土壤中砷的来源及迁移释放影响因素研究进展

砷是一种高致癌风险的类金属,自然环境中高砷(As)含量可对人类和生态系统构成直接的健康威胁。研究自然环境中砷的来源、存在形式及影响因素有助于进一步理解环境中砷的迁移转化规律,降低人体摄入砷的风险。对文献的分析表明,铁锰氧化物矿物的还原性溶解、黄铁矿及其他硫化物矿物的氧化溶解、铝氢氧化物表面的砷还原、有机质抑制砷吸附以及Eh降低和pH升高是造成砷向环境迁移的主要原因。本文综述了环境中砷的来源及其向环境迁移的多种影响因素,分析了这些因素与砷之间的作用机制,以期为加强砷污染治理提供科学依据。

Sources of Arsenic in Soil and Affecting Factors of Migration and Release: A Review

Arsenic is a kind of metalloid with high carcinogenic risk. The high As content in natural environment poses a direct health threat to humans and ecosystems. Studying the sources, existing forms and influencing factors of arsenic in the natural environment will help to further understand the law of arsenic migration and transformation in the environment and reduce the risk of human exposuring to arsenic.Analysis of the literature showes that the reductive dissolution of iron-manganese oxide minerals, the oxidative dissolution of pyrite and other sulfide minerals, the reduction of arsenic on the surface of aluminum hydroxides, the inhibition of arsenic adsorption by organic matter, the decrease of Eh and the increase of pH are the major contributors to the migration of arsenic to the environment. This research summarized the sources, release and migration of arsenic in the environment and analyzed the mechanism of action between these factors and arsenic, which provided scientific basis for strengthening arsenic pollution treatment.