Hanging mercury electrode device used for measuring electrochemical heavy metals

Abstract

The invention discloses a hanging mercury electrode device used for measuring electrochemical heavy metals, which comprises a cavity, a mercury storing cup, a capillary tube, a sealing needle, a lifting rod and a lifting drive component, wherein the sealing needle and the liquid inlet end of the capillary tube are arranged in the cavity; the output end of the lifting drive component is connected with the upper end of the sealing needle by the lifting rod and drives the sealing needle to make the up and down movement; the lower end of the sealing needle is matched with the liquid inlet of the capillary tube to control the make and break of feed liquid; the liquid inlet of the capillary tube is communicated with the mercury storing cup. The invention is the hanging mercury electrode device used for measuring the electrochemical heavy metals, which has simple and compact structure, convenient operation, high degree of automation, extremely good uniformity of hanging mercury sizes and convenient control of mercury drop sizes.

Description

technical field [0001] The invention mainly relates to the field of electrochemical heavy metal measuring equipment, in particular to an electrode device suitable for electrochemical heavy metal anode voltammetry stripping method. Background technique [0002] Anodic stripping voltammetry, most of the traditional operation process uses mercury film electrode as the suspended mercury electrode. The mercury film electrode is uniformly coated with mercury film on the diaphragm. Because of the fluidity of mercury, the mercury film will not be uniform during the measurement process. , and the diaphragm must be made of metal, which is particularly easy to be oxidized by the solution. During the oxidation process, a current will be generated, which will lead to inaccurate measurement, and the amount of mercury applied each time is inconsistent, resulting in poor reproducibility; and due to the oxidation of the diaphragm, the diaphragm must be polished and smooth after a period of t...

AI Technical Summary

Problems solved by technology

[0002] Anodic stripping voltammetry, most of the traditional operation process uses mercury film electrode as the suspended mercury electrode. The mercury film electrode is uniformly coated with mercury film on the diaphragm. Because of the fluidity of mercury, the mercury film will not be uniform during the measurement process. , and the diaphragm must be conductive metal, especially easy to be oxidized by the solution

During the oxidation process, a current will be generated, which will lead to inaccurate measurement, and the amount of mercury applied each time is inconsistent, resulting in poor reproducibility; and due to the oxidation of the diaphragm, the diaphragm must be polished and smooth after a period of time to remove The oxide layer is a very troublesome thing

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