneously determining the content of ethylene glycol phenyl ether and quaternary ammonium salt in the disinfectant. The determination method is characterized in that high-performance liquid chromatography is adopted to determine ethylene glycol phenyl ether in the disinfectant, ethylene glycol phenyl ether has ultraviolet absorption at 254[mu]m, reversed-phase high performance liquid chromatography (HPLC) is used to separate, qualitative analysis is carried out through using the retention time and an ultraviolet spectrogram, the peak area is used to quantify, and the mass fraction of ethylene glycol phenyl ether in the disinfectant is calculated according to a formula; and the quaternary ammonium salt and bromophenol blue and other acidic dyes form a colored salt in order to determine the content of the quaternary ammonium salt, and the colored salt can be easily extracted by a chlorine-containing organic solvent in an alkaline aqueous solution, and the combination of the colored salt is less stable than combination of sodium tetraphenylborate and the quaternary ammonium salt, so the property of the colored salt is used as the principle of the indicator sodium tetraphenylborate for titrating the quaternary ammonium salt, and the content of the quaternary ammonium salt in the disinfectant can be obtained through recording the titration amount of sodium tetraphenylborate and calculating according to a formula.

The invention provides a diffusion dialysis device for recycling NH4<+> from coking wastewater, and a method for treating the coking wastewater and other high-concentration ammonia nitrogen wastewater and recycling the NH4<+> by using the device. The economic feasibility and technical feasibility of the treatment method are fully considered, the high-concentration NH4<+> in the coking wastewater is subjected to the combined technology of membrane diffusion dialysis separation and sodium tetraphenylborate selective precipitation, the aim of removing and recycling NH4<+> from the coking wastewater containing high-concentration ammonia nitrogen and other high-concentration ammonia nitrogen wastewater is achieved, the removal rate of the NH4<+> can be over 95 percent, and the recycling rate of the NH4<+> can be over 90 percent.

The invention provides a polymer fluorescent nanometer particle. The polymer fluorescent nanometer particle is applied to liquid crystal display devices, and comprises a polymer nanometer particle, and rhodamine dye and hydrophilic-lipophilic balancing matter loaded on the polymer nanometer particle, wherein the polymer nanometer particle, the rhodamine dye and the hydrophilic-lipophilic balancingmatter are combined into a whole through electrostatic attraction; the hydrophilic-lipophilic balancing matter comprises at least one in perchlorate, sodium tetraphenylborate, sodium tetrakis (4-fluorophenyl) borate dihydrate and trityl tetrakis (pentafluorophenyl) borate. The polymer fluorescent nanometer particle can absorb yellow-orange light and emit red light, can be applied to liquid crystal display devices, so as to reduce interference of yellow-orange parasitic light and enhance the color gamut, and meanwhile emit red light to guarantee invariability of lightness; meanwhile the rhodamine dye is loaded on the polymer fluorescent nanometer particle, can avoid agglomeration of the rhodamine dye, improves the absorption efficiency and fluorescence efficiency, and the polymer fluorescent nanometer particle has a wide application prospect to the liquid crystal display devices.

The invention belongs to the technical field of electro-catalysis and energy materials, and particularly relates to a porous nitrogen-boron co-doped carbon-based oxygen reduction catalyst and a preparation method and application thereof. The method comprises the following steps: 1) obtaining a mixed raw material, wherein the raw material comprises a nitrogen-containing carbon precursor and sodiumtetraphenylborate; 2) performing solid-phase synthesis on the raw material obtained in the step 1) to obtain a crude product; and 3) cleaning the crude product obtained in the step 2) to obtain the porous nitrogen-boron co-doped carbon-based oxygen reduction catalyst. According to the technical scheme, sodium tetraphenylborate is used as a raw material, sodium tetraphenylborate is used as a boronsource precursor and can also be used as a pore-forming agent, and the nitrogen-boron co-doped material with a porous structure can be obtained by using a simple solid-phase synthesis method.

The invention discloses a novel racemized chiral organic boron-nitride fluorescent compound and a preparation method thereof. The compound is characterized in that quinoline amide compounds, cheap sodium tetraphenylborate ramifications and carboxylic ramifications are adopted as raw materials, and molecular iodine which is low in price and easy to obtain serves as a catalyst; common organic solvents are adopted as reaction solvents, the reaction is conducted at a certain temperature for a certain time, and then the novel racemized chiral organic boron-nitride fluorescent compound is obtained in a high production rate and a high selectivity. The catalyst is great in stability and recoverable, and has an excellent non-correspondence isomerism selectivity in condensation reactions of aldehyde ketone. The preparation method has the advantages of being low in cost, high in production rate, simple to operate, free of pollution and the like, and has a certain feasibility in implementation of industrialized production.

The embodiment of the invention relates to a soft carbon-coated boron-doped silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material is a powder material, and the powder conductivity is 2.0 S / cm to 6.0 S / cm; the soft carbon-coated boron-doped silicon-based negative electrode material comprises the following components in percentage by weight: 90wt%-99.49 wt% of a silicon-based powder material, 0.01 wt%-3wt% of a doping material doped in the silicon-based powder material and 0.5 wt%-7wt% of a soft carbon material; the silicon-based powder material is specifically a powder material containing electrochemical activity and comprises one or more of a nano silicon-carbon composite material, silicon monoxide, modified silicon monoxide, doped silicon monoxide and amorphous silicon alloy; the doping material comprises one or more of titanium boride, boron nitride, boron trichloride, boric acid, diboron trioxide, sodium tetraphenylborate, sodium borohydride and sodium borate; and the soft carbon material is coated on the outer surface of the silicon-based powder material to form a coating carbon layer of the boron-doped silicon-based negative electrode material.

The invention discloses a preparation method of an organic boron-nitrogen fluorescent compound. The preparation method comprises the following steps of: adopting a quinoline amide compound, cheap sodium-tetraphenylborate type derivatives and carboxylic-acid type derivatives as raw materials, adopting cheap copper bromide or sodium bromide as a catalyst, adopting a common organic solvent as a reaction solvent, reacting for a period of time under a certain temperature, and obtaining a novel chiral organic boron-nitrogen fluorescent compound by high yield and high selectivity. The organic boron-nitrogen fluorescent compound is good in stability, can be recovered, has very good diastereoisomeric selectivity in aldehyde-ketone condensation reaction. The preparation method disclosed by the invention has the advantages of lower cost, high yield, simple operation and no pollution and the like, and has certain feasibility for realizing industrial production.

The invention provides a method for detecting a potassium salt in cow milk. The method comprises the following steps of mixing 19.45mL of a disodium hydrogen phosphate solution with a concentration of 0.2mol / L, 0.55mL of a citric acid solution with a concentration of 0.1mol / L and 1.32g of sodium tetraphenylborate, dissolving the mixture by distilled water to obtain 100mL of a sodium tetraphenylborate buffer, taking 5mL of cow milk to be detected, dropwisely adding an acid solution into the cow milk, carrying out mixing to obtain a uniform solution, carrying out centrifugation after condensation, collecting the supernatant A, taking 0.5mL of the supernatant A, adding 0.7mL of the sodium tetraphenylborate buffer into the supernatant A, carrying out mixing to obtain a uniform mixture, carrying out centrifugation, collecting the supernatant B, taking 1mL of the supernatant B, adding 0.3mL of the sodium tetraphenylborate buffer into the supernatant B, carrying out mixing to obtain a uniform mixed solution, carrying out observation, wherein if the mixed solution is clear and transparent, the tested cow milk does not contain the potassium salt, and if the mixed solution produces a lot of white precipitates, the tested cow milk contains the potassium salt. The method can be operated simply and has a low detection cost.

The invention discloses a preparation method of borphenyl pyridine. The method comprises the following steps: A, preparing phenylmagnesium chloride; B, synthesizing tetraphenyl boric magnesium chloride; C, synthesizing sodium tetraphenylborate; D, synthesizing pyridine hydrochloride; E, synthesizing tetrapheny boron pyridine; and F, synthesizing the borphenyl pyridine. The synthesizing diagram is shown in the specification. The method can be used for easily preparing a final product with high purity and good yield. The method has the characteristics of being simple in process, low in cost and high in product purity.

The invention discloses a sodium tetraphenylborate-based enantiomer potential sensor and an application of the enantiomer potential sensor in detection of valinemethyl ester. The sodium tetraphenylborate-based enantiomer potential sensor is characterized in that sodium tetraphenylborate, a plasticizer and PVC are dissolved in tetrahydrofuran to prepare a PVC membrane, a step of air drying is carried out, one sheet of the PVC membrane is sliced to paste on one end of a PVC pipe, a filling liquid is injected in the pipe, an Ag / AgCl internal reference electrode is inserted to obtain a PVC membrane electrode, and the membrane electrode forms the enantiomer potential sensor with a calomel electrode. The enantiomer potential sensor is used for detecting a leucinemethyl ester enantiomer. According to the invention, the linearity range is 10<-4>-10<-1> mol<-1>, the slope is -47mV dec<-1>, the LOD(limit of detection) is 3.311*10<-4> mol L<-1>, the electrode enables chiral detection on valinemethyl ester, and the antipodal selective coefficient 1g(img file='DDA0000439081610000011.TIF' wi='160' he='71' / ) is -2.36. The sodium tetraphenylborate-based enantiomer potential sensor and the application of the enantiomer potential sensor in detection of valinemethyl ester have the advantages of rapidity, economy, environmental protection, simple equipment and convenient operation, and can be used for on-site determination.

The invention provides a method for detecting a cationic degree of a synthetic polymer for drilling fluid. The method includes: purifying a cationic polymer sample by ethanol solution, and dissolvingthe purified sample in sodium chloride water solution to obtain sample water solution; controlling apparent viscosity of 1wt% of the sample water solution to be smaller than or equal to 10mPa s; adopting a sodium tetraphenylborate back titration method for detecting to obtain the total content of quaternary ammonium salt cations and potassium ions; adopting an ashing method to detect to obtain thecontent of the potassium ions, calculating a difference value between the total content of quaternary ammonium salt cations and the potassium ions and the content of the potassium ions to obtain an actually measured cationic degree. Aiming at the defect of difficulty or low accuracy in cationic degree determination due to external interference and polymer molecular structural influences, the method for detecting the cationic degree of the synthetic polymer for drilling fluid is improved to achieve high accuracy and applicability.

The present invention relates to a poly(2-vinylpyridine)-b-poly(n-hexylisocyanate) amphiphilic coil-rod block copolymer and a polymerization method thereof, more particularly to a poly(2-vinylpyridine)-b-poly(n-hexylisocyanate) amphiphilic coil-rod block copolymer polymerized by a process comprising synthesizing poly(2-vinylpyridine) having a narrow molecular weight distribution by living polymerization using potassium diphenylmethane (K-DPM) as initiator, adding sodium tetraphenylborate (NaBPh4) to replace the counter cation with a sodium ion (Na+) and adding n-hexylisocyanate and performing polymerization and a polymerization method thereof. According to the present invention, it is possible to control the molecular weight and the structure of each block of the copolymer. Therefore, coil-rod type amphiphilic block copolymers having a variety of structures can be obtained. The resultant block copolymer is a useful optical polymer material.

The invention discloses a determination method for K<2>O content in the production of potassium dichromate, comprising the following steps of: taking V of the potassium dichromat reaction liquid to bedetected, adding reducing agents to reduce the hexavalent chromium to trivalent chromium under acidic conditions, adding alkali to neutralize until the solution is neutral, keeping the temperature at90-100 DEG C for 1-2 h, filtering and washing to be free of K<+>, and collecting the washing solution; heating the obtained washing solution to boiling, adding sodium tetraphenylborate solution dropwise under stirring to generate potassium tetraphenylborate precipitates, and cooling and standing; transferring the cooled solution obtained in the step 2 to a G4 glass sand core hopper dried to a constant weight at 120 DEG C to carry out the suction filtration, washing the obtained precipitations with the potassium tetraphenylborate solution, and finally placing into a dryer to dry to the constant weight W; and calculating the K<2>O content as A = 0.1314W1000 / V.

The invention discloses a surface-enhanced Raman scattering method for controlling the catalytic activity of a graphene oxide nanoribbon by using a sodium tetraphenylborate ligand to measure K<+>. The method is characterized by comprising the following steps: (1) preparing a K<+> standard solution system with known concentration; (2) preparing a bank control solution system; (3) calculating deltaI=I-I0; (4) making a work curve for a concentration relationship of the K<+> by using deltaI; (5) calculating deltaIsample=Isample-I0; and (6) calculating the content of the K<+> of the sample solution according to the work curve in the step (4). According to the measurement method, the catalytic activity of nano-enzyme is controlled by adopting the ligand and the method is simple, convenient, fast and high in sensitivity.

The invention discloses a resonance scattering spectrometry method for determining NH<4+> by using a sodium tetraphenylborate ligand for adjusting and controlling nano-silver catalytic activity. The method is characterized by comprising the following steps: (1) preparing a NH<4+> standard solution system with known concentration; (2) preparing a blank control solution system not containing NH<4+>; (3) calculating according to the equation that delta I is equal to I minus I0; (4) making a working curve according to a relationship between the delta I and NH<4+> concentration; (5) preparing a to-be-measured sample solution, determining the resonance scattering peak intensity value of the to-be-measured sample solution as an I sample, and calculating according to the equation that delta I sample is equal to I sample minus I0; (6) calculating out the NH<4+> content of the sample solution according to the working curve of step (4). The method of the invention uses the ligand for adjusting and controlling nano-enzyme catalytic activity, and is simple, convenient, quick and high in sensitivity.

The invention discloses a continuous determination method of a potassium nitrate and sodium nitrate mixed salt bath. The method provided by the invention comprises the following steps: preparing a sample solution, determining and calculating the content of potassium nitrate, determining and calculating sodium nitrate and the like. In the acidic medium of acetic acid, sodium tetraphenylborate reacts with potassium nitrate to produce a potassium tetraphenylborate precipitate, filtering, drying and weighing are carried out, and then the content of potassium nitrate is calculated; in the presence of molybdenum salt, a concentrated sulfuric acid is used to acidify, the nitrate reacts with excess ammonium ferrous sulfate standard solution, sodium diphenylamine sulfonate is used as an indicator, a potassium dichromate standard titration solution is used for back titration, the total amount of the nitrate is calculated according to the amounts of the ferrous ammonium sulfate and the potassium dichromate standard titration solution, and the amount of potassium nitrate equivalent to sodium nitrate is subtracted to obtain the content of sodium nitrate. The determination method provided by the invention has the advantages of simplicity, convenient detection process, quickness, environmental protection, low cost, and accurate and consistent detection result, and provides support for the maintenance and quality control of potassium nitrate and sodium nitrate.

The invention discloses a surface plasma resonance absorption spectrometry method for determining NH<4+> by using a sodium tetraphenylborate ligand for adjusting and controlling nano-silver catalytic activity. The method is characterized by comprising the following steps: (1) preparing a NH<4+> standard solution system with known concentration; (2) preparing a blank control solution system; (3) calculating according to the equation that delta A is equal to A minus A0; (4) making a working curve according to a relationship between the delta A and NH<4+> concentration; (5) preparing a to-be-measured sample solution, determining the resonance scattering peak intensity value of the to-be-measured sample solution as an A sample, and calculating according to the equation that delta A sample is equal to A sample minus A0; (6) calculating out the NH<4+> content of the sample solution according to the working curve. The method of the invention uses the ligand for adjusting and controlling nano-enzyme catalytic activity, and is simple, convenient, quick and high in sensitivity.

The invention relates to a high-selectivity cadmium ion selecting electrode and a preparation method thereof. A cadmium ion selecting electrode sensitive membrane is adhered to the lower end of a PVCpipe, the PVC pipe is filled with 10-3 mol L-1 of cadmium standard solution, an Ag / AgCl electrode is inserted to serve as an internal reference electrode and is covered by an electrode cap, a lead is drawn out, and the high-selectivity cadmium ion selecting electrode is prepared. Cadmium ion-imprinted polymer nano-spheres, polyvinyl chloride, dibutyl phthalate, and sodium tetraphenylborate are dissolved in an appropriate amount of tetrahydrofuran, and the above solution is poured onto a glass sheet to be dried naturally, and the cadmium ion selecting electrode sensitive membrane is obtained.The core-shell type cadmium ion imprinted polymer micro / nano-spheres are applied to an analysis technology of the ion selecting electrode (ISE) for the first time, the functions of the ion selectingelectrode are further enhanced and improved, the performance is further improved, the electrode is more sensitive and reliable, the prepared ion selecting electrode has high selectivity, long servicelife, fast response and high sensitivity and can fast and accurately detect cadmium ions in the solution.