37results about How to "Suitable for determination" patented technology

The invention discloses an analysis and detection method for impurity elements such as aluminum, calcium, ion, molybdenum, niobium, titanium, tungsten and the like in chromium carbide. The method comprises adding a chromium carbide sample into a dissolving cup, adding hydrofluoric acid, sulphuric acid and nitric acid sequentially, stirring, charging into a sealed high-pressure jar; putting the sealed high-pressure jar into a microwave extinguishing instrument for two times of microwave extinguishment; taking the high-pressure jar out of the microwave extinguishing instrument for cooling, transferring the dissolved chromium carbide liquid sample into a volumeric flask, diluting to a predetermined index, stirring; preparing a chromium substrate matched mixed standard solution series of aluminum, calcium, iron, molybdenum, niobium, titanium and tungsten; measuring element emission power of aluminum, calcium, iron, molybdenum, niobium, titanium, tungsten or the like in a blank liquid sample, a chromium carbide liquid sample and the prepared series mixed standard solution by an inductively coupled plasma atomic emission spectrometer in the same time, obtaining the analysis result by checking a standard working curve or by linear equation calculation. The invention adopts two times of microwave extinguishment using the mixed acid, solves the problem of hardness in chromium carbide decomposition, having a measurement range from 0.010% to 1.00%, which is high in accuracy, and good in precision.

The invention relates to a rapid detection method for SBS modified asphalt modifier contents. The method comprises the steps that comparison SBS modified asphalt samples are constituted into a calibration set, and infrared spectroscopy data of the comparison SBS modified asphalt samples are collected; SBS content data in the comparison SBS modified asphalt samples and the infrared spectroscopy data of the comparison SBS modified asphalt samples are subjected to regression analysis with a chemometrics method, and a multivariate calibration model of the SBS contents in the comparison SBS modified asphalt samples is built; the SBS contents in to-be-tested SBS modified asphalt samples are obtained by combining the infrared spectroscopy data of the to-be-tested SBS modified asphalt samples and the multivariate calibration model, the rapid detection method for the SBS modified asphalt modifier contents can be applied in site quality control and supervision work for SBS modified asphalt of quality supervision institutions and project construction units, and asphalt pavement construction quality control work can be effectively instructed.

The invention relates to the technical field of physical and chemical inspection of water-based glue and particularly relates to a method for determining three types of isothiazolinone preservatives in water-based glue by adopting a liquid chromatography-tandem mass spectrum. A water-based glue sample is extracted with water and centrifuged, then is subjected to LC-MS / MS analysis and is quantified by an internal standard method. The concentration range of 2-methyl-4-isothiazolin-3-ketone (MI) and 5-chloro-2-methyl-isothiazolin-3-ketone (CMI) is 2.5ng / mL-250ng / mL, the concentration range of 1,2-benzisothiazol-3(2H)-ketone (BIT) is 5ng / mL-500ng / mL, the linear relation is good (R2 is more than or equal to 0.9996), the adding standard recovery rates of three adding levels are 96.3%-109.6%, the average relative standard deviation (RSD) is 1.5%-6.7%, and the limit of detection (LOD) and the limit of quantification (LOQ) of the method are 0.011mg / kg-0.015mg / kg and 0.035mg / kg-0.051mg / kg. The method is simple to operate, has high sensitivity and good repeatability, and is suitable for rapidly determining MI, CMI and BIT in the water-based glue.

The invention provides a solid sample carrying stage for a spectrophotometer. The solid sample carrying stage comprises an adjusting seat and a moving frame, wherein the adjusting seat is L-shaped, and comprises a base part and an arm part, the base part is provided with a groove, a first guide rail groove is formed in the base part, and a screw hole and an ejector pin through hole are formed in the arm part; the moving frame is U-shaped, comprises a base connecting part, a first arm part and a second arm part; the base connecting part is embedded in the groove of the base part of the adjusting seat, a second guide rail groove is formed in the base connecting part, the first guide rail groove is matched with the second guide rail groove to form a complete guide rail groove and a guide rail is embedded in the complete guide rail groove, clamping grooves are formed in the upper sides of the first arm part and the base connecting part, and a through hole and an ejector pin through hole are formed in the second arm part; and a moving knob is in threaded connection with the screw hole of the arm part and penetrates through the screw hole and the through hole of the second arm part, and the ejector pin penetrates through the ejector pin through hole of the arm part and the ejector pin through hole of the second arm part. The invention further provides a corresponding LSPR detection method. The solid sample carrying stage and the LSPR detection method provided by the invention are very convenient for high-flux detection and suitable for measuring a sample with a small width.

The invention discloses a method for measuring solvent compositions in nicotine liquid by combining gas chromatography and mass spectrometry. The method comprises the following steps of preparing a series of standard solutions simultaneously containing ethanol, 1,2-propylene glycol, glycerin, diethylene glycol, triethylene glycol, tetraethylene glycol and pentaethylene glycol by taking a methanol solution of 1,3-butylene glycol as an internal standard solution which serves as a solvent, detecting the series of standard solutions by utilizing gas chromatography-mass spectrometer, and establishing a standard curve; pre-treating the nicotine liquid to obtain a sample solution to be detected, detecting the sample solution to be detected by utilizing the gas chromatography-mass spectrometer, and calculating the solvent compositions in the nicotine liquid according to the corresponding standard curve. According to the method, ethanol, 1,2-propylene glycol, glycerin, diethylene glycol, triethylene glycol, tetraethylene glycol and pentaethylene glycol in a smokeless tobacco product can be simultaneously detected, and the method is easy to operate and high in sensitivity and reproducibility.

The invention belongs to the technical field of Roman spectrum analysis and develops a microscope heat state device used for measuring gas solubility in a high-temperature molten salt system on the basis of the Roman spectroscopy. The microscope heat stage device comprises a heat stage furnace and a heat stage reactor; the heat stage furnace comprises a heat stage furnace shell, more than two silicon carbide rods, stainless steel clamps and power lines; the heat stage reactor comprises a heat stage reaction base, a heat stage reactor flange cover, a heat stage screw piston, a sample pool and a quartz observation tablet. A sealed quartz window is arranged in the upper portion of the sample pool, volatile of high-temperature molten salt is prevented from polluting the surface of a lens, and Roman incident laser is ensured to pass through the quartz observation window; the heat stage reaction is cooled through water path circulation of the heat stage reaction flange cover, and temperature nearby the microscope heat stage is ensured not to be so high; the microscope lens is close to the surface of the sample pool, which is suitable for detection of the micro-Raman spectrum; the silicon carbide rods are long and far from cold ends of the silicon carbide rods, even heating of a crucible is guaranteed, and temperature gradient in the sample pool is decreased.

The invention provides a method for testing zirconia in zirconia-coated nickel-cobalt-manganese ternary positive electrode materials, which can solve the technical problems of many interference factors and large errors in the existing method. The present invention uses hydrofluoric acid and nitric acid to dissolve the nickel-cobalt-manganese ternary positive electrode material sample, heats and dissolves on the electric heating plate, then adds cesium chloride to the sample solution, and transfers the sample solution at constant volume to a separatory funnel to add The n-hexane solution containing 55% trimethyl phosphate is extracted and separated, and the separated organic phase solution is used as the sample to be tested; the present invention selects 1.5% cesium chloride solution to suppress zirconium under the high temperature of nitrous oxide-acetylene flame Ionization improves the test sensitivity of zirconium. Using n-hexane solution containing 55% trimethyl phosphate to extract, according to the different binding abilities of various metals and extractants, separate the main metal and zirconium metal ions, and change the type of anion, thereby reducing the nickel-cobalt-manganese ternary positive electrode material. The main metal of nickel, cobalt and manganese interferes with the test of zirconium metal, improving the test accuracy.

The invention discloses a carbon monoxide detecting agent and a preparation method thereof, and belongs to the technical field of gas detection. The carbon monoxide detecting agent comprises the following components in parts by weight: 15 to 50 parts of iodine pentoxide, 2 to 10 parts of hyposulphite, 2 to 5 parts of ammonium molybdate, 3 to 8 parts of concentrated nitric acid, 2 to 6 parts of yttrium nitrate, 2 to 6 parts of potassium nitrate, and 5 to 16 parts of water. The carbon monoxide detecting agent provided by the invention has the characteristics of high reaction rate and high sensitivity; a detecting method is simple; the carbon monoxide detecting agent is suitable for determining the content of CO in air in different environments.

The invention relates to a residual stress test method for a heat-resistant steel tube used for an ultra-supercritical boiler. The residual stress test method comprises the following steps that a coupling device is arranged by using a transmitting polarization wave probe, and the coupling device can be coupled with the external surface of the steel tube and the probe can be firmly fixed; and ultrasonic incident waves with frequency F are introduced to the surface of the steel tube, the excitation angle of the ultrasonic incident waves is adjusted, the amplitude of incident and emergent waves is measured by using a detector, and residual stress is determined through reckoning according to incident time, emergent time and the frequency / wavelength, wherein the heat-resistant steel tube is an austenitic heat-resistant steel tube, and the ultrasonic frequency F is 51-54MHz. Lossless determination suitable for the steel tube with curvature can be performed by the method.