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检测铅离子常用的方法有AAS法和双硫腙比色法,前者直接测定工业废水中的铅,灵敏度不高;后者操作步骤繁琐,须使用剧毒试剂氰化钾,污染环境,用流动注射化学发光法测定铅,仪器简单、操作简便、试样消耗量少、精密度高、分析快速准确、自动化程度高,因此,把流动注射分析和化学发光结合起来可以发挥两者的优点,利用光泽精(Lucigenin)-H_2O_2体系化学发光法测定铅,国内外报道甚少,我们发现,铅(Ⅱ)可催化H_2O_2氧化Lucigenin,通过条件实验,建立了流动注射化学发光测定痕量铅的方法,由于化学发光反应在强碱性介质中进行,大多数金属离子形成氢氧化物,采用巯基棉预先分离,本法灵敏度高,而且选择性好,应用于工业废水中痕量铅的测定,获得满意效果。
Common methods for the detection of lead ions are AAS and dithizone colorimetric method, the former direct determination of lead in industrial waste water, the sensitivity is not high; the latter steps tedious operation, the use of highly toxic reagents to potassium cyanide, pollute the environment, with the flow The injection chemiluminescence method for the determination of lead is simple, simple and easy to operate, the sample consumption is low, the precision is high, the analysis is fast and accurate, and the degree of automation is high. Therefore, the combination of flow injection analysis and chemiluminescence can exert the advantages of both, We have found that lead (Ⅱ) can catalyze the oxidation of Lucigenin with H_2O_2 by the chemiluminescence method of Lucigenin-H_2O_2 system. We established the method of flow injection chemiluminescence for the determination of trace lead by the condition experiments. Since the chemiluminescence reaction is carried out in a strong alkaline medium, most of the metal ions form hydroxides, which are pre-separated by using thiol cotton. This method has high sensitivity and good selectivity and is applied to the determination of trace lead in industrial wastewater and is satisfactory effect.