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本文提出了用流动注射喷射式氢化法直接测定Pb的方法,并对测定条件及共存元素的允许存在量进行了研究,还就K_3Fe(CN)_6对Pb的增敏作用机制进行了探讨并提出了以下反应模式:①K_3Fe(CN)_6首先将Pb~Ⅱ在碱性条件下氧化至Pb~Ⅳ:②K_3Fe(CN)_6再与Pb~Ⅳ发生化学反应:③上述的生成物在用NaBH_4还原时可大大提高Pb的转化率。
In this paper, a method for the direct determination of Pb by flow injection injection hydrogenation has been proposed. The determination of the conditions and the amount of coexisting elements allowed has been studied. The sensitization mechanism of K_3Fe (CN) _6 to Pb has also been discussed. The following reaction model: ① K_3Fe (CN) _6 first of the Pb ~ Ⅱ oxidation to Pb ~ Ⅳ in alkaline conditions: ② K_3Fe (CN) _6 and then Pb ~ Ⅳ chemical reaction: ③ the above products in NaBH_4 reduction Can greatly improve the conversion rate of Pb.