Isotope fractionation approach to characterize the reactive transport processes governing the fate of hexachlorocyclohexanes at a contaminated site in India

Environment International
Langping WuHans H Richnow

Abstract

The transformation processes of hexachlorocyclohexane isomers (HCHs) from production sites of Lindane across the landscape and along the food web were studied as an example to understand the fate of POPs in the environment. Therefore, we studied the concentration and isotope composition of HCHs in different matrices in the vicinity of a dumpsite and a chemical plant producing HCHs in India. Carbon isotope compositions (δ13C) of HCHs and the enantiomer fraction (EF) of α-HCH were used as indicators to characterize in situ degradation in soil, groundwater, and sediment as well as along the food web. The HCHs were detected in plants growing on contaminated soil. Elevated concentrations of HCHs were found in a number of crops, which indicates an important transfer pathway of HCHs entering food webs. The EF value of α-HCH and the δ13C signature of HCHs indicated that degradation processes occurred in the rhizosphere or within the plants potentially attenuating the contamination of HCHs. The isotope enrichment of HCHs in dung and milk samples showed that degradation of HCHs may take place in the digestive track of cow and buffalo as well as during their metabolism. The δ13C of HCHs was used to analyze the potential dispersion routes ...Continue Reading

Citations

Feb 18, 2020·Rapid Communications in Mass Spectrometry : RCM·Xifen ZhuPing'an Peng
Nov 30, 2019·International Journal of Molecular Sciences·Suraj KannathAgnieszka Dybala-Defratyka
Jul 24, 2021·Indian Journal of Microbiology·Priyanka BokadeAbhay Bajaj
Aug 8, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Eun-Ji WonKyung-Hoon Shin

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