江西九江-彭泽沿长江南岸一带镉来源分析

Source of Cadmium Anomaly in the Jiujiang-Pengze Area along the South Bank of the Yangtze River

对九江-彭泽沿长江南岸一带不同成土母质Cd的分布特征在垂向、横向剖面上的研究发现,长江干流冲积成因的砂砾泥质土壤、二叠纪燧石结核(含碳)灰岩质土壤、寒武纪泥页岩质土壤、震旦纪砂岩质土壤,与其它成土母质形成的的残坡积土壤Cd含量差异较大。上述四者Cd平均含量均大于0.3×10-6,是本区Cd高值异常主要赋存地质体。同时元素相关性研究表明,Cd与Zn、Cu、As密切相关,自然源是本地区Cd异常普遍存在的根本原因,而人为源却有可能是高值Cd异常沿长江干流大中城市分布的重要影响因素。

Study on the vertical and horizontal profiles of Cd content in different types of soil parent materials shows that the Cd content in four types of soil parent materials evolved from the alluvial sediments along the Yangtze River is obviously higher than in other types. The four types are the gravel-silty soil, the Permian chert-noduled （carbon contained） limy soil, the Cambrian shaly soil and the Sinian sandy soil. Their Cd average content are all higher than 0.3 × 10^-6, and they are the main Cd high-value anomaly hosting geological bodies. The result of element correlation coefficient indicates that Cd, Zn, Cu and As are closely related and the natural source is the cause of the common Cd anomaly in the study area, meanwhile, artificial polluting could probably be a big affection of the Cd high-value anomaly around the large cities along the Yangtze River.