+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Degradation of chloroacetanilide herbicides and bacterial community composition in lab-scale wetlands

Degradation of chloroacetanilide herbicides and bacterial community composition in lab-scale wetlands

Science of the Total Environment 520: 222-231

Degradation of chloroacetanilide herbicides rac-metolachlor, acetochlor, and alachlor, as well as associated bacterial populations, were evaluated in vertical upflow wetland columns using a combination of hydrochemical and herbicide analyses, and DNA-based approaches. Mass dissipation of chloroacetanilides, continuously supplied at 1.8-1.9 μM for 112 days, mainly occurred in the rhizosphere zone under nitrate and sulphate-reducing conditions, and averaged 61±14%, 52±12% and 29±19% for acetochlor, alachlor and rac-metolachlor, respectively. Metolachlor enantiomer fractions of 0.494±0.009 in the oxic zone and 0.480±0.005 in the rhizosphere zone indicated preferential biodegradation of the S-enantiomer. Chloroacetanilide ethane sulfonic acid and oxanilic acid degradates were detected at low concentrations only (0.5 nM), suggesting extensive degradation and the operation of yet unknown pathways for chloroacetanilide degradation. Hydrochemical parameters and oxygen concentration were major drivers of bacterial composition, whereas exposure to chloroacetanilides had no detectable impact. Taken together, the results underline the importance of anaerobic degradation of chloroacetanilides in wetlands, and highlight the potential of complementary chemical and biological approaches to characterise processes involved in the environmental dissipation of chloroacetanilides.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 057569124

Download citation: RISBibTeXText

PMID: 25817759

DOI: 10.1016/j.scitotenv.2015.03.061

Related references

Using compound-specific isotope analysis to assess the degradation of chloroacetanilide herbicides in lab-scale wetlands. Chemosphere 99: 89-95, 2014

Dynamics of chloroacetanilide herbicides in various types of mesocosm wetlands. Science of the Total Environment 577: 386-394, 2017

Anaerobic degradation of chloroacetanilide herbicides. Applied Microbiology & Biotechnology 42(2-3): 440-445, 1994

Abiotic degradation of chloroacetanilide herbicides by bisulfide. Abstracts of Papers American Chemical Society 217(1-2): ENVR 165, 1999

Degradation of chloroacetanilide herbicides by anodic fenton treatment. Journal of Agricultural and Food Chemistry 54(7): 2640-2651, 2006

The fate of chloroacetanilide herbicides and their degradation products in the Nzoia Basin, Kenya. Ambio 32(6): 424-427, 2003

Determination of chloroacetanilide and chloroacetamide herbicides and their polar degradation products in water by LC/MS/MS. Abstracts of Papers American Chemical Society 223(1-2): ENVR 8, 2002

Activated carbon adsorption of chloroacetanilide herbicides and their degradation products from surface water supplies. Journal of Water Supply Research & Technology - AQUA 52(6): 443-454, 2003

Developmental disorders in embryos of the frog Xenopus laevis induced by chloroacetanilide herbicides and their degradation products. Environmental Toxicology and Chemistry 21(2): 375-379, 2002

Degradation of chloroacetanilide herbicides: the prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters. Environmental Science and Technology 32(11): 1738-1740, 1998

Formamidine insecticides and chloroacetanilide herbicides disubstituted anilines and nitrosobenzenes as mammalian metabolites and bacterial mutagens. Journal of Agricultural & Food Chemistry 34(2): 157-161, 1986

Characterisation of the soil bacterial community structure and composition of natural and constructed wetlands. Science of the Total Environment 473-474: 63-71, 2014

Adsorption of chloroacetanilide herbicides on soil (I). Structural influence of chloroacetanilide herbicide for their adsorption on soils and its components. Journal of Environmental Sciences 13(1): 37-45, 2001