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Geochemical fractionation and potential release behaviour of heavy metals in lead–zinc smelting soils

Journal of Environmental Sciences 2024年第5期139卷 1-11页

作者： Xinghua Luo Chao Xiang Chuan Wu Wenyan Gao Wenshun Ke Jiaqing Zeng waichin li Shengguo Xue School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China Department of Science and Environmental Studies The Education University of Hong KongHong Kong 999077China

The lack of understanding of heavy metal speciation and solubility control mechanisms in smelting soils limits the effective pollution *** this study smelting soils were investigated by an advanced mineralogical analysis(AMICS),leaching tests and thermodynamic *** aims were to identify the partitioning and release behaviour of Pb,Zn,Cd and *** integration of multiple techniques was necessary and displayed coherent *** addition to the residual fraction,Pb and Zn were predominantly associated with reducible fractions,and As primarily existed as the crystalline iron oxide-bound *** quantitative analysis further confirmed that Fe oxyhydroxides were the common dominant phase for As,Cd,Pb and *** addition,a metal arsenate(paulmooreite)was an important mineral host for Pb and *** pH-stat leaching indicted that the release of Pb,Zn and Cd increased towards low pH values while release of As increased towards high p H *** separate leaching schemes were associated with the geochemical behaviour under the control of minerals and were confirmed by thermodynamic *** calculations suggested that the formation of arsenate minerals(schultenite,mimetite and koritnigite)and the binding to Fe oxyhydroxides synchronously controlled the release of Pb,Zn,Cd and *** results emphasized the governing role of Fe oxyhydroxides and secondary insoluble minerals in natural attenuation of heavy metals,which provides a novelty strategy for the stabilization of multi-metals in smelting sites.

关键词： Smelting soils Heavy metal Fractionation AMICS Geochemical modelling

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Illumina-Based Analysis of Bulk and Rhizosphere Soil Bacterial Communities in Paddy Fields Under Mixed Heavy Metal Contamination

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Pedosphere 2017年第3期27卷 569-578页

作者： HE Huaidong li waichin Riqing YU YE Zhihong State Key Laboratory of Biocontrol and Guangdong Key Laboratory of Plant Resources School of Life Sciences Sun Yat-sen University Department of Science and Environmental Studies The Education University of Hong Kong Department of Biology The University of Texas at Tyler

There is an increasing concern about rice （Oryza sativa L.） soil microbiomes under the influence of mixed heavy metal contamina- tion. We used the high-throughput Illumina MiSeq sequencing approach to explore the bacterial diversity and community composition of soils in four paddy fields, exhibiting four degrees of mixed heavy metal （Cd, Pb and Zn） pollution, and examined the effects of these metals on the bacterial communities. Our results showed that up to 2 104 to 4 359 bacterial operational taxonomic units （OTUs） were found in the bulk and rhizosphere soils of the paddy fields, with the dominant bacterial phyla （greater than 1% of the overall community） including Proteobacteria, Actinobacteria, Firmicutes, Acidobacteria, Gemmatimonadetes, Chlorofiexi, Bacteroidetes and Nitrospirem. A number of rare and candidate bacterial groups were also detected, and Saprospirales, HOC36, SC-I-84 and Anaerospora were rarely detected in rice paddy soils. Venn diagram analysis showed that 174 bacterial OTUs were shared among the bulk soils with four pollution degrees. Rice rhizosphere soils displayed higher bacterial diversity indices （ACE and Chao 1） and more unique OTUs than bulk soils. Total Cd and Zn in the soils were significantly negatively correlated with ACE and Chao 1, respectively, and the Mantel test suggested that total Pb, total Zn, pH, total nitrogen and total phosphorus significantly affected the community structure. Overall, these results provided baseline data for the bacterial communities in bulk and rhizosphere soils of paddy fields contaminated with mixed heavy metals.

关键词： bacterial diversity community structure Illuming MiSeq sequencing approach long-term contamination paddy soil

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The effect of extracellular polymeric substances (EPS) of iron-oxidizing bacteria (Ochrobactrum EEELCW01) on mineral transformation and arsenic (As) fate

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Journal of Environmental Sciences 2023年第8期130卷 187-196页

作者： Chuan Wu Yueru Chen Ziyan Qian Hongren Chen waichin li Qihou li Shengguo Xue School of Metallurgy and Environment Central South UniversityChangsha 410083China Department of Science and Environmental Studies The Education University of Hong KongHong Kong 999077China Ministry of Scientific Research Central South UniversityChangsha 410083China

Extracellular polymeric substances(EPS)are an importantmedium for communication and material exchange between iron-oxidizing bacteria and the external environment and could induce the iron(oxyhydr)oxides production which reduced arsenic(As)*** main component of EPS secreted by iron-oxidizing bacteria(Ochrobactrum EEELCW01)was composed of polysaccharides(150.76-165.33 mg/g DW)followed by considerably smaller amounts of proteins(12.98–16.12 mg/g DW).Low concentrations of As(100 or 500μmol/L)promoted the amount of EPS *** results showed that EPS was composed of polysaccharides,proteins,and a miniscule amount of nucleic *** functional groups including-COOH,-OH,-NH,-C=O,and-C-O played an important role in the adsorption of *** results showed that As was bound to EPS in the form of As3+.With increasing As concentration,the proportion of As3+adsorbed on EPS *** with a weak crystalline state was only produced in the system at 6 hr during the mineralization process of Ochrobactrum *** day 8,the minerals were composed of goethite,galena,and *** the increasing mineralization time,the main mineral phases were transformed from weakly crystalline hydrous iron ore into higher crystallinity siderite(FeCO_(3))or goethite(α-FeOOH),and the specific surface area and active sites of minerals were *** can be seen from the distribution of As elements that As is preferentially adsorbed on the edges of iron *** study is potential to understand the biomineralizationmechanism of iron-oxidizing bacteria and As remediation in the environment.

关键词： Iron-oxidizing bacteria Extracellular polymeric substances (EPS) Arsenic(As) Biomineralization Mineral phases transformation

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Soil heavy metal pollution from Pb/Zn smelting regions in China and the remediation potential of biomineralization

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Journal of Environmental Sciences 2023年第3期125卷 662-677页

作者： Xinghua Luo Chuan Wu Yongcheng lin waichin li Min Deng Jingqiang Tan Shengguo Xue School of Metallurgy and Environment Central South UniversityChangsha 410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Department of Science and Environmental Studies The Education University of Hong KongTai PoHong Kong 999077China School of Geosciences and Info-physics Central South UniversityChangsha 410083China

Smelting activities pose serious environmental problems due to the local and regional heavy metal pollution in soils they cause. It is therefore important to understand the pollution situation and its source in the contaminated soils. In this paper, data on heavy metal pollution in soils resulting from Pb/Zn smelting(published in the last 10 years) in China was summarized. The heavy metal pollution was analyzed from a macroscopic point of view. The results indicated that Pb, Zn, As and Cd were common contaminants that were present in soils with extremely high concentrations. Because of the extreme carcinogenicity, genotoxicity and neurotoxicity that heavy metals pose, remediation of the soils contaminated by smelting is urgently required. The primary anthropogenic activities contributing to soil pollution in smelting areas and the progressive development of accurate source identification were performed. Due to the advantages of biominerals, the potential of biomineralization for heavy metal contaminated soils was introduced. Furthermore, the prospects of geochemical fraction analysis, combined source identification methods as well as several optimization methods for biomineralization are presented, to provide a reference for pollution investigation and remediation in smelting contaminated soils in the future.

关键词： Heavy metals Smelting contaminated soils Source identification Remediation

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