39 results about "Amperometric detector" patented technology

The invention discloses a device and a method for detecting total cyanide and sulfide in a water solution by employing direct conversion. The method comprises the following steps: feeding a sample solution of which the pH is greater than or equal to 11 into a six-way valve quantitative loop to quantify through an online filter, feeding excessive sample solution into a liquid waste bottle; switching a six-way valve, pumping a pure water solvent as a carrying current, pushing out the sample solution, and pumping a water solution containing a stabilizer and an exchanger in advance; after mixing with the sample coming from quantitative loop samples, switching a three-way valve, and refluxing into a storage bottle, further pushing the solution to be mixed evenly in a mixing pipe by virtue of the pure water solvent; entering a photolysis device to carry out photolysis until reaching a capture column in the six-way valve in an ion chromatograph; locking a to-be-detected object, feeding a non-to-be-detected object into the liquid waste bottle; rising the capture column by using an eluting solution, and entering a separation post; sequentially discharging the sulfide and cyanide; and respectively detecting the sulfide and the cyanide by virtue of an ampere detector, and then rinsing the separation column in a reinforcing manner. Compared with an existing national standard method, the method disclosed by the invention is green, safe, environment-friendly, and little in interference; the analysis time, the laboratory safety and the cost are obviously improved; and use of a toxic reagent is also reduced.

The invention relates to a method for measuring hydrogen sulfide in mainstream cigarette smoke, in particular to an ion chromatography method for measuring hydrogen sulfide in mainstream cigarette smoke. The invention provides a method for directly measuring hydrogen sulfide in mainstream cigarette smoke, in order to solve the problem that complete capture and derivatization indirect measurement of hydrogen sulfide in mainstream cigarette smoke are susceptible to interference in prior arts. In the inventive method, an alkaline solution containing ascorbic acid, zinc acetate, ethylenediamine and sodium hydroxide is adopted to capture hydrogen sulfide in the gas phase of cigarette smoke, and anion exchange chromatographic separation and silver working electrode-equipped pulsed amperometric detector are adopted to directly measure hydrogen sulfide (sulfur ions) in the mainstream cigarette smoke. Compared with a conventional method, the inventive method has simpler operation, higher safety and higher interference resistance.

The invention discloses a method for detecting total cyanide and sulfide through online photolysis-noncontact diffusion-chromatographic separation. The method mainly comprises the following steps: in a flowing injection system, absorbing a sample into an acid solution flow to be conveyed into a photolysis device for photolysis so that cyanide in different forms is turned into hydrogen cyanide and sulfide is turned into hydrogen sulfide, passing the solution through an acid canal of a gas-liquid membrane separation diffusion unit to be diffused into an alkali canal on the other side through a hydrophobic membrane in a noncontact manner; keeping the cyanide and the sulfide diffused in an alkaline absorbing solution; by alternately switching a second six-way valve and a third six-way valve, driving a matter to be detected in a buffer pipe through a water solution in an injection pump, trapping the matter to be detected in the buffer pipe through a trapping column in the third six-way valve and locking the matter to be detected; washing the trapping column through leacheate, entering a separation column, discharging the cyanide and the sulfide sequentially and detecting one by one through an ampere detector. The method disclosed by the invention is short in detection time, light in interference, sealed in process, high in sensitivity, low in damage on member, mild in condition and environmental friendly.

The invention belongs to a radiation detection device, in particular relates to a current type cadmium zinc telluride (CZT) detector with a compression joint structure and solves the technical problems of poor packaging structure of the CZT detector under the limited process and technical conditions, increase of leakage current, infirmness of electrodes, high preparation difficulty, instable performance, low customized product processing rate and the like of the packaged CZT detector. The current type CZT detector comprises a shielding shell, two cable adapters which are arranged outside the shielding shell, a through hole which is formed in the shielding shell, and a CZT crystal, conductive gasket rings, the electrodes and pressing covers, which are arranged in the through hole, wherein conductive layers are coated on the surface of two sides of the CZT crystal; the conductive gasket rings, the electrodes and the pressing covers are divided into two groups and symmetrically distributed on the two sides of the CZT crystal; the conductive gasket rings are respectively contacted with the two sides of the CZT crystal; the electrodes are contacted with the corresponding conductive gasket rings; and the pressing covers are used for fixing the electrodes and the conductive gasket rings into the shielding shell and pressed against the CZT crystal. The current type CZT detector is high in detection efficiency and detection sensitivity, and stable and reliable in performance.

The present invention provides a capillary electrophoresis-thermal working electrode-ampere detecting device and a method of producing the thermal working electrode. The device comprises a high-voltage separation system, an electrochemical detecting pool, a high-voltage power source earth terminal arranged in the detecting pool, an auxiliary electrode, a reference electrode and a thermal working electrode connected with an electrochemical analytical instrument, a platinum wire of the thermal working electrode connected with an end of a separation capillary and a heating element arranged on the platinum wire. Wherein, the electrochemical analytical instrument is connected with a computer workstation. Method of producing the thermal working electrode includes steps below: producing a heating circuit and a detecting terminal on the platinum wire, connecting the platinum wire with the separation capillary, etc. The present invention integrates the capillary electrophoresis, the thermal working electrode and the ampere detector into a whole device, thus expanding scope of detecting substance and improving repeatability, stability and reliability of connection between the separation capillary and the electrode. The device has the advantages of small size and easy arrangement and effectively avoids electrochemical detecting signals being interfered by heating current. The electrode has the advantages of simple production, easy utilization and high stability.

The invention discloses a device and a method for detecting total cyanide and sulfide in a water solution by employing direct conversion. The method comprises the following steps: feeding a sample solution of which the pH is greater than or equal to 11 into a six-way valve quantitative loop to quantify through an online filter, feeding excessive sample solution into a liquid waste bottle; switching a six-way valve, pumping a pure water solvent as a carrying current, pushing out the sample solution, and pumping a water solution containing a stabilizer and an exchanger in advance; after mixing with the sample coming from quantitative loop samples, switching a three-way valve, and refluxing into a storage bottle, further pushing the solution to be mixed evenly in a mixing pipe by virtue of the pure water solvent; entering a photolysis device to carry out photolysis until reaching a capture column in the six-way valve in an ion chromatograph; locking a to-be-detected object, feeding a non-to-be-detected object into the liquid waste bottle; rising the capture column by using an eluting solution, and entering a separation post; sequentially discharging the sulfide and cyanide; and respectively detecting the sulfide and the cyanide by virtue of an ampere detector, and then rinsing the separation column in a reinforcing manner. Compared with an existing national standard method, the method disclosed by the invention is green, safe, environment-friendly, and little in interference; the analysis time, the laboratory safety and the cost are obviously improved; and use of a toxic reagent is also reduced.

The invention discloses an online photolysis-non-contact diffusion-chromatographic separation method for detecting total cyanide and sulfide. Solution, so that different forms of cyanide into hydrogen cyanide, sulfide into hydrogen sulfide, flow through the acid channel of the gas-liquid membrane separation diffusion unit, non-contact diffusion through the hydrophobic membrane into the other side of the alkali channel; alkaline absorption The liquid will store the diffused cyanide and sulfide in it; through the alternate switching of the second and third six-way valves, the aqueous solution of the syringe pump drives the analyte in the buffer tube, so that the analyte in the buffer tube enters the trapping column in the third six-way valve , to lock the analyte; the eluent washes the trapping column, enters the separation column, cyanide and sulfide flow out in sequence, and are detected one by one by the amperometric detector. The invention has short detection time, less interference, airtight process, high sensitivity, little membrane damage, mild conditions and environmental protection.

The invention provides a method for measuring the content of plant polysaccharide, which comprises the following steps: degreasing a sample, removing small molecular compounds, performing reflux extraction with water, and performing microwave-assisted digestion to obtain plant polysaccharide hydrolysate. Monosaccharide in the hydrolysate is subjected to gradient elution through an ion exchange chromatographic column and a sodium hydroxide / sodium acetate solution and detected through a pulse ampere detector, the composition and content of monosaccharide generated by polysaccharide hydrolysis are measured, and the content of plant polysaccharide in the sample is calculated with the sum content of all monosaccharide as the standard. The method for measuring the content of the plant polysaccharide can effectively shorten the hydrolysis time of the plant polysaccharide, and then the content is measured by using the ion chromatography, so that a better choice is provided for the detection of the plant polysaccharide, and meanwhile, technical support and basic data are provided for controlling the quality of medicinal plants in plants and further researching the biological activity of the medicinal plants.

The invention relates to a method for identifying adulterated honey, which comprises the following steps: (1) sample pretreatment; (2) using an ion chromatography-pulse amperometric detector to determine whether the sample contains D-psicose; Described honey adulteration refers to mixing the syrup containing D-psicose in honey; The concrete method of step (2) is: the liquid to be tested is subjected to D-psicose by ion chromatography-pulse amperometric detection method. For separation and detection, the retention time is used to characterize D-psicose in the sample, and the external standard method is used to quantify D-psicose in the sample through the external standard curve method.

When analysing saccharides by HPAEC, the eluate from the column is typically analysed using a amperometric detector. According to the invention, amperometric detection is coupled with ultraviolet detection, with both methods being applied to the eluate. Thus the invention provides a method for analysing the eluate from a liquid chromatography column, wherein the eluate is analysed by both (a) amperometric detection and (b) ultraviolet detection. The information content derivable from using both sorts of detection advantageously exceeds that derivable from either of the two detection methods alone.

The invention discloses a device and a method for amperometric detection of the total cyanide and sulfide of wastewater by online photolysis dialysis / chromatographic separation. A first peristaltic pump pumps alkaline in a container into a receiving-liquid cavity channel of a dialysis cell, the excessive solution flows through a quantitative ring in an ion chromatograph, then flows into a waste-liquid bottle and then is stopped; a second peristaltic pump injects a fixed-volume sample solution containing a stabilizing agent and an exchange agent into a filter and a photolysis device continuously to reach a sample cavity channel of the dialysis cell, and after components to be detected are bilaterally balanced by membrane dialysis, the first peristaltic pump is started and conveys received liquid containing the total cyanide and the sulfide into a quantitative ring of a six-way valve in the ion chromatograph; by switching of the six-way valve, leacheate flows through the quantitative ring and is separated from a separating column by a protective column and is detected out by an amperometric detector. The device and the method disclosed by the invention have the advantages that under the mild alkaline condition, all cyanides are converted into alkaline-metal cyanides by narrow-spectrum ultraviolet photolysis, so that not only is the classic process of strong-acid distillation or acidified ultraviolet photolysis and then membrane separation omitted, but also almost no membrane pressure is generated in operation, and the sample treatment is simple.

An image forming apparatus has: an image supporting member; a charger in proximity to the image supporting member; a power source unit configured to apply charging voltages to the charger sequentially, the charging voltages including alternating voltages having different peak-to-peak voltages, respectively; an amperometric detector configured to detect values of alternating currents flowing in the charger during application of the charging voltages; and a processor configured to carry out a first charging voltage determination process or a second charging voltage determination process requiring a shorter time than the first charging voltage determination process selectively based on a detection result of the amperometric detector. The processor carries out the first charging voltage determination process or the second charging voltage determination process selectively in accordance with a difference between an ambient temperature at a previous time of carrying out the first charging voltage determination process and a current ambient temperature.

The invention relates to a method for detecting lactulose in milk.The method comprises the steps that lactose and lactulose in the milk react and are hydrolyzed into galactose, glucose and fructose through beta-D-galactosidase, glucose oxidase is added to oxidize most of the glucose into gluconic acid, finally catalase is added to remove hydrogen peroxide, and a testing solution is obtained; an ion chromatograph with an ampere detector is used for analyzing the testing solution, and the content of the lactulose is obtained.According to the method, the content of the lactulose in the milk can be accurately and sensitively measured by means of easy and convenient operation.