3 results about "Anodic stripping voltammetry" patented technology

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 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.