Preconcentration of gold ions from water samples by modified organo-nanoclay sorbent prior to flame atomic absorption spectrometry determination

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作者：

D Afzali，rnAli Mostafavi，rnMohammad Mirzaei

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摘要：

In this work, the applicability of modified organo nanoclay as a new and easy prepared solid sorbent for the preconcentration of trace amounts of Au(III) ion from water samples is studied. The organo nanoclay was modified with 5-(4′-dimethylamino benzyliden)-rhodanine and used as a sorbent for separation of Au(III) ions. The sorption of gold ions was quantitative in the pH range of 2.0–6.0. Quantitative desorption occurred with 6.0mL of 1.0molL 1 Na 2 S 2 O 3 . The amount of eluted Au(III) was measured using flame atomic absorption spectrometry. In the initial solution the linear dynamic range was in the range of 0.45ngmL 1 to 10.0μgmL 1 , the detection limit was 0.1ngmL 1 and the preconcentration factor was 105. Also, the relative standard deviation was ±2.3% ( n =8 and C =2.0μgmL 1 ) and the maximum capacity of the sorbent was 3.9mg of Au(III) per gram of modified organo nanoclay. The influences of the experimental parameters including sample pH, eluent volume and eluent type, sample volume, and interference of some ions on the recoveries of the gold ion were investigated. The proposed method was applied for preconcentration and determination of gold in different samples.

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关键词：

nanoclay sorbent preconcentration gold determination 5-(4'-simethylamino benzyliden)-rhodanine

DOI：

10.1016/j.jhazmat.2010.05.106

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年份：

2010