A surfactant-assisted nanodrop spectrophotometric (NDS) method has been developed for the determination of the iron(III) content in single drops (1 μL) of food, biological, and or environmental sample using disodium 1-nitroso-2-naphthol-3,6-sulfonate (Nitroso-R salt) as a complexing agent and Tween-80 as non-ionic surfactant at pH 4.0. This method is based on the formation of a complex between the Fe(III) present in a sample and the Nitroso-R-salt in the presence of a surfactant to form a green-colored Fe(III)–Nitroso-R salt complex, which can be measured using a NDS method at a λ max = 710 nm. This system was found to obey Beer’s law at concentrations in the range of 50–5000 μg/L with slope, intercept and correlation coefficient values of 0.683, 0.102, and 0.986, respectively. The molar absorptivity of the complex in terms of the Fe(III) content was determined to be 4.86 × 10 5 L·mol –1·cm –1 . The detection limit and %RSD values of the method were found to be 17 × 10–3 mg/L and ±1.3706%, respectively. This newly developed method was successfully applied to the determination of the Fe(III) content in single drops of food, biological, and environmental samples, and the results were compared with those obtained by atomic absorption spectrometry.
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Abstract of article is published in Zhurnal Prikladnoi Spektroskopii, Vol. 82, No. 6, p. 970, November–December, 2015.
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Sharma, A., Tapadia, K., Sahin, R. et al. Surfactant-Assisted Nanodrop Spectrophotometer Determination of Iron(III) in a Single Drop of Food, Biological, and Environmental Samples. J Appl Spectrosc 82, 1064–1071 (2016). https://doi.org/10.1007/s10812-016-0230-4
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DOI: https://doi.org/10.1007/s10812-016-0230-4