Journal
MICROCHIMICA ACTA
Volume 171, Issue 3-4, Pages 313-319Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-010-0429-7
Keywords
Cloud point extraction; Mercury; Atomic fluorescence spectrometry
Categories
Funding
- State Key Laboratory of Environmental Chemistry and Ecotoxicology
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences [KF2008-01]
- Fundamental Research Funds for the Central Universities [10ZG01]
- Program for New Century Excellent Talents in University [NCET-10-0341]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [[2009]1001]
- Natural Science Foundation of Hebei Province [B2010001676]
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A sensitive method is presented for the determination of ultra-trace levels of mercury using cold vapor atomic fluorescence spectrometry along with cloud point extraction. Preconcentration is based on the complexation of Hg(II) by dithizone, followed by micelle-mediated extraction of the complex using the surfactant Triton X-114. Foaming, which is always observed when generating vapor mercury in the presence of surfactant, was strongly reduced by using SnCl(2) as a reducing reagent, and a homemade gas-liquid separator. Variables that affect the assay were optimized. These included pH value, concentration of chelating reagent, concentration of Triton X-114, equilibration temperature and time. The preconcentration of a 45-mL sample gave an enhancement factor of 29. The calibration graph is linear in the range from 0.05 to 5.0 ngmL(-1) with a correlation coefficient of 0.9991. The limit of detection (3 delta) obtained under the optimal conditions is 5 pgmL(-1). The relative standard deviation for seven replicate determinations at 0.5 ngmL(-1) level is 5.2%. The method was successfully applied to the determination of Hg in real samples.
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