伏安法对聚苯胺溶液中铅的检测与分析

文章利用化学氧化法合成的聚苯胺作为吸附剂,研究了伏安法测定痕量经聚苯胺吸附后溶液中的铅离子。研究发现,在电位-0.51 V能产生铅的灵敏溶出峰,线性范围分别为0.008~0.08μg/L,检出限分别为2.0×10-9 g/L。利用聚苯胺,对初始浓度为1.0×10-3 g/L的标准溶液吸附,Pb2+最大吸附量为0.299 mg/g,吸附率为99.94%。通过采用1.6 mol/L HNO3解吸,得到回收率为97%,富集倍数为10倍。可用于水中痕量铅的富集与测定,结果满意。

Polyaniline Solution for Detection and Analysis of Lead in Voltammetry

The article uses the anodic stripping valtammetry to measure the cadmium and the lead, and has studied the synthesis polyaniline which is combined by chemistry oxo-process as the absorbent, besides, it also studies the absorption and desorption condition of the synthesis polyaniline to heavy metal Pd^2＋. The research discovered that electric potential - 0.51 V separately produced the lead, the linearity range is 0.008-0.08 μg/L respectively, and picks out limits is 2.0×10^-9/L respectively. It adsorpted the standard solution ,whose preliminary test is1.0×10^-3 g/L while the biggest adsorptive capacity of Pb^2＋ is 0.299 mg/g, and the adsorption rate is 99.94 % by polyaniline. By adopting the desorption with 1.6 mol/L HNO3, the returns-ratio is 97 %, and the multiple for original 10 times. The result is satisfied, because they can concentrate and measure the cadmium and lead.