污灌区土壤-植物系统中重金属分布与迁移转化特征研究

为给污灌区重金属污染治理提供一定的科学依据,研究了陕西省咸阳市郊渭河北岸接受污水灌溉的沙质土地中,不同种类的重金属在土壤-植物系统中的分布与迁移转化特征。土样采集用分层采样法,同时采集同一样点的植物样(地面、地下部分)、水样,使用火焰原子吸收分光光度法测定Cd、Cr、Pb、Cu、Zn含量。结果表明:该土壤中重金属Cd、Cr、Pb主要分布在0~50 cm处;不同植物对同种重金属吸收有差异,同种植物对不同重金属的吸收差异也较大;污灌水中重金属Hg、Cd、Pb含量的高低,与相对应的灌区土壤和植物中重金属的累积量的多少基本一致。

Study on the distribution of heavy metals and its transfer and transform in soil-plant system of sewage irrigation area

To provide some scientific data for heavy metals prevention,the distribution of heavy metal and its transfer in soil-plant system of sewage-irrigated area in sandy soil of Shaanxi Province were investigated.Soil samples were collected with layering method.Plant samples(containing ground and underground) and water samples were collected in the same place.Flame atomic spectrophotometer was used to determine contents of lead,cadmium,chromium,copper and zinc.The main distribution area of heavy metals was the depth from zero to fifty centimeter.The same plants were able to absorb different heavy metals while different species have different absorption for same heavy metals.Concentration of heavy metals in soil and its plant were high as well as in sewage.