摘要
对湖北省大冶有色金属公司铜冶炼厂附近３４个不同污染程度的酸性和石灰性土壤中Ｃｄ的形态分配规律，及其影响因素进行研究。结果表明，污染土壤中Ｃｄ中的活性很高，无论是酸性土壤，还是石灰性土壤，均以Ｅｘｃｈ－Ｃｄ含量为最高。不同类型土壤中Ｃｄ形态分配规律分别为，酸性土壤：Ｅｓｃｈ－＞ＳＢＯ－＞ＷＢＯ－＞ＯｘＭｎ－；而在石灰性土壤中，则为：Ｅｘｃｈ－＞Ｃａｒｂ－＞ＷＢＯ－＞ＯｘＭｎ－。但由于碳酸钙对Ｃｄ的直接吸持和有机质对Ｃｄ吸持的增加，使Ｅｘｃｈ－分配系数明显低于酸性土壤。土壤各组分对Ｃｄ的亲和能力不同，其中以氧化锰组分对Ｃｄ的亲和能力最强，其次是碳酸钙和有机质。土壤中Ｃｄ的形态分配受一些土壤基本性状的制约，Ｅｘｃｈ－Ｃｄ的分配系数与土壤ｐＨ，氧化锰和粘粒含量密切相关；ＳＢＯ－Ｃｄ的分配系数则主要受土壤中氧化物含量和存在形态的影响。
The distribution of cadmium fractions and factors affecting it in 34 soil samples near a copper smelter in Hubei Province were studied. The results showed that cadmium mainly existed in exchangeable form in contamicated acid or calcareous soils.The distribution ratio of each Cd fraction in acid soils existed as follows: Exch->SBO->WBO->OxMn-;while that in Calcareous soils was as follows: Exch->Carb->WBO->SBO->OxMn-, however.the exchangealbe cadmium in calcareous soils is much less than that in acid soils owing to the adsorption of cadmium by calcite and the increased capacity to adsorp cadmium by organic matter. The affinity of manganese oxide to Cd was strongest,and followed by that of calcite and organic matter. The distribution ratio of exchangeable cadmium is closely related to the soil pH, content of oxide and clay minerals,while that of strong bound to organic matter has a close relationship with the content and the forms of oxide in soils.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
1994年第3期69-74,共6页
Journal of Nanjing Agricultural University
基金
国家自然科学基金
关键词
土壤
污染
镉
形态
分配
contaminated soils
cadmium
fraction
distribution ratio
