Copper Amalgam Working Electrode for Voltammetric Determination of Selenite

Abstract:

Selenium is one of the heavy metal pollutants in the aquatic environment. Selenite is a form of inorganic selenium, which is very poisonous to living things. Therefore, we need a method that selectively identify selenite to determine its concentration in water. In this study, a square wave stripping voltammetry was used to measure selenite concentration using copper amalgam working electrode. The optimum measurement parameters were obtained at a deposition potential of –450 mV and a deposition time of 800 seconds. This analysis method had good precision with a relative standard deviation (% RSD) of 4.89%. Linear calibration curves are shown in the range 0.03 mM – 0.10 mM with R² of 0.988 and in the range of 0.10 mM – 0.70 mM with R² of 0.995 and a detection limit of 9.0 µM. The standard selenite solution was measured with a recovery percentage of 96.67%. The same solution was measured using the HG-AAS method and the recovery percentage was 96.35%. Statistical tests using the t-test showed that the two results did not have a significant difference with a 95% confidence limit. Thus, the voltammetry method using copper amalgam working electrode can be used as an alternative method for determining selenite, as it is cheaper and simpler than the HG-AAS method.

• Periodical: Key Engineering Materials (Volume 874)
• Pages: 35-44
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.874.35
• Online since: January 2021
• Authors: Ria Sri Rahayu*, Meuthia Khelfa Pramesti, Adib Hasanawi, Dian Ayu Setyorini, Muhammad Yudhistira Azis
• Keywords: Copper Amalgam, Selenite, Stripping Voltammetry

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