Effects of Pine Bark Compost on the Distribution of Cd and Pb in Organic Fractions over Time in Contaminated Soils
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17, Issue 1
Abstract
Heavy metal contamination in rural soils severely threatens the food chain, and consequently, human health. The addition of organic amendments to contaminated soils is considered an effective method to immobilize heavy metals. However, the sequential decomposition of soil organic matter still poses a risk, the rerelease of heavy metals, to animals and plants. This study aims to determine the amount of Cd and Pb in different organic fractions including dissolved organic matter, humic acid (HA), fulvic acid (FA), and residual fraction after the addition of a pine bark compost to tropical acidic soils. Four controlled samples, contaminated to 20, 40, 60, and for Cd, and 200, 400, 600, and for Pb, were used in this study. The soil samples, both with and without the pine bark compost, were incubated for 120 days for further analysis. The results of the sequential extraction of organic matter indicated that the proportions of Cd and Pb were transferred from the residual fraction into the soluble HA and FA fractions after the compost was mixed into the soil. Additionally, the proportion of Cd in the soluble fraction and Pb in the HA and FA fractions elevated as incubation time increased, indicating the gradual decomposition of residual fractions and more available Cd and Pb in the soil. The diethylene triamine pentaacetic acid extraction result revealed an increased bioavailability of Cd and Pb after the addition of the compost that gradually increased as the organic matter in the amended soils decomposed further. The results demonstrated that the application of pine bark compost to the soil increased the proportions of Cd in soluble fractions and Pb in humic fractions. Furthermore, the results confirmed the potential risk of bioavailable Cd and Pb rereleasing into the amended soil over time.
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Acknowledgments
The authors would like to thank the National Science Council of Taiwan for financially supporting this research under Contract No. NSC 95-2221-E-020-019. The author also appreciated Miss Y. S. Chang for her help in the field sampling and laboratory analysis.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17 • Issue 1 • January 2013
Pages: 38 - 44
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 11, 2011
Accepted: Mar 15, 2012
Published online: Mar 19, 2012
Published in print: Jan 1, 2013
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