Fabrication of new Cu2+ ion selective electrode for the analysis of waste water samples

In the first, zinc hydroxide Nanoparticle loaded on activated carbon (Zn(OH)2-NP-AC) has been synthesized and characterized by different techniques including XRD and SEM. Then the resulting Zn(OH)2-NP-AC was used to construct copper ion selective carbon paste electrode (CPE) for determination of copper in different water and waste water samples. The influences of variables including sodium tetraphenylborate (NaTPB), amount of Zn(OH)2-NP-AC, Nujol, carrier and graphite powder on electrode response has been investigated and their value was set as graphite powder: Zn(OH)2-NP-AC: NaTPB: Nujol: Carrier in the mass (mg) ratio of 100/50/3/50/5. The electrode response was independent of pH in the range of 2.5-5.0 with a short the response time of about 6 s. The potentiometric selectivity coefficients of proposed copper-selective electrode towards various interfering ions were determined by fixed interference method (FIM) and separate solution method (SSM). The proposed electrode was successfully applied to the determination of Cu2+ in water and waste water samples

Keywords:

Zinc hydroxide nanoparticles , Carbon paste electrode , Cu2+-selective electrode , potentiometry