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Determination of Trace Mercury by Cloud Point Extraction Preconcentration Coupled with Spectrophotometry

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Author(s): Mahmoud Reza Sohrabi | Elham Farokhi | Atena Adnani | Mona Ziaian

Journal: Journal of Applied Sciences
ISSN 1812-5654

Volume: 7;
Issue: 20;
Start page: 3123;
Date: 2007;
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Keywords: spectrophotometry | mercury determination | Cloud point extraction | Triton X-100

ABSTRACT
A new micell-mediated phase separation method for preconcentration of ultra-trace quantities of mercury as a prior step to its determination spectrophotometry has been developed. The method is based on the Cloud Point Extraction (CPE) of mercury with Triton X-100 in the absence of chelating agent. Mercury react with sodium diethyldithiocarbamate (DDTC) in a surfactant solution yielding a hydrophobic complex, which then is entrapped in surfactant micelles. Separation of the two phases was accomplished by centrifugation for 10 min at 4000 rpm. Under the optimum conditions i.e., pH 9.0, cloud point temperature 45°C, [DDTC] = 1.6x10-5 mol L-1, [Triton X-114] = 0.032%. Analytical graphs were rectilinear in the concentration range of 4-240 µg L-1 and relative standard deviation for five replicate determinations of Mercury at 8 (μg L-1) concentration level, were 1.9%, respectively (n = 5, c = 8 µg L-1).
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