Application of Square Wave Adsorptive Stripping Voltammetry in the Temporal Variation of Trace Co(II), Ni(II), Cr(VI), and Mo(VI) Ions in Drinking Water Samples at Al-Baha City, Saudi Arabia

Objectives Trace Co(II), Ni(II), Cr(VI) and Mo(VI) ions in drinking water samples taken from eight sampling regions at Al–Baha city, Saudi Arabia, were assessed. Material and Methods square wave adsorptive stripping voltammetry (SWAdSV) with a domestic carbon paste electrode and graphite furnce atomic absorption spectrophotometric(GFAAS) techniques, were used. Samples of drinking water were taken from eight sampling regions at Al–Baha city, Saudi Arabia. The influence of various parametres were studied by means of the SWAdSV technique. Results The results obtained showed that the detection limits of the examined cations at 30 s deposition time (n = 5) are: 0.15 ng L -1 for Co(II), 0.05 ng L -1 for Ni (II), 0.2 ng L -1 for Cr(VI) and 3.2 ng L -1 for Mo(VI), respectively. The assesment of the examined cations in drinking water ranging from : for Co(II) (0.42–68.5 µg L -1 , n = 5), Ni(II) (0.29–0.87 µg L -1 , n = 5), Cr(VI) (1.5–22.35 µg L -1 , n = 5) and for Mo(VI) (0.58–2.58 µg L -1 , n = 5), respectively. The resulting data for studied cations are compared with those assessed by the graphite furnce atomic absorption spectrophotometric technique(GFAAS). Interfering between cations under analysis have been examined. Moreover, the storage of the studied samples was verified, and the results were agreement with the other processes. The accuracy of the proposed technique was attained via statistical analysis for the gained data. Conclusion The study concluded that most of the drinking water samples used were a very good agreement with the other processes.