6 results about "Anodic stripping voltammetry" patented technology

The invention relates to the technical field of detection and identification of fentanyl substances, and discloses a selective quantitative detection method of fentanyl. According to the method, a differential pulse voltammetry (DPV) is used for making a linear relation diagram of a potassium ferricyanide peak current and fentanyl solutions with different concentrations to obtain a standard working curve, a linear equation is obtained through the standard curve, and the detection limit is 1.0 * 10 <-12 > mol.L <-1 >; the molecularly imprinted membrane modified electrode prepared by the invention is used for measuring the peak current of a potassium ferricyanide solution, so that fentanyl molecules can be indirectly and quantitatively analyzed and measured. The method is characterized in that a fentanyl molecularly imprinted membrane is electrically polymerized on the surface of a glassy carbon electrode, m-phenylenediamine is used as a functional monomer, and the selectivity and sensitivity of an electrochemical method for detecting fentanyl are improved. Meanwhile, by taking an adsorption pulse stripping voltammetry (DPASV) as a detection technology, a method capable of rapidly detecting fentanyl molecules in the presence of various drugs is established. The molecularly imprinted membrane electrode disclosed by the invention is simple to prepare, quick in response and good in selectivity and reproducibility, and can be repeatedly used for more than five times.

The invention discloses a method for rapidly detecting inorganic arsenic in aquatic animals. The method comprises the following steps: pre-treating an aquatic animal sample to be detected to obtain a sample solution to be detected; the method comprises the following steps: taking a silk-screen printing electrode as a working electrode, electrifying a to-be-detected sample solution by adopting anodic stripping voltammetry to collect an electrical response parameter in the electrifying process, and further obtaining the content of inorganic arsenic according to the electrical response parameter. According to the method, the screen-printed electrode is adopted to replace a traditional glassy carbon electrode or gold electrode, polishing is not needed, operation is easy, throwing is achieved when the electrode is used, the price is low, batch production is easy, and the performance is stable, and the electrochemical anodic stripping voltammetry is applied to detection of inorganic arsenic in aquatic animals for the first time; the shape of the working electrode and an ink carbon-based material in the working electrode are optimized, and the quantitation limit of the finally measured sample is as low as 0.1 mg / kg; the method is simple, rapid and efficient, and is suitable for large-scale production and application on a base layer.

The invention provides an electrochemical sensor based on an MOF-on-MOF and MWCNTs-COOH synergistic signal amplification effect as well as a preparation method and application of the electrochemical sensor based on the MOF-on-MOF and MWCNTs-COOH synergistic signal amplification effect. The sensor comprises a silk-screen printing electrode, MWCNTs-COOH modified on the surface of the silk-screen printing electrode, and flower-shaped MIL-88B-NH2-coated UiO-66-NH2, and the MWCNTs-COOH is modified on the surface of the silk-screen printing electrode. Wherein the MIL-88B-NH2 (at) UiO-66-NH2 is synthesized by carrying out in-situ growth on the MIL-88B-NH2 on the surface of a UiO-66-NH2 crystal, so as to obtain the MIL-88B-NH2 (at) UiO-66-NH2 crystal. The sensor can be used for detecting Pb < 2 + >, Cu < 2 + > and / or Hg < 2 + > in a water sample, an MIL-88B-NH2 (at) UiO-66-NH2 / MWCNTs-COOH / SPCE modified electrode is used as a working electrode, an Ag / AgCl electrode is used as a reference electrode, a carbon electrode is used as an auxiliary electrode, differential pulse anodic stripping voltammetry (DPASV) is adopted for detection, a redox peak of heavy metal ions (HMIs) is used as an index signal, and no extra signal label needs to be introduced. The linear range of the sensor is 0.10-25 [mu] M, and the detection limits of the sensor are respectively as low as 5.55 nM, 4.16 nM and 6.38 nM. The sensor prepared by the invention shows excellent selectivity, reproducibility and stability on HMIs in river water and tap water.

The utility model discloses a device for measuring lead by anodic stripping voltammetry, which comprises an experimental mechanism and a measuring mechanism, the experiment mechanism comprises a bottom plate, a plurality of rotating discs movably embedded in the top of the bottom plate, two guide rods connected with the tops of the rotating discs, a sliding frame connected between the two guide rods in a sliding mode, a bracket installed on one side of the sliding frame, a liquid cup movably penetrating through the bottom of the bracket, and a valve connected with the bottom end of the liquid cup. The measuring mechanism comprises a titration cup attached to the top of the bottom plate, a plurality of droppers attached to the top of the titration cup, and liquid bags connected with the rear ends of the droppers. According to the utility model, the plurality of liquid cups can automatically slide to the bottom end of the guide rod under the influence of self weight after being used, so that the gravity center of the device is reduced, and the size of the bottom plate is increased, so that the device is not easy to topple over, and safety accidents are prevented.

The application discloses an electrochemical detection method for copper ion impurities in zinc electrolyte, wherein acetic acid-sodium acetate solution is used as a background solution, then mixed with an equal volume of zinc electrolyte to obtain a to-be-detected solution, and the pH value of the to-be-detected solution is adjusted to 3.0-4.0; silver nanowires are dispersed in an ethanol solution, then coated on FTO conductive glass as a working electrode, a platinum sheet is used as a counter electrode, and an Ag / AgCl electrode is used as a reference electrode; and an electrochemical workstation is used to obtain the oxidation current of copper ions after reduction deposition in the to-be-detected solution by differential pulse anodic stripping voltammetry I Cu , in the unit of muA; the concentration of copper ions in the to-be-detected solution C Cu is obtained by the following formula: C Cu ( I Cu + 2.69) / 151.55, in the unit of mg / L. The application realizes the detection of trace copper ion impurities in high-zinc-concentration electrolyte, is convenient to operate, does not need expensive equipment, and is suitable for real-time detection in a production environment.

A system for detecting trace heavy metals in a solution is provided herein. The system includes a screen printed electrode comprising a working electrode, a counter electrode, and a reference electrode arranged on a substrate surface, a metal coating applied to the working electrode, a potentiostat connected to the screen printed electrode, and a processor. The processor is configured to control the potentiostat to perform anodic stripping voltammetry on the screen printed electrode and to analyze results of the voltammetry to detect presence of trace heavy metals in the solution.