Effects of different treatments on soil-borne DDT and HCH dynamics and plant uptake

Li, Huashou and Ling, Weifeng and Lin, Chuxia (2011) Effects of different treatments on soil-borne DDT and HCH dynamics and plant uptake. Journal of Environmental Science and Health. Part B: Pesticides, Food Contaminants, and Agricultural Wastes, 46 (7). pp. 608-614. ISSN 0360-1234

Abstract

Pot experiments were conducted to examine the effects of various fertilizers, as well as soil dilution treatments on the dynamics of soil-borne DDTs [sum of dichlorodiphenyltrichloroethane (DDT), chlorodiphenyldichloroethylene (DDE) and dichlorodiphenyldichloroethane (DDD)] and hexachlorocyclohexanes (HCHs, sum of α-HCH, β-HCH, γ-HCH and δ-HCH) and their subsequent impacts on the uptake of DDTs and HCHs by a test plant. The results show that the soil residual DDTs and HCHs concentrations in the iron-rich fertilizer-treated soil were significantly lower than those in other fertilizer-treated soils. There was a close relationship between the soil residual DDTs and the plant tissue DDTs. This suggests that the uptake rate of DDTs by the plant was dependent on the concentration of soil-borne DDTs. A less close relationship between soil residual HCHs and plant tissue HCHs was also observed. Dilution of pesticide-contaminated soil with the non-contaminated soil not only physically reduced the concentration of pesticides in the soil but also enhanced the loss of soil-borne pesticides, possibly through the improvement of soil conditions for microbial degradation. Soil dilution had a better effect on promoting the loss of soil-borne HCHs, relative to soil-borne-DDTs. The research findings obtained from this study have implications for management of heavily contaminated soils with DDTs and HCHs. Remediation of DDTs and HCHs-contaminated soils in a cost-effective way can be achieved by incorporating treatment techniques into conventional agricultural practices. Applications of iron-rich fertilizer and soil dilution treatments could cost-effectively reduce soil-borne DDTs and HCHs, and subsequently the uptake of these organochlorine pesticides by vegetables.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version due to publisher copyright policy.
Depositing User: Dr Chuxia Lin
Faculty / Department / School: Historic - Faculty of Sciences - No Department
Date Deposited: 29 Jul 2011 02:04
Last Modified: 25 Aug 2014 04:01
Uncontrolled Keywords: fertilizer; DDT; HCH; pesticide; soil contamination; plant uptake
Fields of Research (FOR2008): 10 Technology > 1002 Environmental Biotechnology > 100203 Bioremediation
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079902 Fertilisers and Agrochemicals (incl. Application)
05 Environmental Sciences > 0503 Soil Sciences > 050302 Land Capability and Soil Degradation
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9612 Rehabilitation of Degraded Environments > 961202 Rehabilitation of Degraded Farmland, Arable Cropland and Permanent Cropland Environments
Identification Number or DOI: doi: 10.1080/03601234.2011.589313
URI: http://eprints.usq.edu.au/id/eprint/19440

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