title: An exploration of the relationship between adsorption and bioavailability of pesticides in soil to earthworm.
abstract: A study was conducted to determine the adsorption/desorption of butachlor, myclobutanil and chlorpyrifos on five soils using a batch equilibration technique and to study the relationship between bioavailability to Allolobophora caliginosa and the adsorption/desorption of these three pesticides. The results showed that the adsorption/desorption processes of the tested compounds were mainly controlled by soil organic matter content (OM) and octanol/water-partitioning coefficient (K(ow)), and that the bioavailability of the pesticides was dependent on characteristics of pesticides, properties of soils, and uptake routes of earthworms. Bioconcentration of butachlor and myclobutanil was negatively correlated with Freundlich adsorption constant K(af) and K(df). However, only a slightly positive correlation between bioconcentration and K(af) and K(df) was observed for chlorpyrifos due to its high affinity onto soil.
authors.affiliation: Department of Plant Protection, Zhejiang University, Kaixuan Road 268, Hangzhou, Zhejiang 310029, China. ylyu@zju.edu.cn
authors.forename: Yun Long
authors.initials: YL
authors.lastname: Yu
authors.forename: Xiao Mao
authors.initials: XM
authors.lastname: Wu
authors.forename: Shao Nan
authors.initials: SN
authors.lastname: Li
authors.forename: Hua
authors.initials: H
authors.lastname: Fang
authors.forename: Hai Yan
authors.initials: HY
authors.lastname: Zhan
authors.forename: Jing Quan
authors.initials: JQ
authors.lastname: Yu
mesh_terms: D000083:Acetanilides / Q000633:toxicity; D000327:Adsorption; D000818:Animals; D001682:Biological Availability; D004390:Chlorpyrifos / Q000633:toxicity; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000633:toxicity*; D006812:Humic Substances; D009570:Nitriles / Q000633:toxicity; D009835:Oligochaeta / Q000378:metabolism; D010575:Pesticides / Q000633:toxicity*; D012989:Soil Pollutants / Q000633:toxicity; D018675:Toxicity Tests; D014230:Triazoles / Q000633:toxicity; D014873:Water Pollutants / Q000633:toxicity
chemical_list: D000083:Acetanilides; D004785:Environmental Pollutants; D006812:Humic Substances; D009570:Nitriles; D010575:Pesticides; D012989:Soil Pollutants; D014230:Triazoles; D014873:Water Pollutants; C054409:butachlor; C446685:systhane; D004390:Chlorpyrifos