Ultra-trace determination of Hg(ii) in drinking water and local Thai liquors using homogeneous liquid–liquid extraction followed by fluorescence quenching of its ternary complex

2013 ◽  
Vol 5 (4) ◽  
pp. 987-997 ◽  
Author(s):  
Bhuchonk Panichlertumpi ◽  
Saksit Chanthai
Keyword(s):  
Drinking Water ◽  
Fluorescence Quenching ◽  
Ternary Complex ◽  
Liquid Extraction ◽  
Trace Determination ◽  
Homogeneous Liquid ◽  
Liquid Liquid Extraction ◽  
Ultra Trace

Ultra-trace determination of Pb(II) and Cd(II) in drinking water and alcoholic beverages using homogeneous liquid-liquid extraction followed by flame atomic absorption spectrometry

2014 ◽  
Vol 68 (3) ◽  
Author(s):  
Samat Kinaree ◽  
Saksit Chanthai
Keyword(s):  
Drinking Water ◽  
Atomic Absorption Spectrometry ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Liquid Extraction ◽  
Flame Atomic Absorption ◽  
Liquid Liquid Extraction ◽  
Distilled Spirits ◽  
Ultra Trace

AbstractThe determination of Pb(II) and Cd(II) in different sample matrices, including drinking water, distilled spirits and fruit wine, was carried out by flame atomic absorption spectrometry (FAAS) after pre-concentration using homogeneous liquid-liquid extraction (HLLE). First, the HLLE method was optimised with lead diethyldithiocarbamate (Pb-DDTC) complex which was extracted with a perfluorooctanoate anion (PFOA−) dissolved in lithium hydroxide under acidic conditions. The optimum extraction conditions, using 0.01 M DDTC, 0.05 M PFOA−, 3 M HCl and 1 mL of 30 vol. % acetone, were obtained. The Pb-DDTC complex in the nitric acid digest of the samples (50–150 mL) was extracted quantitatively into a drop of 100 μL of sediment phase. The sediment phase dissolved in 1 vol. % HNO3 with at least 3–5 mL of the final volume was then determined by FAAS, affording a pre-concentration factor of 10–50. Hence, the HLLE method afforded an increase in both sensitivity and selectivity for the metal determination by conventional FAAS, resulting in ultra-trace level detection of Pb(II) in all samples analysed (drinking water, 9.2–23 ng mL−1; distilled spirits, 23–50 ng mL−1; fruit wine, 24–53 ng mL−1). In addition, the proposed method could successfully be applied to Cd(II) determination in these samples.

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