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在磷酸-氢溴酸-辛可宁底液中极谱法测定铅的基础上,本文提出在磷酸-氢溴酸的酸性底液中,以银基汞膜代替滴汞电极的阳极导数示波极谱法测定微量铅。此时铅离子形成[PbBr_4]~(2-)络离子吸附在汞膜上,于电位-0.38伏处产生灵敏的吸附催化波,铅浓度在0.004—2微克/毫升范围与阳极导数波高呈良好线性关系,比滴汞电极阴极导数测定法灵敏度提高约10倍。方法适用于自来水、河水、工业废水中微量
Based on the polarographic determination of lead in phosphoric acid-hydrobromic acid-cinchonine solution, anodic derivative oscillopolarographic determination of silver-mercury in place of dropping mercury electrode was proposed in acid-base solution of phosphoric acid-hydrobromic acid Determination of trace lead. At this time, lead ions form [PbBr_4] ~ (2-) complex ions adsorbed on the mercury film and produce a sensitive adsorption catalytic wave at the potential of -0.38V. The Pb concentration in the range of 0.004-2 μg / ml is in good agreement with the anode derivative wave The linearity is about 10 times more sensitive than the cathodic derivative determination of the drop mercury electrode. The method is suitable for tap water, river water, industrial wastewater trace