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Anode digestion votammetry

An anode stripping voltammetry and voltage technology, which is applied in the field of polarographic analysis, can solve problems such as low accuracy, high Cu concentration, and decreased sensitivity of polarographic instruments, and achieves extended service life, simple testing process, and shortened enrichment time Effect

Inactive Publication Date: 2005-12-21
刘文涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that if the existing anodic stripping voltammetry adopts the working electrode processed with mercury, the sensitivity of the polarograph will be reduced after the working electrode is used for a period of time, and the measured Cu The concentration is obviously high and the accuracy is low

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Embodiment Construction

[0032] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] In order to compare the technical effects of the embodiments of the present invention with the existing anodic stripping voltammetry, before introducing the embodiments of the present invention, at first adopt the existing anodic stripping voltammetry to measure Zn, Zn, Concentration of Cd, Pb, Cu. Existing anodic stripping voltammetry includes four steps of cleaning, enrichment, standing and scanning in each test cycle. The instrument adopts a polarograph whose sensitivity is selected as 10. Mercury-based film working electrode. The waveform diagram of the voltage between the working electrode and the reference electrode of the anode stripping voltammetry as a function of time is shown in figure 1 As shown, the cleaning time QT=18 seconds, the enrichment time FT=36 seconds, the rest time JT=12 seconds, and the scan time ST=6 seconds; both the...

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Abstract

A polarography of anode dissolving out includes four steps of washing concentrating , stewing and scanning in each test cycle as at least one voltage of concentration voltage in concentrating step and stewing voltage in stewing step is less than minus 1.7 V in one period or several periods of time . The present invention can activate operating electrode processed by Hg for raising sensitivity of polarography.

Description

Technical field: [0001] The invention relates to a polarographic analysis method, in particular to an anode stripping voltammetry. Background technique: [0002] Anodic stripping voltammetry is an analytical method for measuring the concentration of Zn, Cd, Pb, and Cu in water with a polarograph, mainly including linear anodic stripping voltammetry, AC anodic stripping voltammetry, square wave anodic stripping voltammetry, Pulsed anodic stripping voltammetry and differential pulsed anodic stripping voltammetry, etc. Anodic stripping voltammetry includes four steps of cleaning, enrichment, standing and scanning. The enrichment voltage in the enrichment step and the resting voltage in the resting step can vary with time or not. Varying constant voltage. [0003] On November 11, 1998, an invention patent called "Polarographic Anodic Dissolution Analysis Method" was announced in the Invention Patent Bulletin, the application number: 94110779.5, and the authorized publication n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42G01N27/48
CPCG01N27/42
Inventor 刘文涛
Owner 刘文涛
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