酸溶法用于聚合氯化铝中铅、镉测定前处理的研究

Research on the Pretreatment of Determination of Pb and Cd Content Content in Aluminium Polychlorid by Acid-soluble Method

用盐酸溶解聚合氯化铝，代替GB15892－1995国标中的前处理，以火焰原子吸收法直接测定其中的铅、镉含量。回收率铅为89．0－93．0％，镉为90.5－97．0％，其变异系数分别为0．82－2.92％、1．25－5．53％。仪器灵敏度铅、镉分别为0．4mg/L,0．03mg/L。取样品5．0ml，最低检出浓度铅、镉分别为4mg/L，0.3mg/L。用该法测定，不受铅、铁等多种元素的干扰。建议推广使用。

Aluminium polychlorid was dissolved with hydrochloric acid (HCL) instead of the pretreatment method in state standard (GB15892-1995), and the content of Pb and Cd in it were directly tested by flame atomic absorption spectrometry(FASS). The rescovery rates of Pb and Cd were 89.0-93 .0% and 90.5-97 .0% respectively; the coefficients of variation(CV) were 0.82- 2.92% and 1 .25%-5 .53 respectively; the instrnmentd Sensitivitys were 0. 4mg/L and 0. 03mg/L respetively. The minimum detectable concentrations (MDC) of Pb and Cd were 4mg/L and 0. 3mg/L respectively in 5 .0ml sample. This method was not interfered by Al. Fe and other elements, so it could be ed widely.