广州城市污泥和土壤重金属含量及其有效性研究

The Concentration and Availability of Heavy Metals in Municipal Sewage Sludge and Soil in Guangzhou

对广州市大坦沙污水处理厂污泥，市区、近郊河涌污泥和农业土壤的重金属全量、有效态含量及养分物质进行分析测定，结果表明：污水厂污泥有机质和Ｎ、Ｐ含量丰富，重金属含量在农用标准范围内；污水厂污泥Ｐｂ，Ｃｒ有效率低，Ｃｄ，Ｚｎ，Ｃｕ，Ｍｎ有效率高；市区、近郊农业土壤样品Ｃｄ含量超过农业土壤标准；

The concentrations and available contents of heavy metals in sludge and agricultural soils in Guangzhou city are studied. The concentrations of organic matter、N、P in sewage sludge of Datansha sewage treatment plant are high and fertile. The concentrations of heavy metals in sewage sludge are under the criteria for agricultural use. The availabilities of Pb and Cr in sludge are low,but that of Cd、Zn、Cu and Mn are high. The mean concentraton of Cd in arable soil samples is higher than the criteria for agriculture.