COMPARATIVE STUDY OF COLORIMETRIC DETERMINATION AND SOLVENT EXTRACTION OF COPPER [II] WITH METHYLENE BLUE AND CRYSTAL VIOLET

Authors

  • E.O. Ojeka
  • A.I. Ambo
  • I. Hashim

Abstract

Methylene Blue and Crystal violet cationic dyes were evaluated as reagents for the extraction and spectrophotometric determination of copper. The method is based on the reduction of copper [II] to copper [I] with cyanide and the formation of dicyanocuprate [I] and its extraction into toluene as an ion associate with Methylene Blue [MB]. The result for Methylene blue was more reproducible than Crystal Violet [CV] dye. For copper determination, the absorbance of a toluene solution at 660 nm was measured against a reagent blank for Methylene blue and 530 nm for Crystal Violet, respectively. The apparent molar absorptivity, were 7.50× ô€€„ô€€…   ô€€†ô€€‡ô€€€ ô€€‡ô€€ˆô€€‰ô€€ô€€‚ ô€€Šô€€‡ô€€ô€€‚ for MB and 5.00× ô€€„ô€€… ô€€†ô€€‡ô€€€ ô€€‡ô€€ˆô€€‰ô€€ô€€‚ ô€€Šô€€‡ô€€ô€€‚ for CV, respectively at pH 6.60. Copper was determined in the range of 0.17-1.36 mg in 10 mL sample with a relative standard deviation of 0.83% in MB and 1.71% in CV for copper concentration of 6.0× ô€€„ô€€…ô€€ô€€ƒ M. The composition of the ion associate is probably MB+.Cu(CN)2-.KEYWORDS: Comparative, Colorimetric, Extraction, Methylene blue, Crystal violet

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Published

2020-05-23

How to Cite

Ojeka, E., Ambo, A., & Hashim, I. (2020). COMPARATIVE STUDY OF COLORIMETRIC DETERMINATION AND SOLVENT EXTRACTION OF COPPER [II] WITH METHYLENE BLUE AND CRYSTAL VIOLET. Journal of Chemical Society of Nigeria, 45(3). Retrieved from https://journals.chemsociety.org.ng/index.php/jcsn/article/view/481

Issue

Vol. 45 No. 3 (2020): J. Chem Soc. Nigeria

Section

Articles

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