Cobalt(II) selective membrane electrode based on palladium(II) dichloro acetylthiophene fenchone azine

A new cobalt(II) ion selective electrode based on palladium(II) dichloro acetylthiophene fenchone azine(I) has been developed. The best membrane composition is found to be 10:60:10:21.1 (I)/PVC/NaTPB/DOP (w/w). The electrode exhibits a Nerstian response in the range of 1.0 × 10−1–1.0 × 10−6 M with a detection limit and slope of 8.0 × 10−7 M and 29.6 ± 0.2 mV per decade respectively. The response time is within the range of 20–25 s and can be used for a period of up to 4 months. The electrode developed reveals good selectivity for cobalt(II) and could be used in pH range of 3–7. The electrode has been successfully used in the determination of cobalt(II) in water samples.