Aksar, Burak; Kanberoglu, Gulsh Saydan; Coldur, Fatih

Accurate and dependable measurement of bismuth is vital for ensuring the safety of drugs, managing industrial processes, and evaluating environmental pollution. In this study, a new potentiometric sensor that uses Sudan I as the electroactive material within poly(vinyl chloride) (PVC) membrane structure was designed. The sensor displayed a broad linear concentration range of 1.0 ×10-3 to 1.0 ×10-10 M, an ultra-low detection limit of 4.0 ×10-11 M, and a response time of 30 seconds. It retained stable performance across a pH range of 2.0–7.0 and had an operational lifetime of about one month. When compared to existing literature, the sensor's selectivity and detection limit were significantly enhanced. It was successfully utilized to determine bismuth species in pharmaceutical formulations. Potentiometric methods provide clear advantages over other analytical techniques, such as simplicity, cost-effectiveness, quick response, and high selectivity. This developed sensor is a valuable tool for bismuth(III) determination, especially in quality control and pharmaceutical analysis.

Topcu, Cihan; Coldur, Fatih; Andac, Muberra; Cubuk, Osman; Kanberoglu, Gulsah Saydan; Caglar, Bulent; Isildak, Ibrahim

A polyvinylchloride (PVC) membrane silver(I) selective electrode was developed for the determination of silver(I) ions in photographic film developing solutions. The electrode was embedded into a home-made flow cell and successfully used as a potentiometric detector in a flow injection potentiometric (FIP) system. Under the optimized flow injection conditions, the electrode exhibited a non-Nernstian slope of 67.20±0.80 mV in the linear range from 1.0×10-5 to 1.0×10-1 mol/L (R2=0.9961) and the lowest value for limit of detection (LOD) was calculated as 7.1×10-6 mol/L. The electrode displayed good sensitivity, selectivity, repeatable and rapid response towards silver(I) ions. Lifetime of the electrode was determined as at least two months in FIP system. The electrode was also successfully applied for the potentiometric determination of silver(I) ions in photographic film developing solution samples in FIP system. The results attained from FIP system were compared with the atomic absorption spectrophotometry (AAS) results by using student's t-test at 95 % confidence level and relative deviation (RD) between the two methods was < 8 %.