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砷化合物广泛存在于自然界中,天然水中砷一般以三价或五价状态存在。三价砷有剧烈毒性,是污染环境的重要化学毒物之一。目前,国内外定饮用水中砷的标准为40ppb,一般天然水中砷的含量在ppb数量级,因此要求有高灵敏度的测定水中痕量砷的方法。现有的测定方法如DDC银法、分光光度法、无火焰原子吸收法,其灵敏度均不够理想。阳极溶出伏安法是一种高灵敏度的分析方法。国内曾有邓家祺等研究了痕量砷在玻碳金膜电极上的阳极溶出伏安法,检测下限达0.075ppb,比DDC银法灵敏度高出200多倍。陆石屏用该方法测定了饮用水中痕量砷,但对铜的干扰问题未作详细探讨。本文在上述工作的基础上,进
Arsenic compounds exist widely in nature, and arsenic in natural water is generally present in a trivalent or pentavalent state. Trivalent arsenic is highly toxic and is one of the important chemical poisons that pollute the environment. At present, the standard of arsenic in drinking water at home and abroad is 40 ppb. Generally, the content of arsenic in natural water is on the order of ppb. Therefore, there is a demand for a highly sensitive method for the determination of trace arsenic in water. Existing measurement methods such as DDC silver method, spectrophotometry, flame atomic absorption spectrometry, the sensitivity is not ideal. Anodic stripping voltammetry is a highly sensitive analytical method. In the past Deng Jiaqi et al. Studied the anodic stripping voltammetry of trace amounts of arsenic on glassy carbon electrode, with the detection limit of 0.075ppb, which is 200 times higher than the sensitivity of DDC silver method. Lu Shiping used this method to measure trace amounts of arsenic in drinking water, but the problem of interference with copper was not discussed in detail. This article based on the above work, into