Journal Article

FZJ-2015-06028

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effect of organic carbon chemistry on sorption of atrazine and metsulfuron-methyl as determined by $^{13}$C-NMR and IR spectroscopy

Dutta, A. ; Mandal, A. ; Manna, S. ; Singh, S. B. ; Berns, A. E.FZJ* ; Singh, N. (Corresponding author)

2015
Springer Science + Business Media B.V Dordrecht [u.a.]

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Please use a persistent id in citations: doi:10.1007/s10661-015-4837-3

Abstract: Soil organic matter (SOM) content is themajor soil component affecting pesticide sorption. However,recent studies have highlighted the fact that it is notthe total carbon content of the organic matter, but itschemical structure which have a profound effect on thepesticide’s sorption. In the present study, sorption ofatrazine and metsulfuron-methyl herbicides was studiedin four SOM fractions viz. commercial humic acid,commercial lignin, as well as humic acid and huminextracted from a compost. Sorption data was fitted to theFreundlich adsorption equation. In general, theFreundlich slope (1/n) values for both the herbicideswere <1. Except for atrazine sorption on commercialhumic acid, metsulfuron-methyl was more sorbed. Desorptionresults suggested that atrazine was moredesorbed than metsulfuron-methyl. Lignin, whichshowed least sorption of both the herbicides, showedminimum desorption. Sorption of atrazine was bestpositively correlated with the alkyl carbon (adjustedR2 = 0.748) and carbonyl carbon (adjusted R2 = 0.498)but, their effect was statistically nonsignificant(P = 0.05). Metsulfuron-methyl sorption showed bestpositive correlation with carbonyl carbon (adjustedR2 = 0.960; P = 0.05) content. Sorption of both theherbicides showed negative correlation with O/N-alkylcarbon. Correlation of herbicide’s sorption with alkyland carbonyl carbon content of SOM fractions suggestedtheir contribution towards herbicide sorption.But, sorption of metsulfuron-methyl, relatively morepolar than atrazine, was mainly governed by the polargroups in SOM. IR spectra showed that H-bonds andcharge-transfer bonds between SOM fraction and herbicidesprobably operated as mechanisms of adsorption.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)

Appears in the scientific report 2015

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Database coverage:
; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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