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It has been shown that Hg(II) is totally absorbed by 5Ph8HQ  within the first 30 minutes of contact time with <jats:italic>t<\/jats:italic><jats:sub>1\/2<\/jats:sub>  5 minutes, following Langmuir adsorption model. At pH 4, the affinity of mercury is unchallenged by other metals except, for Cu(II), which have shown higher Kd value. With these latter characteristics, 5Ph8HQ was examined for the preconcentration of trace levels of Hg(II). 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