Degradation and fate of 14C-ddt and 14C-DDE in Egyptian soil

Zayed, S. M. A. D.; Mostafa, I. Y.; El‐Arab, A.E.

doi:10.1080/03601239409372857

Cited by 17 publications

(11 citation statements)

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“…By contrast, minimal mineralisation (< 0.7% of added label) was detected under non-flooded conditions. Similar rates of mineralisation in soil have been reported for DDE (Zayed et al 1994;Boul 1996). Laboratory studies using sterile controls (Guenzi & Beard 1968;Boul 1996) indicate that the biotransformation and ultimately the mineralisation of DDTr to CO2 in soil are attributed to microbially mediated processes.…”

supporting

confidence: 83%

“…All these studies indicate that rates of DDT mineralisation in soils are very low. In general, less than 3.1% of the added label was released as 14 C-CO 2 after 42 days (Scheunert et al 1987;Nair et al 1992;Boul 1996) or longer incubations (Guenzi & Beard 1968;Zayed et al 1994). Furthermore, flooding the soils reduced 14 C-CO2 evolution (Nair et al 1992;Boul 1996).…”

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confidence: 99%

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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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supporting

confidence: 83%

mentioning

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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“…This indicates that most of DDT broke down under aerobic condition before depositing into sediments of Daliaohe River system. Because DDE is able to bind more strongly to soil than DDT (Hussain et al 1994;Zayed et al 1994), and p, p′-DDE is the dominant DDT metabolite in most of the sediments of the Daliaohe River system (Table 2), This also indicated that historical input of DDT into Daliohe River water system.…”

Section: Quality Assurancementioning

confidence: 91%

Monitoring and Assessment of Persistent Organochlorine Residues in Sediments from the Daliaohe River Watershed, Northeast of China

Wang

Lin

et al. 2007

Environ Monit Assess

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Surface sediment samples from 12 sites of the three selected rivers in Daliaohe River watershed (Hunhe River, Taizihe River and Daliaohe River) were analyzed with the objective of establishing sources and hazard of the organochlorinae pesticides (OCPs) and polychlorinated biphenyl (PCBs) in surface sediments. The total concentrations of OCPs varied from 3.06 to 23.24 ng g(-1). SigmaHCH (alpha-HCH, beta-HCH, delta-HCH, gamma-HCH), SigmaDDT (p, p'-DDE, p, p'-DDD, o, p'-DDT, p, p'-DDT) and SigmaCyclodiene (Heptachlor, Aldrin, Heptachlor epoxide, Dieldrin, Endrin) ranged from 1.86 to 21.48, 0.5 to 2.81 and 0.56 to 1.53 ng g(-1), respectively. Results of OCPs also illustrate that the most dominant pollutants among the OCPs was SigmaHCH, and gamma-HCH was the most dominant isomer in HCH, which was evidence of recent input of lindane. It possibly came from the runoff of polluted soils and long-scale transportation. Total PCB concentrations ranged between 1.88 and 16.88 ng g(-1). The peak concentrations of PCBs were found in sediments from station T5 and D3, which are in the vicinity of industrial areas and ferry, respectively. These data show a moderate level of OCPs and PCBs contaminations compared to that in other countries.

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“…However, such studies were invariably conducted with DDT emulsified in aqueous phase and in the presence of water miscible solvents to increase the bioavailability of DDTr. On the other hand, many other studies report that rates of DDT mineralization in soils is very slow (Guenzi and Beard, 1970;Zayed et al, 1994). In one study, less than 3.1% of radioactively labelled DDT adsorbed on soil was released as carbon dioxide after 42 d of incubation (Scheunert et al, 1987).…”

Section: Discussionmentioning

confidence: 96%