Gallium selective PVC membrane electrodes based on crown ethers

الملخص EN

Gallium selective electrodes based on 12-erown-4 (12C4) and benzo-15-crown-5 (B15 C5) f and plasticizers dioctyl phenyl phosphonate (DOPP), dibutyl phosphate (DBP), dibutyl phthalatc (DBPH) in PVC matrix amembranes constructed.

Specific properties of the electrodes arc studied including calibration curve, slope, detection limit, concentration range, response time and life time as well as the effect of pH on electrode response.

Interference for Li+1, Mg2+, Zn+2, AI+3, Cr+3 on electrode response, have been also investigaled.

The polymeric liquid membrane electrode based on 12C4 using DBPJI plasticizer exhibits the best over all performances as a gallium selective electrode over a wide concentration range (1.0 × 10-5-3.3 × 10-2 M) with Nemestian slope (20mV / deeade).

It has a relatively fast response time excellent detection limit (7 × 10-6 M) and good durability (about 2 months).

The elecLrode revealed a good selectivity for Ga3+ over a variety of other metal ions and could be used in a pH range of 3.0-5.0.

It was used as an indicator electrode in potentiometric t illation of gallium ions.