环境中砷及其化合物的毒性和危害常与汞、镉并列。作为杀虫剂、除草剂加入土壤中的砷以及肿盐在土壤中的存在状况已有不少报道。从元素背景值考虑,土壤中存在的砷,主要来源于成土母质。虽然在成土过程中土壤剖面内砷的浓度会发生一些变化,但成土母质对土壤中化学元素最初含量的影响仍是主要的。本文以广东境内土壤为例,就华南热带、亚热带 Toxicity and hazards of arsenic and its compounds in the environment are often associated with mercury and cadmium. As pesticides, herbicides added to the soil of arsenic and the presence of swollen salts in the soil has been reported. Considered from the elemental background value, the arsenic present in the soil mainly comes from the parent material. Although the concentration of arsenic in the soil profile changes somewhat during the process of soil formation, the influence of soil parent material on the initial content of chemical elements in the soil is still significant. In this paper, the soil in Guangdong as an example, the South China tropical and subtropical