Simultaneous preconcentration of cadmium and lead in water samples with silica gel and determination by flame atomic absorption spectrometry |
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| Authors: | Hongbo Xu Yun Wu Jian Wang Xuewei Shang Xiaojun Jiang |
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| Institution: | 1. Environmental Engineering Program, Department of Biomedical, Chemical, and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, United States;2. Program of Civil Engineering, California State Poly Pomona, Pomona, CA 91768, United States;3. Program of Information Technology & Management, Illinois Institute of Technology, Chicago, IL 60647, United States;1. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, South Africa;2. Center for HIV and STIs, National Institute for Communicable Disease, National Health Laboratory Service, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa;3. Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, University of Cape Town, South Africa;4. National Health Laboratory Service, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa;1. Department of Environmental Engineering, School of Energy, Environmental, Chemical and Petrochemical, Egypt-Japan University of Science and Technology (E-Just), New Borg El Arab City, 21934, Alexandria, Egypt;2. Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan;1. Dept. of Biochemistry, Capital Institute of Pediatrics, Beijing 100020, China;2. Dept. of Biochemistry, Capital Institute of Pediatrics-Peking University Teaching Hospital, Beijing 100020, China;3. Graduate School, Chinese Academy of Medical Science, Beijing 100730, China |
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| Abstract: | A new method that utilizes pretreated silica gel as an adsorbent has been developed for simultaneous preconcentration of trace Cd(II) and Pb(II) prior to the measurement by flame atomic absorption spectrometry. The effects of pH, the shaking time, the elution condition and the coexisting ions on the separation/preconcentration conditions of analytes were investigated. Under optimized conditions, the static adsorption capacity of Cd(II) and Pb(II) were 45.5 and 27.1mg/g, the relative standard deviations were 3.2% and 1.7% (for n = 11), and the limits of detection obtained were 4.25 and 0.60 ng/mL, respectively. The method was validated by analyzing the certified reference materials GBW 07304a (stream sediment) and successfully applied to the analysis of various treated wastewater samples with satisfactory results. |
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| Keywords: | silica gel lead cadmium preconcentration flame atomic absorption spectrometry (FAAS) |
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