Abstract
Abstract Equilibrium dialysis, for the study of trace metal speciation in natural waters has been investigated. The times taken for dissolved metals (at μgL‐1 concentrations) to attain dialysis equilibrium varied from about 10 hours in seawater to over one hundred hours in low hardness freshwater solutions. Equilibration times were strongly influenced by adsorption effects and were not controlled by diffusion alone. In estuarine water samples from South Wales, UK, non‐dialysable forms of cadmium, nickel and zinc were relatively unimportant, whereas up to 62% of filterable copper was non‐dialysable.
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