Selenite-selective membrane electrodes based on ion exchangers and application to anodic slime

A new membrane selenite selective electrode has been developed. The electro de consisted of 4% ion exchanger, QAD 86 PI (dialkyldimethylammonium chlori de), as the active material, and 96% SR as the membrane matrix. An analytic ally useful potential change occurs from 10(-6) - 10(-1) M selenite ion. Th e slope of the linear portion is 19 mV/10 fold change in selenite concentra tion. No interference was observed for SO42-, SO32-, S-2, HPO42-, Cl-, Br- and I- ions. The lifetime of the electrode was about three months. This ele ctrode has been used for the determination of selenium in anodic slime at p H 8 (ammonia buffer) using standard addition method.