不同体系中黄河沉积物对Cd^(2+)吸附能力的比较

Comparison Study on Cd^2+ Sorption Capacity of Yellow River Sediments in Different Systems

以黄河包头段的沉积物为吸附剂,分别以Cd^(2+)单离子溶液体系和Pb^(2+)、Cu^(2+)、Zn^(2+)、Cd^(2+) 4种离子的混合溶液体系为吸附质,开展了在不同体系中Cd^(2+)的吸附、形态转化及释放等的比较实验。结果表明,不同体系中,Cd^(2+)的吸附等温线类型、吸附量、pH突跃区域的差别均较大,但不同体系中Cd^(2+)被沉积物吸附后的形态转化趋势基本相同;多离子体系中Cd^(2+)被吸附后的释放百分率比对应时间的单离子体系大,且释放曲线的峰型亦不同。

Sediments were taken from the Baotou reach of Yellow River as adsorbent, and single and mixed so -lution systems made up of Cd2+, Pb2+, Cu2+ and Zn2+ as adsorbate, and comparative experiment on adsorption, transformation and release of Cd2+ on Yellow River sediments in different systems have been conducted. The result showed that the adsorption isotherm, adsorption capacity and pH- dependent area were different greatly, but transformation of Cd2+ has only a little change. In addition, release percentage of Cd2+ adsorbed on polyion coexisting system was far greater than the single system, and the release curves were different in two systems.