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在碱性介质中,铋诱导下列反应很快进行。 Pb~(2+)+SnO_2~(2-)+OH~-→Pb°+SnO_3~(2-)+H~+反应的速度与诱导剂铋的量之间有定量关系。藉溶液中出现黑色铅的悬浮物来指示诱导终点,从而定量测定微量的铋。兰利生等以氰化物掩蔽干扰元素,利用此反应测定了植物和水样中的铋。本文作者发现,当体系中存在少量硫化物时,诱导反应速度大增,诱导期明显缩短,测定灵敏度可提高60～100倍。同时实验在常温下即可进行,不需任何恒温加热手段。本法拟定用阴离子交换分离干扰元素,诱导法(目视)测定岩石矿物中微量铋。方法的检测下限为0.1ng/ml。测定范围为0.17ng/ml—1.7ng/ml,即8.1×10~(-10)-8.1×10~(-9)M。
In alkaline medium, bismuth induced the following reaction to proceed rapidly. There is a quantitative relationship between the reaction rate of Pb ~ (2 +) + SnO_2 ~ (2 -) + OH ~ - → Pb ° + SnO_3 ~ (2 -) + H ~ + and the amount of bismuth. A trace of bismuth was quantified by suspending black lead in solution to indicate the induction endpoint. Lan Lisheng and other cyanide masking interference elements, the use of this reaction determination of plants and water samples of bismuth. The authors found that when a small amount of sulfide is present in the system, the induction reaction rate increases significantly, the induction period is significantly shortened, and the assay sensitivity can be increased by 60 to 100 times. At the same time the experiment can be carried out at room temperature, without any means of constant temperature heating. This method is proposed to separate interference elements by anion exchange, and to induce (visual) determination of trace bismuth in rock and mineral. The detection limit of the method is 0.1ng / ml. The measurement range is from 0.17 ng / ml to 1.7 ng / ml, ie 8.1 × 10 -10 -8.1 × 10 -9 M.