Adsorption, desorption and dissipation of metolachlor in surface and subsurface soils
文献类型：期刊论文
| 作者 | Si, Youbin1,2,3; Takagi, Kazuhiro1; Iwasaki, Akio4; Zhou, Dongmei3 |
| 刊名 | PEST MANAGEMENT SCIENCE
 |
| 出版日期 | 2009-09-01 |
| 卷号 | 65期号:9页码:956-962 |
| 关键词 | metolachlor adsorption desorption degradation surface soil subsoil |
| ISSN号 | 1526-498X |
| DOI | 10.1002/ps.1779 |
| 通讯作者 | Si, Youbin(ybsi2002@yahoo.com.cn) |
| 英文摘要 | BACKGROUND: Variations in soil properties with depth influence retention and degradation of pesticides. Understanding how soil properties within a profile affect pesticide retention and degradation will result in more accurate prediction by simulation models of pesticide fate and potential groundwater contamination. Metolachlor is more persistent than other acetanilide herbicides in the soil environment and has the potential to leach into groundwater. Reasonably, information is needed about the dissipation and eventual fate of metolachlor in subsoils. The objectives were to evaluate the adsorption and desorption characteristics and to determine the dissipation rates of metolachlor in both surface and subsurface soil samples. RESULTS: Adsorption of metolachlor was greater in the high-organic-matter surface soil than in subsoils. Lower adsorption distribution coefficient (K(ads)) values with increasing depth indicated less adsorption at lower depths and greater leaching potential of metolachlor after passage through the surface horizon. Desorption of metolachlor showed hysteresis, indicated by the higher adsorption slope (1/n(ads)) compared with the desorption slope (1/n(ads)). Soils that adsorbed more metolachlor also desorbed less metolachlor. Metolachlor dissipation rates generally decreased with increasing soil depth. The first-order dissipation rate was highest at the 0-50 cm depth (0.140 week(-1)) and lowest at the 350-425 cm depth (0.005 week(-1)). Degradation of the herbicide was significantly correlated with microbial activity in soils. CONCLUSION: Metolachlor that has escaped degradation or binding to organic matter at the soil surface might leach into the subsurface soil where it will dissipate slowly and be subject to transport to groundwater. (C) 2009 Society of Chemical Industry |
| 收录类别 | SCI |
| WOS关键词 | MICROBIAL BIOMASS ; UNSATURATED ZONE ; FIELD LYSIMETERS ; ORGANIC-MATTER ; ATRAZINE ; DEGRADATION ; SORPTION ; PERSISTENCE ; PESTICIDES ; HERBICIDE |
| WOS研究方向 | Agriculture ; Entomology |
| WOS类目 | Agronomy ; Entomology |
| 语种 | 英语 |
| WOS记录号 | WOS:000269587000004 |
| 出版者 | JOHN WILEY & SONS LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558775 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Si, Youbin |
| 作者单位 | 1.Natl Inst Agroenvironm Sci, Dept Environm Chem, Tsukuba, Ibaraki 3058604, Japan 2.Anhui Agr Univ, Sch Resources & Environm, Hefei 230036, Peoples R China 3.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 4.Kowa Co Ltd, Kowa Res Inst, Tsukuba, Ibaraki 3050856, Japan |
| 推荐引用方式 GB/T 7714 | Si, Youbin,Takagi, Kazuhiro,Iwasaki, Akio,et al. Adsorption, desorption and dissipation of metolachlor in surface and subsurface soils[J]. PEST MANAGEMENT SCIENCE,2009,65(9):956-962. |
| APA | Si, Youbin,Takagi, Kazuhiro,Iwasaki, Akio,&Zhou, Dongmei.(2009).Adsorption, desorption and dissipation of metolachlor in surface and subsurface soils.PEST MANAGEMENT SCIENCE,65(9),956-962. |
| MLA | Si, Youbin,et al."Adsorption, desorption and dissipation of metolachlor in surface and subsurface soils".PEST MANAGEMENT SCIENCE 65.9(2009):956-962. |
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来源：南京土壤研究所
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