Dissipation and degradation of DDT and DDE in Philippine soil under field conditions

Varca, Leonila M.; Magallona, E.D.

doi:10.1080/03601239409372855

Cited by 19 publications

(8 citation statements)

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“…Once bound to soil organic matter, pesticide residues are only slowly released. Nevertheless, DDT residues could be released by addition of fresh soil (Hussain et al 1994;Varca & Magallona 1994;Xu et al 1994) which is indicative of a microbially mediated mechanism. Likewise, chemical pre-treatment of contaminated soils may enhance the release of bound DDTr.…”

Section: Environmental Factors Limiting Biodegradation Of Ddtr In Soilmentioning

confidence: 99%

Microbial degradation of DDT and its residues—A review

Aislabie

Richards

Boul

1997

New Zealand Journal of Agricultural Research

247

140

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Microbial degradation of DDT residues is one mechanism for loss of DDT from soil. In this review pathways for biodegradation of DDT, DDD, and DDE by bacteria and fungi are described. Biodegradation of DDT residues can proceed in soil, albeit at a slow rate. To enhance degradation in situ a number of strategies are proposed. They include the addition of DDT-metabolising microbes to contaminated soils and/or the manipulation of environmental conditions to enhance the activity of these microbes. Ligninolytic fungi and chlorobiphenyl degrading bacteria are promising candidates for remediation. Flooding of soil and the addition of organic matter can enhance DDT degradation. As biodegradation may be inhibited by lack of access of the microbe to the contaminant, the soil may need to be pre-treated with a surfactant. Unlike DDT, little is known about the biodegradation of DDE, and this knowledge is crucial as DDE can be the predominant residue in some soils.

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Section: Environmental Factors Limiting Biodegradation Of Ddtr In Soilmentioning

confidence: 99%

Microbial degradation of DDT and its residues—A review

Aislabie

Richards

Boul

1997

New Zealand Journal of Agricultural Research

247

140

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“…The overall half-life for DDT dissipation in water was 31 d (Varca 1996). In Philippine soils, Varca and Magallona (1994) found the half-lives of 14 C-DDT and 14 C-DDE were 105 and 151 d, respectively and concluded that p,p´-DDT and p,p´-DDE dissipate from Philippine soils at rates that may preclude accumulation of residues.…”

Section: Ecotoxicology Of Pesticides In Philippine Aquatic Ecosystemsmentioning

confidence: 97%

Ecotoxicology of pesticides in Philippine aquatic ecosystems

Bajet¹

2002

Pesticide Residues in Coastal Tropical Ecosystems

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“…␣-, ␤-, ␥-, and ␦-HCH were also detected and ranged from 3.3 to 130 ng/m 3 . The more rapid dissipation of DDT in the tropics is also illustrated by the recorded half-life of this insecticide, 10 years in the temperate zone compared to between 6 months and 1 year in the tropical zone [20].…”

Section: Volatilizationmentioning

confidence: 97%

Ecotoxicology of Pesticides in the Tropical Paddy Field Ecosystem

Abdullah

Bajet

Matin

et al. 1997

Environ Toxicol Chem

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Abstract-In tropical countries rice has been identified as one of the crops that is particularly susceptible to the negative impacts of pesticide use. In addition to the physicochemical nature of the pesticide, tropical climatic conditions and agricultural practices play important roles in determining the fate and distribution of pesticides in the tropical paddy field ecosystem. The assessment of ecotoxicological effects of pesticides in the tropical paddy field ecosystem has been based primarily on acute lethality tests conducted on fish species commonly found in paddy fields. The effects of pesticides in the paddy field ecosystem on other nontarget organisms ranging from microalgae and cyanobacteria to paddy field crabs have also been investigated, although such studies are limited. As a means to promote a more judicious use of pesticides in the paddy field, the adoption of integrated pest management strategies have resulted in varying degrees of success. The most widely accepted form of control measure is the integration of multiresistant cultivars with reduced use of pesticides. Effective training of the paddy farmer has been identified as the key to successful implementation of integrated pest management strategies.

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Dissipation and degradation of DDT and DDE in Philippine soil under field conditions

Cited by 19 publications

References 0 publications

Microbial degradation of DDT and its residues—A review

Microbial degradation of DDT and its residues—A review

Ecotoxicology of pesticides in Philippine aquatic ecosystems

Ecotoxicology of Pesticides in the Tropical Paddy Field Ecosystem

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