Polyester type foams loaded with PAN or 1‐(2‐pyridylazo‐2)‐naphthol, has been used to extract Copper, Zinc and Mercury from large volumes of water. These foams were squeezed in the water by a specially constructed battery operated device. The amounts of Copper and Zinc extracted were found to have a linear relationship with the number of squeezes of the foam.
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Srikameswaran et al. (1978) studied this question.
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