Chen Huanyuan, Chen Baoliang, Huang Chunlei, Lu Xinzhe, Zou Ruosong, Wei Yutong
College of Environmental & Resource Sciences, Zhejiang University, Hangzhou 310027, China.
Qiantang Institute of Geology, Hangzhou 310027, China.
Toxics. 2025 Aug 14;13(8):679. doi: 10.3390/toxics13080679.
Some soil heavy metal pollution, such as As (Arsenic) and Cd (cadmium), in the black shale areas of western Zhejiang, exhibits significant geological background characteristics, yet the migration patterns and bioavailability are unclear. This study systematically integrated geochemical investigations of the rock-weathered soil-water-soil system to reveal the migration mechanisms and the species of the potentially toxic elements (PTEs) in black shale regions. The results showed that strongly acidic drainage (pH = 3.9) released from black shale weathering led to significant enrichment of Cd and As in soils. The mean Cd concentration (0.84 mg/kg) was 3.3 times higher than the Zhejiang background value, with active speciation (exchangeable fraction and humic acid-bound fraction) dominating during migration. This research provides a scientific basis for PTE prevention and control in geologically high-background regions.
浙江西部黑色页岩地区的一些土壤重金属污染，如砷（As）和镉（Cd），具有显著的地质背景特征，但迁移模式和生物有效性尚不清楚。本研究系统地整合了岩石-风化土壤-水-土壤系统的地球化学调查，以揭示黑色页岩地区潜在有毒元素（PTEs）的迁移机制和种类。结果表明，黑色页岩风化产生的强酸性排水（pH = 3.9）导致土壤中镉和砷显著富集。镉的平均浓度（0.84 mg/kg）比浙江背景值高3.3倍，在迁移过程中以活性形态（可交换态和腐殖酸结合态）为主。本研究为地质高背景地区PTEs的防治提供了科学依据。
