大庆贴不贴泡沉积物重金属吸附与释放研究

Study on Adsorption and Release of Heavy Metal in Sediment of Tiebutie Pool in Daqing

研究了大庆市贴不贴泡沉积物样品中重金属(Cd、Ph、Cu和Zn)的含量,以及在环境因子(温度、pH值)改变时,沉积物对重金属的吸附与释放特性。研究结果表明,样品中的重金属含量均高于评价标准。沉积物对重金属的吸附量随pH的升高而增加,当pH>7时,吸附量明显增加。沉积物中重金属释放主要发生在酸性(pH<4)区,且随着pH的升高而迅速降低,其释放顺序大致为Zn>Cu≥Pb>Cd。温度对重金属吸附与释放的影响不大。

The paper has made a research on the heavy metals（Cd, Pb, Cu, Zn） content in the sample of Tiebutie Pool in Daqing and the adsorption and release characteristics of the sediment to the heavy metals when the environmental elements such as temperature and pH change. The results show that the heavy metal content in the sample is higher than the normal standard. The amount of adsorption of the sediment to the heavy metals becomes higher with the increasing of pH. When pH is higher than 7, the amount of adsorption increases significantly. The release of the heavy metals mainly occurs in the acidic area, where pH is lower than 4. When pH turns higher, the amount of release becomes smaller immediately. The order of the release is Zn〉Cu≥Pb〉Cd approximately. The result also indicates that the temperature has no significant impact on the adsorption and release of the heavy metals in sediment.