Assessing human bioaccessibility of trace contaminants in size-fractionated red mud, derived precipitates and geopolymeric blocks

doi:10.1007/s11783-017-0956-0

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (6) : 12 https://doi.org/10.1007/s11783-017-0956-0

RESEARCH ARTICLE

Assessing human bioaccessibility of trace contaminants in size-fractionated red mud, derived precipitates and geopolymeric blocks

Chunfeng Wang¹(

), Yanchen Zhu¹, Dan Yao¹, Guanfei Chen¹, 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

PBET values of size-fractionated red mud were depended on pH and chelating role.

MGS results extracted was significantly higher than those by ALF for RM38 samples.

High bioaccessibility values were obtained for derived precipitates using PBET.

High PBET values of the geopolymeric blocks should raise social concerns.

The objective of this study was to provide insight into human exposure to trace contaminants bearing red mud, derived precipitates and geopolymeric blocks due to inhalation contact and/or hand-to-mouth ingestion. The in vitro bioaccessibility behavior of trace contaminants was investigated with the PBET (physiologically based extraction test), ALF (artificial lysosomal fluid) and MGS (modified Gamble’ solution) methods. The results showed that total contents of trace contaminants and operation parameters, such as pH and chelating properties of simulated gastrointestinal phases (PBET), played a joint role in controlling the bioaccessibility efficacy for size-fractionated red mud particles. As for airborne particles (<38 µm size fractions), trace contaminants concentrations extracted by MGS was significantly higher than those by ALF. Additionally, higher bioaccessibility (PBET) values of Cu, Pb, Zn, As, V and U were obtained from red mud derived precipitates compared with those of red mud itself. Even though short-term and long-term leaching values of trace contaminants were relatively lower in the prepared geopolymeric blocks, the health risk could be significantly higher due to the more pronounced bioaccessibility characteristics.

Keywords Bioaccessibility Trace contaminants Red mud Precipitates Geopolymeric blocks.

Corresponding Author(s): Chunfeng Wang,Lianjun Wang

Issue Date: 07 June 2017

Cite this article:

Chunfeng Wang,Yanchen Zhu,Dan Yao, et al. Assessing human bioaccessibility of trace contaminants in size-fractionated red mud, derived precipitates and geopolymeric blocks[J]. Front. Environ. Sci. Eng., 2017, 11(6): 12.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0956-0
https://academic.hep.com.cn/fese/EN/Y2017/V11/I6/12

Fig.1 The weight percentage of each size fractionated red mud

Fig.2 SEM image of RM38 sample

Tab.1 Total concentrations of selected trace contaminants in raw red mud, RM250, RM250-38 and RM-38 samples (mg·kg⁻¹)

Tab.2 The PBET (gastric pH 1.3; intestinal pH 7) results of trace contaminants in sized-fractionated red mud samples (mg·kg⁻¹)

Fig.3 Trace contaminants concentrations extracted by the ALF and MGS bioaccessibility tests in RM38 sample

Tab.3 Total content and PBET bioaccessibility values (gastric pH 1.3; intestinal pH 7) of trace contaminants in both formed precipitates (mg·kg⁻¹)

Fig.4 The photograph of geopolymeric blocks

Tab.4 Total content, PBET bioaccessibility (gastric pH 1.3; intestinal pH 7) and short-term leaching values of trace contaminants in geopolymeric blocks (mg·kg⁻¹)

Fig.5 Long-term leaching values of trace contaminants in geopolymeric blocks (concentrations of both radioactive elements were below the detection limit). The first leaching is conducted with the 0.5 mol·L⁻¹ CH₃COOH solution (pH 5) and then nine successive leaching processes are performed by a simulated acid rainwater (pH 3.0±0.2)

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