Investigation of Pb species in soils, celery and duckweed by synchrotron radiation X ray absorption near edge structure spectrometry
Abstract The Pb species play a key role in its translocation in biogeochemical cycles. Soils, sediments and plants were collected from farmlands around Pb mines, and the Pb species in them was identified by X ray absorption near edge structure spectrometry. In soils, Pb 5 (PO 4 3 Cl and Pb 3 (PO 4 2 were detected, and in sediments, Pb fulvic acids (FAs) complex was identified. A Pb complex with FA fragments was also detected in celery samples. We found that (1) different Pb species were present in soils and sediments; (2) the Pb species in celery, which was grown in sediments, was different from the species present in duckweed, which grew in water; and (3) a Pb FA like compound was present in celery roots. The newly identified Pb species, the Pb FA like compound, may play a key role in Pb tolerance and translocation within plants.