Mineralogical insights, pollution patterns and source analysis of heavy metals in post-mining black shale from southern China
文献类型： 外文期刊
作者： Huang, Zulv 1 ; Liu, Min 1 ; Liu, Jinyi 1 ; Mo, Yaye 1 ; Lai, Guifang 1 ; Zeng, Shiyan 1 ; Huang, Yi 1 ; Jiang, Shaojun 2 ;
作者机构： 1.Hunan City Univ, Sch Mat & Chem Engn, Yiyang 413000, Peoples R China
2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China
关键词： Black shale; Quantitative mineralogy analysis; Heavy metal contamination; Spatial distribution; Source apportionment
期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）
ISSN： 2213-2929
年卷期： 2025 年 13 卷 5 期
页码：
收录情况： SCI
摘要： Mineral liberation analysis, sequential extraction, and Positive Matrix Factorization (PMF) assessed weathering, metal release, and environmental risks in polymetallic from a post-mining site from southern China. The shale was dominated by chalcedony (69.4 %), illite (11.2 %), and sulfides (2.1 %). Fine-grained sulfide liberation (<63 mu m) and acid-driven chalcedony dissolution controlled long-term contaminant flux. Geochemical analyses revealed enrichment of V (72 x crustal baseline), Cd (28 x), Zn (11 x), and Ni (7 x). Sulfide oxidation (total S <= 3.5 %) drove acid mine drainage, mobilizing Cd hosted mainly in sphalerite (72.4 %). Chalcedony incorporated significant V (58.7 %) and Zn (18.9 %), with > 70 % in liberated particles susceptible to pH-dependent dissolution. Topsoils exhibited severe polymetallic contamination (mean pH = 5.3), with Cd exceeding China's Grade II standard by 10-fold (mean: 14.5 mg/kg). Sequential extraction confirmed Cd's high mobility (75.6 % acid-soluble), contrasting with V (79.4 %) and Zn (82.3 %) mainly in residual phases. Spatial heterogeneity reflected mineralogical inheritance: Cd migrated via ion transport, while V/Zn distribution correlated with detrital chalcedony and clay neoformation. PMF identified five sources: agricultural (Cu), sulfide weathering (Cd), geogenic (Fe-Mn-Co), traffic (Ni-V-Co), and chalcedony weathering (Zn-V-As). V was identified as a critical health risk driver, with 8.3 % of soils posing elevated non-carcinogenic hazards to children (HQ >1). Pollution indices (I-geo, PI) revealed severe multi-metal contamination, particularly for Cd. These findings underscored the necessity for targeted remediation of Cd and V hotspots and proactive management in black shale mining landscapes.
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