DDDC－MIBK萃取火焰原子吸收测定水中微量铅

DETERMINATION OF MICRO LEAD IN WATER USING DDDC-MIBK EXTRACTION AND FLAME ATOMIC ABSORPTION

本文研究了二乙基二硫代氨基甲酸二乙胺甲基异丁基酮（ＤＤＤＣ－ＭＩＢＫ）体系络合萃取水样中微量铅和火焰原子吸收测定的方法。１ｍｇ的铁（Ⅲ）、锰（Ⅱ）、钾（Ｉ）、铜（Ⅱ）、镉（Ⅱ）、铝（Ⅲ）、硼（Ⅲ）、镁（Ⅱ）、和２００ｍｇ钠（Ｉ）不干扰铅的测定，０．８ｍｇ以上铬（Ⅵ）的干扰可采用加入０．５ｍｌ５％盐酸羟胺消除。该法测定铅的特征浓度（１％吸收）、检测限、线性范围变异系数和回收率分别为０．００４６、０．００４４、０—５．０μｇ／ｍｌ、０．７８和９８．５—１０２％。运用此法成功地测定了环境水样中的微量铅。

A method has been studied for determination of micro lead in water using complex extraction by diethylammonium diethyldithiocarbamate-methyl isobutyl ketone (DDDO-MIBK) system and flame atomic absorption. 1 mg of Fe(Ⅲ), Mn(Ⅱ), K(Ⅰ), Cu(Ⅱ), Cd(Ⅱ), Al(Ⅲ), B(Ⅲ), Mg(Ⅱ) a.nd 200 mg of Na(Ⅰ) do not interfere with the determination of lead; th e interference of chromium (Ⅵ) over 0.8 mg can be eliminated by adding 0.5 ml of 5% hydrolxyamine hydrochloride. The characteristic concentration (1% absorption), detection limit, lnear range,coefficient of variation and recovery of the method of determination o f lead are 0. 0046, 0. 0044, 0-5.0 μg/ml, 0 .78 and 98. 5-102%, respectively. The method was successfully applied to determine the micro lead in the environmental waters.