Abstract
The preconcentration of poly(ethylene glycols) (PEG) with various molecular weights on the hanging mercury drop electrode (HMDE) from a stirred solution was studied for the tensammetric determination of trace concentrations of these polymers. Preconcentration was significant in the case of PEGs having m.w. > 1000. The influence of the preconcentration potential on the cathodic tensammetric peak heights was studied in detail for PEG 1500, PEG 4000, PEG 6000, PEG 9000 and PEG 20 000. The concentration of the PEG affects this dependence. With a preconcentration potential of −1.76 V vs. SCE applied for 10 min, the calibration graphs of these PEGs were linear in the concentration range 0.01–0.10 mg 1 −1.
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