European Journal of Chemistry 2014, 5(1), 101-110. doi:10.5155/eurjchem.5.1.101-110.882

A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid


Tasnima Zannat (1) , Mohammed Jamaluddin Ahmed (2,*)

(1) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
(2) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong, 4331, Bangladesh
(*) Corresponding Author

Received: 18 Jul 2013, Accepted: 07 Sep 2013, Published: 31 Mar 2014

Abstract


An ultra-sensitive and highly selective non-extractive spectrophotometric method is presented for the rapid determination of iron (III) at trace levels using 1,2-dihydroxybenzene-3,5-disulfonic acid (Tiron) as a new spectrophotometric reagent (lmax = 665 nm) in slightly acidic aqueous (2×10-6 - 2×10-5 mol/L H2SO4) solution. The reaction is instantaneous and absorbance remains stable for over 24 h. The average molar absorption coefficient and Sandell’s sensitivity and detection limit were found to be 6.0×105 L/mol.cm, 10 ng/cm2, and 1 µg/L, respectively. Linear calibration graphs were obtained for 0.02-70.00 mg/L of Fe(III). The stoichiometric composition of the chelate is 2:3 (Fe(III):Tiron). Large excesses of over 50 cations, anions and complexing agents (e.g. Tartrate, oxalate, citrate, phosphate, thiourea, and thiocyanate) do not interfere in the determination. The method was successfully used in the determination of iron in several standard reference materials (Alloys and steels) as well as in some environmental waters (portable and polluted), biological samples (Human blood and urine), food, pharmaceutical and soil samples, solution containing iron (II) and iron (III) and some complex synthetic mixtures. The method has high precision and accuracy (s = ±0.01 for 0.5 mg/L).


Keywords


Tiron; Biological samples; Iron determination; Spectrophotometry; Environmental samples; Pharmaceutical samples

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DOI: 10.5155/eurjchem.5.1.101-110.882

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[1]. M. K. Das, V. V. Raut, S. B. Deb, S. Jeyakumar, M. K. Saxena, B. S. Tomar
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[2]. Tasnima Zannat, Mohammad Jamaluddin Ahmed
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How to cite


Zannat, T.; Ahmed, M. Eur. J. Chem. 2014, 5(1), 101-110. doi:10.5155/eurjchem.5.1.101-110.882
Zannat, T.; Ahmed, M. A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid. Eur. J. Chem. 2014, 5(1), 101-110. doi:10.5155/eurjchem.5.1.101-110.882
Zannat, T., & Ahmed, M. (2014). A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid. European Journal of Chemistry, 5(1), 101-110. doi:10.5155/eurjchem.5.1.101-110.882
Zannat, Tasnima, & Mohammed Jamaluddin Ahmed. "A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid." European Journal of Chemistry [Online], 5.1 (2014): 101-110. Web. 23 Oct. 2019
Zannat, Tasnima, AND Ahmed, Mohammed. "A simple and rapid spectrophotometric method for the determination of iron in environmental, biological, pharmaceutical, food and soil samples using 1,2-dihydroxybenzene-3,5-disulfonic acid" European Journal of Chemistry [Online], Volume 5 Number 1 (31 March 2014)

DOI Link: https://doi.org/10.5155/eurjchem.5.1.101-110.882

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