51results about "Material electrochemical variables" patented technology

The invention discloses an on-line detection instrument for hydrogen fluoride gas. The on-line detection instrument comprises a detection system and a central processing system, wherein the detection system comprises a sampling device and an HF (Hydrogen Fluoride) gas sensor which is connected with the central processing system; the sampling device comprises a gas detection chamber; the gas detection chamber is provided with a gas inlet and a gas outlet which are connected with a GIS (Geographic Information System) high-pressure gas chamber; the HF gas sensor is fixed on the gas detection chamber; a testing end of the HF gas sensor is positioned inside the gas detection chamber; gas from the GIS high-pressure gas chamber enters the gas detection chamber; the HF gas sensor is used for detecting the concentration of the HF gas in the gas, and used for transmitting detection information to the central processing system to be processed so as to obtain the content of the HF gas. The invention further discloses a method for quantitatively detecting the hydrogen fluoride gas by using the detection instrument. By utilizing the detection instrument and the method, the content of the hydrogen fluoride gas can be rapidly and accurately detected in real time, and SF6 inside SF6 electric equipment is not lost.

The invention relates to a determination method for chloride ions of foods, which belongs to the technical field of food analysis. The method takes a chloride ion selective electrode as an indicator electrode and a two-liquid junction saturated calomel electrode as a reference electrode which are inserted in a sample solution to form a working battery, and when the concentration of chloride ions is in a range of 1 to 10-5g / L, the battery electromotive force is linear with the logarithm of chloride ion activity, and the concentration of the chloride ions of the foods is determined by a digital ion meter. The method of the invention adopts ultrasonic extraction and direct reading concentration method coupling techniques to determine the chlorine content in samples, and the used ultrasonic cleaning device greatly improves extraction speed; and the method has the obvious advantages of difficult sample contamination, low reagent consumption, simpleness and rapidity, accurate and reliable result.

The invention relates to a method for measuring formaldehyde in aqueous solution by utilizing electrochemical luminescence of terpyridyl ruthenium. The aqueous solution sample containing the formaldehyde is taken to be mixed with terpyridyl ruthenium solution with the pH value of 8.6 and the concentration of 1mmol/L, wherein, the concentration of the formaldehyde aqueous solution is 0.9-300mg/L; after that, cyclic voltammetry is carried out within the range of 0.2-1.5v, and the speed is 0.1v/s; a working electrode of electrochemical luminescence measurement is a glassy carbon electrode, and then linear relation exists within a certain range according to the electrochemical illumination intensity and the concentration of the formaldehyde; quantitative analysis is carried out on the formaldehyde in the aqueous solution. The method can be used for measuring the content of the formaldehyde within the concentration range of 0.9-300mg/L. The method for measuring formaldehyde by utilizing electrochemical luminescence has the advantages of simple operation, rapid measuring speed, lower price of an analytical instrument and the like, and can be expected to be used for daily analysis.

The invention provides a sensor for detecting penicillin in liquid. A method for preparing the sensor comprises the following steps of: electroplating nanogold on a platinum disk electrode modified by a bilayer lipid membrane; and combining penicillin antibody on the platinum disk electrode modified by the nanogold bilayer lipid membrane to make the platinum disk electrode modified by the nanogold bilayer lipid membrane and combined with the penicillin antibody. The sensor has high sensitivity and an acceptable linear range and can save the time and simplify the operating procedure.

The invention provides an electrochemical pipeline erosion corrosion testing device. A sample adopted in an experimental facility is a real pipeline which is clamped by PVC (polyvinyl chloride) flanges at two ends and connected into a pipeline by the same, and the flange at one end is used for mounting of a solid-state reference electrode. A cylindrical electrode is adopted as an auxiliary electrode which is positioned on a central axis of the pipeline, a water-facing end of the auxiliary electrode which is conically shaped is inserted into a central circular ring of an externally-connected flange and has functions of supporting and position adjusting, and a thread is formed in an outer side of a water outlet end of the auxiliary electrode, is fixed in the center of a titanium alloy flangeand has functions of fixing and supporting. The electrochemical pipeline erosion corrosion testing device has the advantages that the sample in the experimental facility is tubular and can be obtained by cutting a real pipeline or processing a bar material, an internal flow state in an annular tube section of the sample is similar to that in a real pipeline, mounting is facilitated, and testing efficiency can be improved; by a three-electrode connection manner, stability maintaining of medium flow state inside an experimental pipeline can be facilitated, a testing result is enabled to be morestable and reliable, and analysis of a corrosion mechanism of a material in a pipeline erosion corrosion environment can be facilitated better.

A gas measurement system includes a sensor element and an associated electronic control unit (ECU) or the like connected thereto for receiving sensor element emf outputs. The ECU is configured to provide output signals or parameters indicative of ammonia and heavy HC gas concentrations. The sensor element has an NH₃ sensor electrode output and a NO_x sensor electrode output. The information conveyed by the NO_x sensor electrode output may be selectively used by the ECU, in accord with so-called emf selection rules, to correct for a cross-interference effect that NO₂ has on the NH₃ electrode. Heavy HC gas concentrations may cause electrochemical activity on the NH₃ electrode, and can be misinterpreted. A further emf selection rule is configured to detect the presence of heavy HC gas and is used by the ECU to suppress an output signal or parameter indicative of an ammonia gas concentration.

A bipolar-electrode electrochemiluminescence imaging electrolytic cell adopts the structure that a middle substrate is stuck to the upper surface of a lower substrate through glue; an upper substrate is stuck to the upper surface of the middle substrate through glue; the upper substrate, the middle substrate and the lower substrate all adopt organic glass sheets; an electrolytic cell c is processed in the center of the upper substrate; the middle substrate is arranged at the bottom of the electrolytic cell c; a channel b is processed in the centers of the upper and middle substrates; the lower substrate is arranged at the bottom of the channel b; a left liquid storage tank a is processed at the left end of the channel b in the upper and middle substrates, and a right liquid storage tank d is processed at the right end of the channel b in the upper and middle substrates; the channel b is communicated with the left liquid storage tank a and the right liquid storage tank d. The bipolar-electrode electrochemiluminescence imaging electrolytic cell has the advantages of reasonable design, simple structure and reusability, can adopt either an upright microscope or an inverted microscope, and can be popularized and applied in bipolar-electrode electrochemiluminescence imaging analysis.

The invention discloses a method for quickly detecting aflatoxin B1 by PbS quantum dot. The method is characterized by comprising the steps of: adding Pb(NO3)2 solution into mercaptoacetic acid and Na2S solution to prepare PbS quantum dot; preparing 10mug/mL QD-Ab solution by coupling of PbS quantum dot and aflatoxin B1 monoclonal antibody; adding aflatoxin B1-bovine serum albumin conjugate in an elisa plate to coat the elisa plate, and simultaneously adding AFB1 solution and QD-Ab solution, after incubation digestion, adding Hg2Cl solution, getting constant volume by adding acetic acid buffer solution, then preparing the to-be-detected solution; deoxidizing the to-be-detected solution, adding the deoxidized to-be-detected solution into a pretreated glassy carbon electrode for detection, and calculating the content of the aflatoxin B1 according to a standard curve relation between the dissolving peak size of Pb<2+> and the concentration of aflatoxin B1 solution. The method has the advantages of high sensitivity, strong selectivity, excellent stability, high accuracy and quick detection speed.

The invention relates to an on-line automatic cleaning device of an electrochemical glass electrode. At present, the cleaning of the surface of the glass electrode mainly depends on the artificial cleaning, which is not only cumbersome, but also unable to realize the continuous detection. The top part of a cleaning base of the invention is provided with an end cover, the bottom part is connected with the top part of a circular cup-shaped support, the bottom part of the support is provided with a motor, and a power output shaft of the motor is fixedly connected with a sliding sleeve. A sliding slot is slantingly arranged on the inner side wall of the sliding sleeve. A push rod penetrates a central through hole at the bottom part of the cleaning base to be arranged in the inner cavity of the sliding sleeve, the top part of the push rod is fixedly provided with a brush, the lower part of the push rod is provided with a bump, the bump is movably arranged in the sliding slot and can be moved along the sliding slot. The on-line automatic cleaning device has the advantages of simple structure and convenient realization, which can effectively remove the serious accumulated filth on the surface of the electrode and simultaneously can realize the continuous working mode of working while cleaning of the electrode.

The invention discloses a co-fired method used for an oxygen sensor ceramic sensing head substrate and a platinum electrode, comprising the steps as follows: A, the ceramic sensing head billet is sintered for 2-4 hours in a sintering furnace at the temperature of 900-1,100 DEG C and cooled with the furnace to the temperature of 150-200 DEG C and then taken out and cooled in the air; B, the surface of the ceramic sensing head substrate is cleaned by an air gun and subsequently coated by the platinum electrode layer; C, the ceramic sensing head substrate with the surface coated by the platinum electrode layer is arranged in a high-temperature sintering furnace and sintered for 4-7 hours at the temperature of 1,400-1,600 DEG C. The invention provides a novel co-fired process method which effectively reinforces the compressive strength of a ceramic sensing head forming body, leads the platinum particles to be embedded into the ceramic sensing head substrate which is sintered in a box and has a plurality of holes on the surface, so as to lead the platinum and the ceramic sensing head substrate to be fused with each other, greatly reinforce the adhesion strength of the platinum electrode layer and the substrate, thus effectively reinforcing the compressive strength of the ceramic sensing head forming body.

The invention relates to an electrochemical method for detecting banned additive urotropin in food, which comprises the following steps of: respectively and simultaneously inserting a working electrode carbon paste electrode, a reference electrode saturated calomel electrode and a counter electrode platinum sheet into 0.1mol.L-1PBS (Phosphate Buffer Solution) buffer solution to carry out differential pulse voltammetry scanning to obtain the oxidation peak current value of the urotropin, wherein the pH of the buffer solution is 6, the buffer solution contains a series of urotropin standard solution in different concentrations, and the oxidation peak current value and the concentration of the urotropin have a good linear relationship; with the same method, the oxidation peak current value of the sample solution is obtained; and according to a standard curve and a corresponding linear regression equation, the density of the urotropin in the sample is obtained. The method is simple in operation, is convenient and quick and has a low detection cost, and the urotropin can be directly detected.

The invention discloses a method for detecting low density lipoprotein cholesterin through double-enzyme concerted catalysis silver deposition. The method comprises the following steps: firstly, forming a sulfydryl-containing poly-aniline phenthiol film on an electrode surface through an electric polymerization method; performing electroreduction on gold ions on the electrode surface through a constant potential deposition method, thereby forming nanometer gold; anchoring the nanometer gold on the electrode surface through sulfydryl on an electric polymer membrane; fixing an apolipoprotein apoB-100 antibody on the nanometer gold; and via identification of the apoB-100 antibody on the specificity of low density lipoprotein, capturing the low density lipoprotein on the electrode surface. Under the synergistic effect of two enzymes of cholesterol esterase and cholesterol oxidase, cholesterol in the low density lipoprotein is decomposed and a weak reducing agent H2O2 is generated; the reducing agent can reduce and deposit silver ions on the gold nanometer grain surface; lastly, a standard curve is drawn by detecting a dissolving volt-ampere current value of an elemental silver, and the detection for the low density lipoprotein cholesterin can be realized.

The invention discloses a nondestructive detection system for the state of a crude oil tank bottom plate corrosion product. The system comprises an electrochemical impedance spectrum acquisition subsystem (1), an acoustic emission burst information acquisition subsystem (2) and a crude oil tank sedimentation water bottom plate corrosion product state judgment subsystem (3). The generation, dissolution and fracture situations of a corrosion product film on a bottom plate in a crude oil tank under the corrosion environment of sedimentation water are obtained by analyzing electrochemical impedance spectra and acoustic emission energy spectra under the acquisition time, so that the stress corrosion situation and the damage situation of the bottom plate in the crude oil tank can be judged, and the loss of equipment and economy due to stress corrosion is reduced.

The invention discloses a method for preparing a graphene chemically modified electrode through in-situ growth, which mainly comprises the following steps: (A) substrate cleaning; (B) in-situ growth of graphene: placing the substrate obtained by the step (A) in a clean quartz boat, and placing the quartz boat in a quartz tube of a horizontal resistance furnace; introducing argon to remove oxygen in the quartz tube; under the protection of the argon, heating the quartz tube to the growth temperature of graphene; preserving heat for 1-180 minutes while introducing carbon source gas and hydrogen instead; then, cooling to room temperature under the protection of argon, and taking out a product to obtain a substrate with in-situ grown graphene; (C) connecting the substrate with graphene of in-situ growth, obtained by the step (B), with a wire or directly putting the substrate into a clamp to obtain the graphene chemically modified electrode. The preparation process of the method is simple, the preparation efficiency is high, and the method is suitable for large-scale production; the prepared graphene chemically modified electrode has good quality and excellent detection performance.

The invention discloses a method for detecting trace hydroquinone by using a graphene/carbon nano tube modified electrode. The graphene/carbon nano tube modified electrode is a working electrode, and a method for detecting trace hydroquinone in water is established by means of different current catalytic strengths of the graphene/carbon nano tube modified electrode to hydroquinone with the concentration of respectively 0.6mu mol/L, 0.8mu mol/L, 2mu mol/L, 4mu mol/L, 6mu mol/L, 8mu mol/L, 20mu mol/L, 40mu mol/L and 60mu mol/L. The scanning potential is -0.2-0.6V, and the scanning speed is 100mV/s. In a 0.02mol/L phosphate buffered solution (PBS) with a pH value of 7.4, the concentration of the hydroquinone is within the range of 6*10<-7>-6*10<-5>mol/L, a favorable linear relation is formed between the concentration and the catalytic current strength on the surface of the electrode, and the detection limit is 2.13*10<-7>mol/L. The method is sensitive, good in selectivity, and more convenient and simpler in detection of low-concentration hydroquinone.

Disclosed is a method for calculating a ratio of glycosylated hemoglobin with high accuracy by electrochemically detecting the concentration of fructosyl valine or fructosyl valyl-histidine in a sample. Also disclosed is an apparatus for assaying glucose and glycosylated hemoglobin simultaneously. Further disclosed are a method and an apparatus for removing hydrogen peroxide in a sample.

The invention discloses a preparation method of a paper-based photocathode biosensor for detecting microRNA. A gold nano-particle layer is coated in a working area of a paper-based carbon working electrode; polyhedral cuprous oxide is electrodeposited and lots of silver sulfide quantum dots can be loaded, and a photoelectric sensitized structure is formed, so that the cathode photocurrent is increased substantially; and in the presence of the target microRNA, a double-strand-specific-nuclease-induced target cycle reaction and a cascaded stem-branch hybridization strand reaction are made to obtain a negatively charged dendritic DNA double-helix structure. After assembling of positively charged gold nanoparticles, a gold tree with the good glucose oxidase mimicking activity is formed, so that the glucose oxidation reaction is catalyzed, the dissolved oxygen of the electron acceptor is consumed, the cathode photocurrent signal is reduced, and sensitive detection of the microRNA is realized.

This invention relates to non crystal diamonds film electrode with phosphor and its process method, which solves the problems of non crystal diamonds film low conductive property and large stress and bad basic sticking force and comprises the following steps: a, clearing base; b, ion etching; c, flowing mixture gas; d, using filter cathode vacuum arc deposition system for film deposition; e, connecting wires; f, electricity chemical process to get the electrode.

The invention discloses a preparation method of a compound modified electrode for simultaneously detecting lead and cadmium ions. The preparation method comprises the following steps: preparing graphene; preparing nano graphene; preparing micro-nano carbon spheres; synthesizing a micro-nano carbon sphere, nano graphene and naphthol compound modification liquid; modifying a working electrode based on a micro-nano carbon sphere, nano graphene and naphthol compound modification liquid; and simultaneously detecting heavy metal lead ions and cadmium ions. When the modified electrode manufactured by the method is applied to a sensor, the simultaneous sensitive detection of heavy metal lead ions and cadmium ions with similar potentials is realized, the detection sensitivity and the detection speed can be effectively improved, and the detection limit is far lower than the minimum content requirement of the heavy metal lead ions and cadmium ions in drinking water; and the compound modified electrode is simple in structure, low in energy consumption, raw material cost, process cost and labor cost, excellent in mechanical property and chemical corrosion resistance, and capable of achieving the effects of saving energy, reducing emission, treating environmental pollution and guaranteeing life health, and the whole detection system is convenient to achieve miniaturization and automation.

The invention provides a system and method for online detection of microscale water and trace water in an organic phase; the system includes a first experimental device and a water content measurement device; the first experimental device is used for providing an experimental system for a differentiated pulse cathodic stripping voltammetry; the experimental system is a two-electrode system, wherein a work electrode is a gold ultramicro-electrode; when the gold ultramicro-electrode is applied with a positive voltage, residual water in an organic phase solution oxidizes the surface of the gold ultramicro-electrode into a gold oxide thin film; when the gold ultramicro-electrode is applied with a negative voltage, the gold oxide thin film is reduced into gold, and the peak current value of the dissolution process shows a positive-correlation relationship with the water content in the organic phase; the water content measurement device is used for measuring the water content value in the organic phase solution according to the corresponding relationship of the peak current value of the dissolution process of reducing the gold oxide thin film into gold with the water content in the organic phase. The system and the method can simply and conveniently detect the water content in the organic phase.