Selenium content detection method

Abstract

The invention discloses an electrochemical detection method for the selenium content. It uses the thermal cracking graphite as the electrode host; the bismuth formed by the BiCl3, Se(IV) in situ enrichment is as the working electrode, which forms a kind of compound with the enriching selenium. In the scanning electric potential of -1000mV--1200mV on cathode, it gets a sensitive catalyzing hydrogen wave detected by the Osteryang square wave cathode stripping volt-ampere method to detect the Se(IV). Because the Bi has no toxicity, the invention has avoided the traditional hydrargyrum electrode pollution. Also it has simple process, high sensitivity, low cost. It can analyze the trace selenium and its valency in natural water. So it has widely application future in industrial and agricultural production, environment protection, medical treatment and science study.

Description

A method for measuring selenium content Technical field The invention relates to an electrochemical determination method of selenium content, belonging to the technical field of analytical chemistry, especially electroanalytical chemistry. Background technique Selenium is an important natural semi-metal element, which is widely distributed in water environment, minerals, soil, biological system, and even atmospheric environment. Selenium can exist in the natural environment in a variety of chemical states (VI, IV, 0, -II) as well as organic and inorganic forms. Among them, Se(VI) and Se(IV) are the most common. In nutrition, selenium is one of the essential trace elements for animals, plants and humans. It plays an important role in biological growth, metabolism, cell anti-oxidation, anti-cancer, and reduction of heavy metal toxicity [Reviewofseleniumtoxicityintheaquaticfoodchain.ScienceofTheTotalEnvironment, 2004, 326(1-3): P1-31]. However, the biological function of seleni...

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Problems solved by technology

However, due to the toxicity of mercury and its compounds and their harm to the environment, their application has been greatly restricted in recent years. At the same time, selenium is prone to peak splitting on mercury electrodes, which affects its analytical performance [CyclicandstrippingvoltammetryofSe(+4) andSe(-2)attheHMDEinacidicmedia.JournalofElectroanalyticalChemistry, 1982,137(2):247-259;

And the anodic stripping method reproducibility on the gold class electrode is poor, and situations such as multi-peak occur, and given quantitative determination also brings trouble .Talanta, 2006, 69(4): 877-881]

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