Fate of organophosphorus pesticides in soils

Sattar, Mohammed

doi:10.1016/0045-6535(90)90069-6

Cited by 23 publications

(6 citation statements)

References 11 publications

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“…Corresponding DT 50 values found in the topsoils from both Waikiwi and Motupiko were lower than the reported half-lives for the compound elsewhere. Sattar [27] reported mean T 1/2 for diazinon as 28 days and 36 days, in a silty clay (OC = 0.6%) and a sandy clay (OC = 0.5%) soil respectively. The author incubated at a much higher temperature (25 • C) than the present study, and the soils had much lower organic carbon content, which may explain higher T 1/2 values for the compound in those soils.…”

Section: Diazinonmentioning

confidence: 99%

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Sarmah¹,

Close²,

Mason³

2009

Journal of Environmental Science and Health, Part B

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We investigated dissipation and sorption of atrazine, terbuthylazine, bromacil, diazinon, hexazinone and procymidone in two contrasting New Zealand soils (0-10 cm and 40-50 cm) under controlled laboratory conditions. The six pesticides showed marked differences in their degradation rates in both top-and subsoils, and the estimated DT 50 values for the compounds were: 19-120 (atrazine), 10-36 (terbuthylazine), 12-46 (bromacil), 7-25 (diazinon), 8-92 (hexazinone) and 13-60 days for procymidone. Diazinon had the lowest range for DT 50 values, while bromacil and hexazinone gave the highest DT 50 values under any given condition on any soil type. Batch derived effective distribution coefficient (K eff d ) values for the pesticides varied markedly with bromacil and hexazinone exhibiting low sorption affinity for the soils at either depth, while diazinon gave high sorption values. Comparison of pesticide degradation in sterile and non-sterile soils suggests that microbial degradation was the major dissipation pathway for all six compounds, although little influence of abiotic degradation was noticeable for diazinon and procymidone.

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Section: Diazinonmentioning

confidence: 99%

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Sarmah¹,

Close²,

Mason³

2009

Journal of Environmental Science and Health, Part B

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“…Usually, they are known as nonpersistent agrochemicals and, in comparison with organochlorine insecticides, they have lower residual effects on terrestrial and aquatic ecosystems. The degradation process of organophosphorus insecticides is generally faster in respect to other organochlorines or carbamate agrochemicals (Sattar 1990). However, the phosphorodithioate category includes insecticides with different physic-chemical characteristics.…”

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confidence: 99%

Acute Toxicity of Organophosphorus Insecticides to Marine Invertebrates

Guzzella

Gronda

Colombo

1997

Bulletin of Environmental Contamination and Toxicology

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“…In cultivated regions, soils and streams play an important role in the transport and fate of pesticides used in crops and farms. There, pesticides can undergo several processes such as adsorption, leaching, run-off, volatilization, and degradation (biotic or abiotic) affecting the environmental concentrations [6,7,8]. DDVP has a short half-lifetime in freshwater (2.8 days at pH=7 and 20°C) [9] and soils (4 days at pH= 6.2-7.4 and 25°C) [10].…”

Section: Introductionmentioning

confidence: 99%

Movement of Dichlorvos in Farm Soils: Batch and Column Studies.

Bustos

Grassi

Cirelli

et al. 2020

Preprint

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Soils are the principal environmental fate of pesticides in agricultural areas. Thus, the kinetics, extension, and strength of the adsorption process become critical. Dichlorvos (DDVP) is an organophosphorous pesticide that is used both in agriculture and livestock production. Sorption/desorption assays of DDVP in two agricultural soils (with different textural characteristics) from Pampa Plain (Argentina) were performed in both batch and column systems. From batch studies, kinetics and sorption/desorption equilibrium parameters were estimated. Our results showed that the maxima adsorption is reached after 30 h of time of contact and followed a pseudo-first-order rate. Adsorption/desorption data were well fitted to the Freundlich model obtaining high adsorption constants of 90 mg(1-1/n) mL(1/n) g-1 and 21 mg(1-1/n) mL(1/n) g-1 for the clay loam and sandy loam soil, respectively. The isotherms were non-linear in both cases and the desorption process was unfavourable. Also, positive hysteresis was present for the sandy loam soil. From column studies, breakthrough curves were used to evaluate the mobility of DDVP in the soils at 1, 10, and 50 mg L-1 of DDVP. Eluted profiles were asymmetrical as well they presented retardation effects that were in connection with the results in batch conditions. Non-equilibrium sorption was stated for the DDVP movement through columns. Thus, high mobility was observed for DDVP in both soils despite their textural differences.

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Fate of organophosphorus pesticides in soils

Cited by 23 publications

References 11 publications

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Acute Toxicity of Organophosphorus Insecticides to Marine Invertebrates

Movement of Dichlorvos in Farm Soils: Batch and Column Studies.

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