Aqueous Fe3+ can be quantified spectrophotometrically at 360 and 500 nm following its quantitative extraction from SO4 2– medium by Cyanex 302. Beer’s law is followed (up to 50 ppm Fe3+) provided (i) a 5 min phase agitation is used, (ii) aqueous pH(ini) in extraction is kept at 2.9 ± 0.05, and (iii) [Cyanex 302] = 0.30% (v/v). The color is stable for at least 2 months. The estimated ε360nm and ε500nm are 1820 and 970 l/mol∙cm, respectively. The tolerance limits of some cations and anions have been determined. The method has been applied in the analysis of some metallurgical samples.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 80, No. 6, p. 967, November–December, 2013.
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Biswas, R.K., Ali, M.R., Karmakar, A.K. et al. Extraction by Cyanex 302 and Spectrophotometric Estimation of Fe(III). J Appl Spectrosc 80, 983–990 (2014). https://doi.org/10.1007/s10812-014-9876-y
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DOI: https://doi.org/10.1007/s10812-014-9876-y