Factors Influencing Degradation of Pesticides in Soil

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• 作者：Melanie Kah ; Sabine Beulke ; Colin D. Brown
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：May 30, 2007
• 年：2007
• 卷：55
• 期：11
• 页码：4487 - 4492
• 全文大小：50K
• 年卷期：v.55,no.11(May 30, 2007)
• ISSN：1520-5118

文摘

Degradation and sorption of six acidic pesticides (2,4-D, dicamba, fluroxypyr, fluazifop-P, metsulfuron-methyl, and flupyrsulfuron-methyl) and four basic pesticides (metribuzin, terbutryn, pirimicarb, andfenpropimorph) were determined in nine temperate soils. Results were submitted to statistical analysesagainst a wide range of soil and pesticide properties to (i) identify any commonalities in factorsinfluencing rate of degradation and (ii) determine whether there was any link between sorption anddegradation processes for the compounds and soils studied. There were some marked differencesbetween the soils in their ability to degrade the different pesticides. The parameters selected to explainvariations in degradation rates depended on the soil-pesticide combination. The lack of consistentbehavior renders a global approach to prediction of degradation unrealistic. The soil organic carboncontent generally had a positive influence on degradation. The relationship between pH anddegradation rates depended on the dominant mode of degradation for each pesticide. There werepositive relationships between sorption and rate of degradation for metsulfuron-methyl, pirimicarb,and all acidic pesticides considered together (all P < 0.001) and for dicamba and all bases consideredtogether (P < 0.05). No relationship between these processes was observed for the remaining sevenindividual pesticides.