Asian Science
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Abstract: Pseudomonas striata cell mass was immobilized
in polyvinylchloride (PVC), a neutral carrier to prepare zinc selective
membranes using Dibutyl-phthalate as the plasticizer. Membranes were prepared
using 1, 2, 3, 5 and 7% of bacterial biomass, of which the highest response
was obtained for 5%. Potentiometric response of the electrode was studied
for Zn, Cd and Cu in the concentration range of 10-7 to 10-1
M. A linear trend between the electrode response and the varying metal
concentrations was seen only for Zn2+ ions in the range of
10-4 to 10-1 M. Calibration slope of 22 mV/decade
and detection limit of 510-4 M was obtained for zinc. Electrode
showed a sharp response time of 6 sec and pH optima of 3. Thus, the PVC
membrane containing the bacterial biomass was found to selectively bind
the Zn2+ ions and generate the corresponding potential response
at different zinc concentrations.