Effect of pH on the degradation of atrazine, dichlorprop, linuron and propyzamide in soil

Hance, R. J.

doi:10.1002/ps.2780100111

Cited by 27 publications

(9 citation statements)

References 19 publications

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“…A faster degradation of dichlorprop, MCPA, and propiconazole in the Hole fine sandy loam compared with the Kroer loam may be explained by a higher pH and lower organic content in the loam. Increased degradation at higher pH has been indicated by others (Hance, 1979; Torstensson et al, 1975). The fastest degradation occurred in the organic‐rich soil from Froland.…”

Section: Resultssupporting

confidence: 56%

Laboratory Degradation Studies of Bentazone, Dichlorprop, MCPA, and Propiconazole in Norwegian Soils

Thorstensen¹,

Lode²

2001

J of Env Quality

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Laboratory degradation studies were performed in Norwegian soils using two commercial formulations (Tilt and Triagran-P) containing either propiconazole alone or a combination of bentazone, dichlorprop, and MCPA. These soils included a fine sandy loam from Hole and a loam from Kroer, both of which are representative of Norwegian agricultural soils. The third soil was a highly decomposed organic material from the Froland forest. A fourth soil from the Skuterud watershed was used only for propiconazole degradation. After 84 d, less than 0.1% of the initial MCPA concentration remained in all three selected soils. For dichlorprop, the same results were found for the fine sandy loam and the organic-rich soil, but in the loam, 26% of the initial concentration remained. After 84 d, less than 0.1% of the initial concentration of bentazone remained in the organic-rich soil, but in the loam and the fine sandy loam 52 and 69% remained, respectively. Propiconazole was shown to be different from the other pesticides by its persistence. Amounts of initial concentration remaining varied from 40, 70, and 82% in the reference soils after 84 d for the organic-rich soil, fine sandy loam, and loam, respectively. The organic-rich soil showed the highest capacity to decompose all four pesticides. The results from the agricultural soils and the Skuterud watershed showed that the persistence of propiconazole was high. Pesticide degradation was approximated to first-order kinetics. Slow rates of degradation, where more than 50% of the pesticide remained in the soil after the 84-d duration of the experiment, did not fit well with first-order kinetics.

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Section: Resultssupporting

confidence: 56%

Laboratory Degradation Studies of Bentazone, Dichlorprop, MCPA, and Propiconazole in Norwegian Soils

Thorstensen¹,

Lode²

2001

J of Env Quality

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“…This shows a considerable involvement of microbial activity in soil indicated by the gradual disappearance of the residue in sterilized soil, in line with other previous reports. [10,11] Chemical hydrolysis of sulfonylurea herbicides is particularly important at low soil pH [10] with faster degradation at lower pH values. [9] The results of this experiment indicate that degradation could still occur in the sterilized soil in spite of the fact that moisture and temperature did not influence the persistence of metsulfuron.…”

Section: Discussionmentioning

confidence: 99%

Persistence and Bioactivity of Metsulfuron-Methyl in Three Soils

Ismail

Azlizan

2002

Journal of Environmental Science and Health, Part B

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The persistence of metsulfuron-methyl (methyl 2-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)aminocarbonyl]aminosul fonyl]benzoate) in nonautoclaved and autoclaved Selangor, Lating, and Serdang series soils incubated at different temperatures and with different moisture contents was investigated under laboratory conditions using cucumber (Cucumis sativus L.) as the bioassay species. Significant degradation of metsulfuron-methyl was observed in nonautoclaved soil compared with the autoclaved soil sample, indicating the importance of microorganisms in the breakdown process. At higher temperatures the degradation rate in nonautoclaved soil improved with increasing soil moisture content. In nonautoclaved Selangor, Lating and Serdang series soils, the half-life was reduced from 4.79 to 2.78 days, 4.9 to 3.5, and from 3.3 to 1.9 days, respectively, when the temperature was increased from 20 degrees to 30 degrees C at 80% field capacity. Similarly, in nonautoclaved soil, the half-life decreased with an increasing soil moisture from 20% to 80% at 30 degrees C in the three soils studied. In the autoclaved soil, the half-life values were slightly higher than those obtained in the nonautoclaved soils, perhaps indicating that the compound may be broken down by nonbiological processes. The fresh weight of the bioassay species was reduced significantly in Serdang series soil treated with metsulfuron-methyl at 0.1 ppm. However, the reduction in fresh weight of the seedlings was least in Lating series soil, followed by Selangor series soil.

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“…In soils, atrazine degradation rates generally increase with increasing temperature, moisture content, and clay content. Atrazine degradation is relatively insensitive to pH (Hance, 1979). Interactions between these factors are complicated however, because chemical hydrolysis and microbial desalkylation are affected differently and sometimes inversely.…”

Section: Parameter Estimates and Model Sensitivitymentioning

confidence: 99%

Assessment of ground-water vulnerability to atrazine leaching in Kent County, Michigan; review, comparison of results of other studies and verification

Holtschlag¹,

Luukkonen²

1998

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Effect of pH on the degradation of atrazine, dichlorprop, linuron and propyzamide in soil

Cited by 27 publications

References 19 publications

Laboratory Degradation Studies of Bentazone, Dichlorprop, MCPA, and Propiconazole in Norwegian Soils

Laboratory Degradation Studies of Bentazone, Dichlorprop, MCPA, and Propiconazole in Norwegian Soils

Persistence and Bioactivity of Metsulfuron-Methyl in Three Soils

Assessment of ground-water vulnerability to atrazine leaching in Kent County, Michigan; review, comparison of results of other studies and verification

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