%0 Journal Article
%T A STUDY ON HEAVY METAL SPECIATION IN POLLUTED-RIVER WATER USING A CHEMICAL EQUILIBRIUM MODEL<br>污染水体重金属形态分布的化学平衡模式
%A Xue Hanbin
%A Bai Naibin
%A Tang Hongxiao
%A <br>薛含斌
%A 白迺彬
%A 汤鸿霄
%J 环境科学学报
%D 1988
%I 
%X Speciation of cadmium, lead and copper in polluted river water from-Xiawan section of Xiangjiang River was investigated using a modified REDEQL2 chemical equilibrium program. 12 metals and 12 ligands that form 134 complexes, 42 precipitates, 2 mixed solid precipitates, 5 oxidation-reduction reactions and adsorption of the metals on suspended solids -were considered according to water quality data collected during a period of 1982 to 1985. The precipitation diagrams were simulated and the comple-xation capacities, conditional stability constants and adsorption constants were measured so as to derive the model input parameters. The calculated results, which were quite consistent with measured data, indicated that at pH 7.5-8. 0 the dominant species are precipitates and adsorbed forms and the dissolved species, including free ions and inorganic complexes, account, for less than 10% of metals in the system. As pH decreases, the fractions, of dissolved metals increase sharply.
%K speciation
%K heavy metal
%K water model
%K chemical equilibrium<br>形态分布
%K 水模式
%K 重金属
%K 化学平衡
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=03A55E61A8750ACAC6AF81EF9E2AC838&aid=B5996CB47DC35476B22463927A0A8B1C&yid=0702FE8EC3581E51&vid=5D311CA918CA9A03&iid=E158A972A605785F&sid=23F20F9780C3579E&eid=EE23223CE4332BD7&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=5&reference_num=0