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Selective Extraction of Trace Mercury and Cadmium from Drinking Water Sources
Author(s) -
Zhao Xuan,
Zhao Gang,
Wang Jianlong,
Yun Guichun
Publication year - 2005
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143005x41780
Subject(s) - cadmium , mercury (programming language) , environmental chemistry , environmental science , trace (psycholinguistics) , heavy metals , water pollution , extraction (chemistry) , chemistry , environmental engineering , waste management , chromatography , engineering , organic chemistry , computer science , programming language , linguistics , philosophy
In this paper, a new alternative method, i.e., selective extraction by weakly basic anion exchange resin, has been developed for the removal of trace cadmium and mercury ions from drinking water sources. The mechanism of heavy metal removal is based on selective extraction as the results of LEWIS‐base–acid interactions. Transfer of trace mercury species from liquid to resin phase coincides well with the performance of film diffusion. The results demonstrated that the presence of chlorine has a negligible influence on the removal of mercury. However, humic acids can strongly bind mercury by the formation of complex compounds and therefore become the obstacle in the diffusion progress. At neutral or base pH, the resin material exhibits the favorable uptake of heavy metals. In filter experiments, the studied resin material offers favorable properties in the selective extraction of trace mercury and cadmium.