APDC共沉淀分离富集-火焰原子吸收分光光度法测定明矾中的痕量铅

Determination of Trace Lead in Alum by Flame Atomic Absorption Spectrophotometry after APDC Coprecipitation Concentration

本文研究了APDC－CU（Ⅱ）共沉淀分离富集，开槽管原子捕集火焰原子吸收光谱测定铅的条件，发现痕量铅在pH值为2－8的条件下能被APDC－Cu（Ⅱ）定量共沉淀，方法的检出限可达1．5×10－2μg／mL。用于明矾中痕量错的分离富集和测定，共存物质不产生干扰，样品6次平行测定的相对标准偏差＜4％。加标回收率在98％－103％之间。

In this paper,the conditions of determintation of Pb by STAT-FAAS after APDC-Cu(Ⅱ)coprecipitation concentration are studied. It is found that Pb (Ⅱ)can be quantitatively coprecipitated byAPDC-Cu(Ⅱ) with the pH value range of 2 to 8. The detection liimit is 1-.5×10-2μg/mL. No interference is observed from coexistent substances for the determination and concentration of Pb in alum.Te relative standard devtation of 6 repeated sample's measurements is <4 %. The recovery is 98% 103 %.