Abstract
A sensitive and selective method is described for the determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode. The method involves a cotrolled preconcentration by accumulation of tin-catechol complexes on the electrode followed by stripping voltammetric measurement in the cathodic direction. The optimum conditions for the determination of tin by this method include the use of a rotated electrode at 1920 rpm, 0.10 M acetate buffer electrolyte (pH 2.4–4.7), 5 × 10 −4 M ctechol and an accumulation potential of −0.20 V vs. Ag/AgCl. A linear concentration range is obtained from 0 to 35 μg 1 −1 and the limit of detection is 0.5 μg 1 −1 for an accumulation period of 300 s. An interference study with various metal ions indicated that these substances generally do not interfere with the tin determination, except for Cu, Cd and Cr. the interference of Cu and Cd is eliminated by the addition of 1 × 10 −6 M EDTA into the solution. The interference of surface-active organic substances, e.g., Triton X-100, is overcome by UV irradiation of the sample for at least 2 h. The method was successfully employed for the determiation of tin in fruit juices. Comparison of the results obtained for the juices demonstrated reasonable agreement with those obtained by atomic adsorption spectrometry.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
