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在用石墨炉原子吸收法直接测定海水中的痕量元素Cd、Pb、Cu、Co、Ni、V、Se、As、Mn和Cr中发现,所选用的有机基体改进剂如柠檬酸、酒石酸和抗坏血酸等,可以有效地消除海水的基体干扰。本文详细地探讨了有机基体改进剂的作用机理。有机基体改进剂主要几种作用为:助熔,阻止分析元素与海水形成共挥发体,降低分析元素的挥发度以及形成强的还原气氛。
In the direct determination of trace elements Cd, Pb, Cu, Co, Ni, V, Se, As, Mn and Cr in seawater by graphite furnace atomic absorption spectrometry, it has been found that organic matrix modifiers such as citric acid, tartaric acid and Ascorbic acid, etc., can effectively eliminate the matrix interference of seawater. This paper discusses in detail the mechanism of action of organic matrix modifiers. The main functions of the organic matrix improver are: fluxing, preventing the analytes from forming co-volatiles with seawater, reducing the volatility of the analyte and forming a strong reducing atmosphere.