Pedosphere 19(4): 476--485, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Comparison of different extraction approaches for heavy metal partitioning in sediment samples
M. B. ARAIN1, T. G. KAZI1, M. K. JAMALI1,2, J. A. BAIG1, H. I. AFRIDI1, N. JALBANI1,3 and R. A. SARFRAZ1
1 National Centre of Excellence in Analytical Chemistry, Sindh University, Jamshoro 76080 (Pakistan)
2 Government Degree College, Usta Mohammad, Balochistan 80300 (Pakistan)
3 Pakistan Council for Scientific and Industrial Research, University Road, Karachi 75280 (Pakistan)
      Three extraction methods, ultrasonic assisted extraction (USE), microwave assisted extraction (MSE), and conventional single extraction (CSE), in conjunction with the modified three-stage BCR sequential extraction procedure (SEP) were applied to examine the contents of Cd, Cu, Cr, Ni, Pb and Zn from lake sediment samples, to know whether these techniques can reduce extraction time and improve reproducibility. The SEP and developed alternative single extraction methods were validated by the analysis of certified reference material BCR 601. By the use of optimized sonication and microwave conditions, steps 1, 2 and 3 of the BCR sequential extraction methods (excluding the hydrogen peroxide digestion in step 3, which was not performed with sonication and microwave) could be completed in 15-30 min and 60- 150 s, respectively. The recoveries of total extractable metal contents in BCR 601, obtained by three single extractions ranged from 93.3%-102%, 88.9%-104% and 81.2%-96.2% for CSE, USE and MSE, respectively. The precision of the single extraction methods was found in the range of 3.7%-9.4% for all metals (n = 6).
Key Words:  heavy metals, lake sediment, microwave single extraction, modified BCR sequential extraction, ultrasonic single extraction
Citation: Arain, M. B., Kazi, T. G., Jamali, M. K., Baig, J. A., Afridi, H. I., Jalbani, N. and Sarfraz, R. A. 2009. Comparison of different extraction approaches for heavy metal partitioning in sediment samples. Pedosphere. 19(4): 476-485.
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