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Title (Primary) Uptake and metabolization of HCH isomers in trees examined over an annual growth period by compound-specific isotope analysis and enantiomer fractionation
Author Liu, X.; Yang, A.; Kümmel, S.; Richnow, H.H.
Journal Environmental Science & Technology
Year 2022
Department ISOBIO
Volume 56
Issue 14
Page From 10120
Page To 10130
Language englisch
Topic T7 Bioeconomy
Supplements https://pubs.acs.org/doi/10.1021/acs.est.2c02697?goto=supporting-info
Keywords isotope fractionation; transformation; dual-element isotope analysis; phytoremediation; contaminated field
Abstract To understand the role of plants for natural attenuation, a field study was conducted to characterize the fate of HCH in trees over an annual growth period using compound-specific isotope analysis and enantiomer fractionation. Stable and slightly higher δ13C and δ37Cl values of HCH of host soil samples compared to the muck (consisting nearly exclusively of HCH) revealed that masking isotope effects caused by the limited bioavailability may underestimate the real extent of HCH transformation in soil. In contrast, an increase of δ13C and δ37Cl values in trees indicated the transformation of HCH. A large variability of δ13C and δ37Cl values in trees over the growth period was observed, representing different transformation extents among different growth times, which is further supported by the shift of the enantiomer fraction (EF), indicating the preferential transformation of enantiomers also varied over the different growth periods. Based on dual-element isotope analysis, different predominant transformation mechanisms were observed during the growing seasons. Our observation implies that plants are acting as biological pumps driving a cycle of uptake and metabolization of HCH and refeed during littering to soil catalyzing their transformation. The changes of the transformation mechanism in different seasons have implications for phytoscreening and shed new light on phytoremediation of HCH at field sites.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26283
Liu, X., Yang, A., Kümmel, S., Richnow, H.H. (2022):
Uptake and metabolization of HCH isomers in trees examined over an annual growth period by compound-specific isotope analysis and enantiomer fractionation
Environ. Sci. Technol. 56 (14), 10120 - 10130