Multiple approaches for heavy metal contamination characterization and source identification of farmland soils in a metal mine impacted area

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2024-07-30 DOI:10.1016/j.apgeochem.2024.106125

Shubin Zhou , Qiuming Cheng , David C. Weindorf , Biying Yang , Zebin Gong , Zhaoxian Yuan

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Abstract

Heavy metal and metalloid contamination of farmland soils are closely related to human health. Soil contamination caused by small-scale mining activities has been largely neglected, especially in developing countries. This research studies the characteristics and the source of heavy metals and metalloids in farmland soils in the Bailing Cu–Zn deposit area in Northeastern China through multiple approaches. Geochemical mapping conducted by portable X-ray fluorescence (pXRF) spectrometry and elemental fractionation analysis (sequential extraction) revealed the spatial variations in elemental concentration and fractionation of the farmland soils. The elemental variations in the sediment and water samples in a stream passing by the farmland were determined by inductively coupled plasma mass spectroscopy (ICP-MS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) analysis. Results indicate elevated As, Zn, Fe, and Mn concentrations in the west bank of the farmland and the associated environmental risks caused by extremely high As concentrations (>500 mg kg⁻¹). The upstream mining activities are identified as a dominated source of contamination in the studied farmland based on the variations of elemental concentrations and fractionations, as well as multivariate analysis results. This study revealed potential ecological risks caused by heavy metal and metalloid contamination in farmland soils in the metal mine impacted area and the stream as a primary pathway for the migration of pollutants associated with mining activities.

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金属矿影响区农田土壤重金属污染特征描述和来源识别的多种方法

农田土壤的重金属和类金属污染与人类健康密切相关。小型采矿活动造成的土壤污染在很大程度上被忽视，尤其是在发展中国家。本研究通过多种方法研究了中国东北百灵铜锌矿床区农田土壤中重金属和类金属的特征和来源。通过便携式 X 射线荧光光谱仪（pXRF）和元素分馏分析（顺序萃取）绘制地球化学图，揭示了农田土壤元素浓度和分馏的空间变化。通过电感耦合等离子体质谱（ICP-MS）和电感耦合等离子体原子发射光谱（ICP-AES）分析，确定了农田附近溪流中沉积物和水样的元素变化。结果表明，农田西岸的砷、锌、铁和锰浓度升高，极高的砷浓度（>500 mg kg-1）导致了相关的环境风险。根据元素浓度和分馏的变化以及多元分析结果，上游采矿活动被确定为所研究农田的主要污染源。这项研究揭示了金属矿影响区农田土壤中重金属和类金属污染造成的潜在生态风险，而溪流是采矿活动相关污染物迁移的主要途径。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.