Abstract
An electrochemical method for Cu(II) determination, based on its reaction with indigo carmine (IC) in alkaline medium and differential pulse voltammetry performed at graphite electrode, was elaborated. The experimental parameters affecting the Cu(II) - IC complex formation (reaction time and pH) were optimized. The linear range of the calibration curve, obtaining by representing the IC oxidation current (Eappl = 0.175 V vs. Ag/AgCl,KClsat) versus the Cu(II) concentration (pH 10), was from 10 µM up to 70 µM Cu (II) and the detection limit was 4.74 µM.
Highlights
Monitoring trace or ultra trace copper in natural environment, biological and other real samples is very important, since the ingestion of copper can lead to toxicosis, affecting first the liver and later the central nervous system, kidneys and eyes [Barceloux. and Barceloux, 1999]
Current (Ipa) of indigo carmine (IC)/Dehydroindigo carmine (DHIC) redox couple induced by Cu(II) addition at different pH values
The maximum decrease of Ipa was observed at pH 11 (76%), but pH 10 was chosen as working pH, considering that: (i) at this pH the Ipa decrease was still significant (63%) and (ii) at pH 10 the buffering capacity of the carbonate solution is maximum
Summary
Monitoring trace or ultra trace copper in natural environment, biological and other real samples is very important, since the ingestion of copper can lead to toxicosis, affecting first the liver and later the central nervous system, kidneys and eyes [Barceloux. and Barceloux, 1999]. Monitoring trace or ultra trace copper in natural environment, biological and other real samples is very important, since the ingestion of copper can lead to toxicosis, affecting first the liver and later the central nervous system, kidneys and eyes [Barceloux. Because the concentration of copper is extremely low in various natural samples, a selective and sensitive method for reliable determination of copper would be of great interest. An electrochemical method for the determination of copper (II) by complexation with indigo carmine has been proposed. For this purpose, the oxidation current of indigo carmine in basic medium was measured in the presence and in the absence of Cu (II) ions. The decrease of the oxidation current of indigo carmine caused by the formation of an electro-inactive complex was studied. The experimental parameters were optimized, such as pH and time of reaction
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