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环境分析中微量镉的测定方法是很多的,原子吸收分光光度法快速、准确,灵敏度高;阳极溶出法也较简便,灵敏度高,吴敦虎就曾用巯基棉富集阳极溶出法测定天然水中镉,但所用仪器还不能普及。通常所用双硫腙四氯化碳萃取分光光度法较繁琐,条件控制较严格。我们采用巯基棉富集分离可消除一些干扰离子的干扰,再在强碱性(约1NNaOH)条件下用双硫腙四氯化碳萃取分光光度法测定镉,通过一些条件实验和标样的测定,证明所提出的方法是可行和可靠的。本方法具有下列优点:一是,可以不用KCN剧毒物质掩蔽干扰离子;二是,避免了多次的萃取反萃取,简化了繁琐的操作程序;三是,用巯
Determination of trace amounts of cadmium in environmental analysis methods are many, atomic absorption spectrophotometry fast, accurate, high sensitivity; anodic stripping method is also more convenient, high sensitivity, Wu Dunhu had used thiamine-based anodic stripping anodic dissolution of natural water cadmium, But the instruments used are not yet universal. Commonly used dithizone carbon tetrachloride extraction spectrophotometry more cumbersome, conditional control is more stringent. We use sulfhydryl cotton enrichment and separation can eliminate interference of some interfering ions, and then strong alkaline (about 1NNaOH) with dithizone carbon tetrachloride extraction spectrophotometric determination of cadmium, through a number of experimental conditions and the determination of the standard , Proves that the proposed method is feasible and reliable. The method has the following advantages: firstly, it can eliminate interference ions with KCN highly toxic substances; secondly, avoid repeated extraction and back extraction and simplify cumbersome operation procedures; thirdly,