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.