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Lu L, Lei M, Zhou Y, Cui H, Du H. In vitro tungsten bioaccessibility in Chinese residential soils: Implications for human health risk assessments and soil screening level derivation. JOURNAL OF HAZARDOUS MATERIALS 2024; 477:135368. [PMID: 39079296 DOI: 10.1016/j.jhazmat.2024.135368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2024] [Revised: 07/10/2024] [Accepted: 07/27/2024] [Indexed: 08/17/2024]
Abstract
Tungsten (W) contamination presents emerging environmental challenges, necessitating the need to establish soil screening levels (SSLs), especially for residential soils. This study assessed the health exposure risk and derived national and regional residential SSLs for W in Chinese residential soils, incorporating machine-learning prediction of in-vitro soil W bioaccessibility. We analyzed 204 residential soil samples collected across 24 provinces, recording a wide range of W concentrations (0.01-3063.2 mg/kg). Synchrotron-based X-ray fluorescence spectroscopy, chemical extractions, and random forest modeling indicated that the key determinants of soil W bioaccessibility were soil pH, cation exchange capacity, organic matter, and clay contents. Monte Carlo simulations demonstrated that soil W contamination predominantly results in noncarcinogenic health risks to residents via oral exposure, especially in mining-affected regions. A national residential SSL (NRSSL) of 35.5 mg/kg and regional residential SSLs (RRSSLs) of 34.5-49.2 mg/kg were established. Incorporating predicted bioaccessibility increased the NRSSL to 73.8 mg/kg and the RRSSLs to 69.8-112.5 mg/kg. Southern China, which is rich in W ore, exhibited lower RRSSLs, underscoring a need for enhanced safety management. Our framework and findings provide a robust scientific foundation for future soil contamination risk assessment studies, and we present customized SSLs that can guide targeted W risk control strategies.
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Affiliation(s)
- Lei Lu
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Ming Lei
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Yaoyu Zhou
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China
| | - Haojie Cui
- College of Resources, Hunan Agricultural University, 410127 Changsha, China
| | - Huihui Du
- College of Environment & Ecology, Hunan Agricultural University, 410127 Changsha, China.
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Zheng X, Qiu S, Zhou B, Li Q, Chen M. Leaching of heavy metals from tungsten mining tailings: A case study based on static and kinetic leaching tests. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 342:123055. [PMID: 38065334 DOI: 10.1016/j.envpol.2023.123055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 11/03/2023] [Accepted: 11/26/2023] [Indexed: 01/26/2024]
Abstract
Heavy metal (HM) leaching from tungsten mine tailings is a serious environmental risk. In this study, we assess the HM pollution level of tungsten tailings, determine the HM leaching patterns and mechanisms, and estimate the HM fluxes from a tailings reservoir. The results showed that the comprehensive pollution index (CRSi) values that decreased in order of the HM pollution levels in the tailings were cadmium (Cd) > tungsten (W) > lead (Pb) > copper (Cu) = zinc (Zn) > arsenic (As) > manganese (Mn). This result indicated that Cd, W, and Pb were priority pollutants in tailings. The Res fraction of all HMs was greater than 50%. Pb and Cd had similar species fractions with high Exc fractions, and tungsten had a considerable proportion of the Wat fraction. The general acid neutralizing capacity (GANC) test divides the leaching process of HMs into two stages, and each of stage is affected by different mechanisms. A neutral environment promoted tungsten leaching in the column leching test, while an acidic environment promoted Cd and Pb leaching. In addition, the pH effect was more obvious in the early stage. The kinetic fitting results showed that the second-order dynamic model well simulated the leaching of W, Pb, and Cd in most cases. Based on column kinetic leaching test results and tailings parameters, the annual W, Pb, and Cd fluxes were estimated to be 6.35 × 108, 1.3288 × 109, and 1.012 × 108 mg/year, respectively. The above results can guide the environmental management of tungsten tailing reservoirs, such as selecting suitable repair materials and estimating repair service times.
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Affiliation(s)
- Xiaojun Zheng
- Cooperative Innovation Center jointly established by the Ministry and the Ministry of Rare Earth Resources Development and Utilization, Ganzhou, 341000, Jiangxi, China; Key Laboratory of Environmental Pollution and Control in Mining and Metallurgy of Jiangxi Province, Ganzhou, 341000, Jiangxi, China; School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
| | - Shiyue Qiu
- Cooperative Innovation Center jointly established by the Ministry and the Ministry of Rare Earth Resources Development and Utilization, Ganzhou, 341000, Jiangxi, China; Key Laboratory of Environmental Pollution and Control in Mining and Metallurgy of Jiangxi Province, Ganzhou, 341000, Jiangxi, China; School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
| | - Buchan Zhou
- Cooperative Innovation Center jointly established by the Ministry and the Ministry of Rare Earth Resources Development and Utilization, Ganzhou, 341000, Jiangxi, China; Key Laboratory of Environmental Pollution and Control in Mining and Metallurgy of Jiangxi Province, Ganzhou, 341000, Jiangxi, China; School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
| | - Qi Li
- Cooperative Innovation Center jointly established by the Ministry and the Ministry of Rare Earth Resources Development and Utilization, Ganzhou, 341000, Jiangxi, China; Key Laboratory of Environmental Pollution and Control in Mining and Metallurgy of Jiangxi Province, Ganzhou, 341000, Jiangxi, China; School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
| | - Ming Chen
- Cooperative Innovation Center jointly established by the Ministry and the Ministry of Rare Earth Resources Development and Utilization, Ganzhou, 341000, Jiangxi, China; Key Laboratory of Environmental Pollution and Control in Mining and Metallurgy of Jiangxi Province, Ganzhou, 341000, Jiangxi, China; School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China.
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Wu X, Qin J, Zhang G, Wu S, Zeng L, Li J, Li Q, Cao Z, Wang M, Guan W. A feasible strategy for deep arsenic removal and efficient tungsten recovery from hazardous tungsten residue waste with the concept of weathering process strengthening. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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