期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 17, 页码 11848-11858出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c02028
关键词
selenium; selenite; selenate; X-ray fluorescence microscopy; XANES; bioaccumulation; biodistribution; multielement analysis; amphibian
资金
- Australian Research Council Discovery Early Career Award - Australian Government [DE180101286]
- Australian Research Council [DE180101286] Funding Source: Australian Research Council
Synchrotron-based XFM and XANES imaging were used to study Se biodistribution and speciation in Limnodynastes peronii tadpoles. Results showed that Se primarily accumulated in the eyes, digestive, and excretory organs, with the majority converted to organo-Se.
Synchrotron-based X-ray fluorescence microscopy (XFM) coupled with X-ray absorption near-edge structure (XANES) imaging was used to study selenium (Se) biodistribution and speciation in Limnodynastes peronii tadpoles. Tadpoles were exposed to dissolved Se (30 mu g/L) as selenite (Se-IV) or selenate (Se-VI) for 7 days followed by 3 days of depuration. High-resolution elemental maps revealed that Se partitioned primarily in the eyes (specifically the eye lens, iris, and retinal pigmented epithelium), digestive and excretory organs of Se-IV-exposed tadpoles. Speciation analysis confirmed that the majority of accumulated Se was converted to organo-Se. Multielement analyses provided new information on Se colocalization and its impact on trace element homeostasis. New insights into the fate of Se on a whole organism scale contribute to our understanding of the mechanisms and risks associated with Se pollution.
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