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Assessment of leaching behavior and human bioaccessibility of rare earth elements in typical hospital waste incineration ash in China |
Chunfeng Wang1(), Guanfei Chen1, Yanchen Zhu1, Dan Yao1, Wanfeng Wang1, Lianjun Wang2() |
1. Henan Key Laboratory for Environmental Pollution Control and Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, School of Environment, Henan Normal University, Xinxiang 453007, China 2. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China |
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Abstract • Leaching behavior and human bioaccessibility of REEs in HWI ashes were assessed. • LREE leached amounts were higher than those of HREEs via both leaching tests. • REEs were extracted to the higher level by PBET method compared to leaching test. • Bioaccessibility results depend commonly on pH value and chelating role. • Synergetic effects of contaminants in HWI ashes need further investigation.
![]() Leaching behavior and gastrointestinal bioaccessibility of rare earth elements (REEs) from hospital waste incineration (HWI) fly and bottom ash samples collected from Beijing and Nanjing Cities were assessed. In the same ash sample, the leaching concentrations of individual REEs determined by the Toxicity Characteristic Leaching Procedure (TCLP) were higher than those detected by the European standard protocol (EN-type test), thereby suggesting that the low pH value of leaching solution was an important factor influencing the leachability of REE. The REE bioaccessibility results, which were evaluated using the physiologically based extraction test (PBET), indicated that REEs were highly absorbed during gastric phase by dissolution; and subsequently precipitated and/or re-adsorbed in small intestinal phase. The relative amounts of the total REEs extracted by the TCLP method, EN-type test and PBET test were compared. In addition to the pH value of extraction solutions, the chelating role of REEs with organic ligands used in the PBET method was also an important parameter affecting REE adsorption in human body. Additionally, this study showed that REEs were extracted by these methods as concomitants of heavy metals and anions (NO3−, F−, SO42−, and Cl−) from HWI ash, which probably caused the remarkably complex toxicity on human body by the exposure pathway.
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Keywords
Assessment
Rare earth elements
Leaching behavior
Bioaccessibility
Hospital waste
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Corresponding Author(s):
Chunfeng Wang,Lianjun Wang
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Issue Date: 11 May 2017
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