采用连续提取法对德兴铜矿大坞河流域的土壤样品中Cd元素的形态进行分析,并基于缓变型地球化学灾害模型,对大坞河流域土壤中Cd的环境地球化学特征进行研究。结果显示,大坞河上游的祝家村附近和中游的德铜医院附近的土壤中Cd元素活动性...采用连续提取法对德兴铜矿大坞河流域的土壤样品中Cd元素的形态进行分析,并基于缓变型地球化学灾害模型,对大坞河流域土壤中Cd的环境地球化学特征进行研究。结果显示,大坞河上游的祝家村附近和中游的德铜医院附近的土壤中Cd元素活动性污染总浓度(total concentration of active specie of Cd,以下记为TCASCd)随着污染物的可释放总量(total releseable content of the pollutant of Cd,以下记为TRCPCd)增加而增加,二者之间呈线性关系。虽然大坞河上-中游的样品中TRCPCd范围均在国家三级土壤标准之下,但随着该地区土壤中Cd元素的不断输入,这种情况下所造成的污染相对于缓变型地球化学灾害造成的污染,应当更加引起重视。在大坞河下游的下沽口村附近土壤中,Cd的各形态数据特征符合缓变型地球化学灾害特征,且有TRCPCd向TCASCd释放转化的趋势。Cd元素的缓变型地球化学灾害模型为y=1.12167E-04x3-6.25584E-02x2+1.15298E+01x-6.07452E+02。爆发临界点为TRCPCd=185.90ng/g,有约36%的样品超过爆发临界点,具有爆发缓变型地球化学灾害的可能性。这种认识对大坞河流域土壤中Cd元素污染的预警和对生态环境的改善具有重要意义。展开更多
Fluorine is in the dynamic balance of two geochemical processes, enrichment and leaching, reflecting the adsorption and desorption of fluoride by clay minerals, respectively. The two geochemical processes of fluorine ...Fluorine is in the dynamic balance of two geochemical processes, enrichment and leaching, reflecting the adsorption and desorption of fluoride by clay minerals, respectively. The two geochemical processes of fluorine in soil are influenced by factors including geochemical characteristics of soil and clay minerals, pH and sanity of soil solutions, climate, grazing and agriculture activities. Main factors controlling enrichment and leaching process of fluorine in soil can be found with interaction consideration.展开更多
文摘采用连续提取法对德兴铜矿大坞河流域的土壤样品中Cd元素的形态进行分析,并基于缓变型地球化学灾害模型,对大坞河流域土壤中Cd的环境地球化学特征进行研究。结果显示,大坞河上游的祝家村附近和中游的德铜医院附近的土壤中Cd元素活动性污染总浓度(total concentration of active specie of Cd,以下记为TCASCd)随着污染物的可释放总量(total releseable content of the pollutant of Cd,以下记为TRCPCd)增加而增加,二者之间呈线性关系。虽然大坞河上-中游的样品中TRCPCd范围均在国家三级土壤标准之下,但随着该地区土壤中Cd元素的不断输入,这种情况下所造成的污染相对于缓变型地球化学灾害造成的污染,应当更加引起重视。在大坞河下游的下沽口村附近土壤中,Cd的各形态数据特征符合缓变型地球化学灾害特征,且有TRCPCd向TCASCd释放转化的趋势。Cd元素的缓变型地球化学灾害模型为y=1.12167E-04x3-6.25584E-02x2+1.15298E+01x-6.07452E+02。爆发临界点为TRCPCd=185.90ng/g,有约36%的样品超过爆发临界点,具有爆发缓变型地球化学灾害的可能性。这种认识对大坞河流域土壤中Cd元素污染的预警和对生态环境的改善具有重要意义。
基金supported by the Key Project of International Cooperation of the Ministry of Science and Technology of China(2010DFB30530)Social Development Project of Guizhou Province,China(SZ[2009]3045)Science and Technology Foundation of Guizhou Province,China(J[2008]2312)
文摘Fluorine is in the dynamic balance of two geochemical processes, enrichment and leaching, reflecting the adsorption and desorption of fluoride by clay minerals, respectively. The two geochemical processes of fluorine in soil are influenced by factors including geochemical characteristics of soil and clay minerals, pH and sanity of soil solutions, climate, grazing and agriculture activities. Main factors controlling enrichment and leaching process of fluorine in soil can be found with interaction consideration.