DOI: 10.1016/j.watres.2018.03.061
Scopus记录号: 2-s2.0-85045027466
论文题名: Pesticide degradation and export losses at the catchment scale: Insights from compound-specific isotope analysis (CSIA)
作者: Alvarez-Zaldívar P. ; Payraudeau S. ; Meite F. ; Masbou J. ; Imfeld G.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 139 起始页码: 198
结束页码: 207
语种: 英语
英文关键词: Attenuation
; CSIA
; Herbicides
; Mass balance
; Monitoring
Scopus关键词: Catchments
; Degradation
; Herbicides
; Impurities
; Monitoring
; Natural attenuation
; Runoff
; Water management
; Weed control
; Attenuation
; Compound specific isotope analysis
; Contaminant degradation
; CSIA
; Environmental concentration
; Mass balance
; Subsurface environment
; Waterresource management
; Isotopes
; carbon 13
; metolachlor
; nitrogen 15
; water
; acetamide derivative
; carbon
; herbicide
; metolachlor
; nitrogen
; carbon isotope
; catchment
; concentration (composition)
; degradation
; environmental monitoring
; herbicide
; isotopic analysis
; mass balance
; pesticide
; stable isotope
; Article
; catchment
; compound specific isotope analysis
; dilution
; environmental monitoring
; fractionation
; hydrology
; isotope analysis
; land use
; priority journal
; soil
; soil degradation
; validation study
; volatilization
; chemistry
; pollutant
; water supply
; Acetamides
; Carbon Isotopes
; Environmental Pollutants
; Herbicides
; Nitrogen Isotopes
; Water Supply
英文摘要: Although pesticides undergo degradation tests prior to use, determining their export, degradation and persistence under field conditions remains a challenge for water resource management. Compound specific isotope analysis (CSIA) can provide evidence of contaminant degradation extent, as it is generally independent of non-destructive dissipation (e.g., dilution, sorption, volatilization) regulating environmental concentrations. While this approach has been successfully implemented in subsurface environments, its application to pesticides in near-surface hydrological contexts at catchment scale is lacking. This study demonstrates the applicability of CSIA to track pesticide degradation and export at catchment scale and identify pesticide source areas contributing to changes in stable isotope signature in stream discharge under dynamic hydrological contexts. Based on maximum shifts in carbon stable isotope signatures (Δδ13C = 4.6 ± 0.5‰) of S-metolachlor (S-met), a widely used herbicide, we estimate maximum degradation to have reached 96 ± 3% two months after first application. Maximum shifts in nitrogen isotope signatures were small and inverse (Δδ15N=−1.3±0.6‰) indicating potential secondary isotope effects during degradation. In combination with a mass balance approach including S-met main degradation products, total catchment non-destructive dissipation was estimated to have reached 8 ± 7% of the applied product. Our results show that CSIA can be applied to evaluate natural attenuation of pesticides at catchment scale. By providing a more detailed account of pesticide dissipation and persistence under field conditions we anticipate the contribution of pesticide CSIA to the improvement of regulatory and monitoring strategies. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112733
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory of Hydrology and Geochemistry of Strasbourg (LHyGeS), Strasbourg University/ENGEES, CNRS, 1 rue Blessig, Strasbourg, 67000, France
Recommended Citation:
Alvarez-Zaldívar P.,Payraudeau S.,Meite F.,et al. Pesticide degradation and export losses at the catchment scale: Insights from compound-specific isotope analysis (CSIA)[J]. Water Research,2018-01-01,139