火焰原子吸收光谱法连续测定铝及铝合金中痕量铅、铜

FAAS successive determination of lead and copper in aluminium and aluminium alloys

首次采用镧盐和碳酸盐作共沉淀剂 ,在氢氧化钠强碱性介质中实现了铝及铝合金中痕量铅、铜与基体的分离富集 ,沉淀用硝酸溶解后 ,在原子吸收光谱仪上进行测定。本方法操作简单 ,不用有机试剂 ,干扰少 ,铅、铜的加标回收率分别在97%～ 10 1%和 98%～ 10 1 3 %之间 ,相对标准偏差分别小于 2 40 %和 2 2 5 % ,测量下限分别为 4 0× 10 - 6 和 1 5× 10 - 6 。

For determining trace lead and copper by FAAS,lanthanum*# and carbonate were used as the coprecipitator for the first time,then the lead and copper in sodium hydroxide medium were separated and enriched. The deposition was dissolved in nitric acid, and the content of lead and copper was determined by FAAS successively. The advantage of this method is simple, without organic reagent,less interference, the recoveries of standard addition for lead and copper are in the range of 97% to 101% and 98% to 101.3%,relative standard deviations are less than 2.40% and 2.25%, the lower determination limits are 4.0×10^(-6) and 1.5×10^(-6) respectively. The accuracy and precision are satisfied with analytical demand.