溶剂浮选-石墨炉原子吸收光谱法测定水样中痕量Pb(Ⅱ)、Ni(Ⅱ)和Co(Ⅱ)

Determination of Trace Pb(Ⅱ),Ni(Ⅱ) and Co(Ⅱ) in Water Samples by Solvent Floatation-GFAAS

本文采用溶剂浮选分离富集，石墨炉原子吸收光谱法测定水样中的痕量Pb（Ⅱ）、Ni（Ⅱ）以和Co（Ⅱ）。以双硫腙为捕集剂，甲基异丁基酮（MIBK）为浮选溶剂，确定了最佳浮选务件。所拟定的方法用于自来水和工业用水中Pb（Ⅱ）、Ni（Ⅱ）和Co（Ⅱ）的测定，金属离子的富集倍数为37，Pb（Ⅱ）、Ni（Ⅱ）和Co（Ⅱ）的检出限分别为0．2μg／L、1．08μg／L和0．38μg／L；样品加标回收率在94．7％～103．2％之间；测定结果的RSD≤4．67％。

The trace amounts of Pb（Ⅱ）,Ni（Ⅱ） and Co（Ⅱ） in solution were separated and enriched by solvent floatation,and were determined by GFAAS in this paper. Dithizone was used as a ligand and MIBK was selected as floatation solvent. The experimental parameters of solvent sublation and GFAAS determination were optimized. The proposed method was used to determine Pb（Ⅱ）, Ni（Ⅱ） and Co（Ⅱ） in real water samples. Enrichment multiples were 37. RSD was less than 4. 67%, detection limits were 0.2μg/L for Pb（Ⅱ）, 1.08μg/L for and recoveries ranged from 94.7% to 103.2%. The Ni（Ⅱ） and 0.38 μg/L for Co（Ⅱ） ,respectively.