Thorstensen C W, Lode O
The Norwegian Crop Research Institute, Plant Protection, As, Norway.
J Environ Qual. 2001 May-Jun;30(3):947-53. doi: 10.2134/jeq2001.303947x.
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.
在挪威土壤中进行了实验室降解研究，使用了两种商业配方（敌力脱和特立灵 - P），其中一种仅含丙环唑，另一种含有苯达松、二氯丙酸和灭草灵的组合。这些土壤包括来自霍勒的细砂壤土和来自克罗尔的壤土，这两种土壤均代表挪威农业土壤。第三种土壤是来自弗罗兰森林的高度分解的有机物质。来自斯库特鲁德流域的第四种土壤仅用于丙环唑的降解。84天后，在所有三种选定的土壤中，初始灭草灵浓度的残留量不到0.1%。对于二氯丙酸，在细砂壤土和富含有机质的土壤中得到了相同的结果，但在壤土中，初始浓度的26%仍有残留。84天后，富含有机质的土壤中苯达松初始浓度的残留量不到0.1%，但在壤土和细砂壤土中分别有52%和69%残留。丙环唑的持久性与其他农药不同。84天后，富含有机质的土壤、细砂壤土和壤土中初始浓度的残留量分别为40%、70%和8%。富含有机质的土壤对所有四种农药的分解能力最强。农业土壤和斯库特鲁德流域的结果表明，丙环唑的持久性较高。农药降解近似于一级动力学。降解速率缓慢，即在实验84天的持续时间后，超过50%的农药仍残留在土壤中，这与一级动力学不太相符。
