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Fractionation and elemental association of Zn, Cd and Pb in soils contaminated by Zn minings using a continuous-flow sequential extraction.
J Environ Monit. 2005 Aug; 7(8):778-84.JE

Abstract

Fractionation and elemental association of Zn, Cd, and Pb in soils near Zn mining areas were studied using a continuous-flow sequential extraction approach. The recently developed sequential extraction procedure not only gave fractional distribution data for evaluation of the mobility or potential environmental impact of the metals, but also the extraction profiles (extractograms) which were used for study of elemental association. In addition, the elemental atomic ratio plot extractogram can be used to demonstrate the degree of anthropogenic contamination. Seventy-nine soil samples were collected in the vicinity of a Zn mine and were fractionated into 4 phases i.e. exchangeable (F1), acid soluble (F2), reducible (F3) and oxidizable (F4) phases. Most samples were contaminated with Zn, Cd and Pb. The reducible phase is the most abundant fraction for Zn and Pb (>50%) while Cd is concentrated in the first 3 extraction steps. The distribution patterns of Cd were obviously affected by soil pH. 55% of Cd appears predominantly in the F1 fraction for acidic soils while in neutral and alkaline soils, it was mostly (70%) found in the F2 + F3 fractions. The extractograms obtained from the continuous-flow extraction system revealed close association between Zn, Cd, Pb and Fe in the acid soluble phase, Cd-Pb and Zn-Fe in the reducible phase for contaminated soils. A correlation study of the 3 metals using a correlation coefficient was also performed to compare the results with the elemental association revealed by the extractograms. Atomic ratio plot extractograms of Zn/Fe, Cd/Fe and Pb/Fe in the reducible phase, where contaminated metals are predominant, can be used to evaluate the degree of anthropogenic contamination. From the elemental atomic ratio plot, it is obvious that the contaminants Cd and Pb are mostly adsorbed on the surface of Fe oxides. Zn, which is present in an approximately 1 ratio 1 ratio with Fe in contaminated soils, does not show a similar trend to that found for Cd and Pb.

Authors+Show Affiliations

Department of Chemistry, Faculty of Science, Mahidol University, Bangkok, Thailand.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16049578

Citation

Buanuam, Janya, et al. "Fractionation and Elemental Association of Zn, Cd and Pb in Soils Contaminated By Zn Minings Using a Continuous-flow Sequential Extraction." Journal of Environmental Monitoring : JEM, vol. 7, no. 8, 2005, pp. 778-84.
Buanuam J, Shiowatana J, Pongsakul P. Fractionation and elemental association of Zn, Cd and Pb in soils contaminated by Zn minings using a continuous-flow sequential extraction. J Environ Monit. 2005;7(8):778-84.
Buanuam, J., Shiowatana, J., & Pongsakul, P. (2005). Fractionation and elemental association of Zn, Cd and Pb in soils contaminated by Zn minings using a continuous-flow sequential extraction. Journal of Environmental Monitoring : JEM, 7(8), 778-84.
Buanuam J, Shiowatana J, Pongsakul P. Fractionation and Elemental Association of Zn, Cd and Pb in Soils Contaminated By Zn Minings Using a Continuous-flow Sequential Extraction. J Environ Monit. 2005;7(8):778-84. PubMed PMID: 16049578.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fractionation and elemental association of Zn, Cd and Pb in soils contaminated by Zn minings using a continuous-flow sequential extraction. AU - Buanuam,Janya, AU - Shiowatana,Juwadee, AU - Pongsakul,Pichit, Y1 - 2005/06/14/ PY - 2005/7/29/pubmed PY - 2006/1/28/medline PY - 2005/7/29/entrez SP - 778 EP - 84 JF - Journal of environmental monitoring : JEM JO - J Environ Monit VL - 7 IS - 8 N2 - Fractionation and elemental association of Zn, Cd, and Pb in soils near Zn mining areas were studied using a continuous-flow sequential extraction approach. The recently developed sequential extraction procedure not only gave fractional distribution data for evaluation of the mobility or potential environmental impact of the metals, but also the extraction profiles (extractograms) which were used for study of elemental association. In addition, the elemental atomic ratio plot extractogram can be used to demonstrate the degree of anthropogenic contamination. Seventy-nine soil samples were collected in the vicinity of a Zn mine and were fractionated into 4 phases i.e. exchangeable (F1), acid soluble (F2), reducible (F3) and oxidizable (F4) phases. Most samples were contaminated with Zn, Cd and Pb. The reducible phase is the most abundant fraction for Zn and Pb (>50%) while Cd is concentrated in the first 3 extraction steps. The distribution patterns of Cd were obviously affected by soil pH. 55% of Cd appears predominantly in the F1 fraction for acidic soils while in neutral and alkaline soils, it was mostly (70%) found in the F2 + F3 fractions. The extractograms obtained from the continuous-flow extraction system revealed close association between Zn, Cd, Pb and Fe in the acid soluble phase, Cd-Pb and Zn-Fe in the reducible phase for contaminated soils. A correlation study of the 3 metals using a correlation coefficient was also performed to compare the results with the elemental association revealed by the extractograms. Atomic ratio plot extractograms of Zn/Fe, Cd/Fe and Pb/Fe in the reducible phase, where contaminated metals are predominant, can be used to evaluate the degree of anthropogenic contamination. From the elemental atomic ratio plot, it is obvious that the contaminants Cd and Pb are mostly adsorbed on the surface of Fe oxides. Zn, which is present in an approximately 1 ratio 1 ratio with Fe in contaminated soils, does not show a similar trend to that found for Cd and Pb. SN - 1464-0325 UR - https://www.unboundmedicine.com/medline/citation/16049578/Fractionation_and_elemental_association_of_Zn_Cd_and_Pb_in_soils_contaminated_by_Zn_minings_using_a_continuous_flow_sequential_extraction_ DB - PRIME DP - Unbound Medicine ER -