<b>Kinetic spectrophotometric determination of iron based on catalytic oxidation of <i>p</i>-acetylarsenazo</b>
A novel catalytic kinetic spectrophotometric method for the determination of iron is developed based on the catalytic effect of Fe(III) on the oxidation reaction of <i>p</i>-acetylarsenazo(ASA<i>p</i>A) by potassium periodate. Maximum absorbance of the Fe(III)−ASA&l...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2009-12-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
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| Online Access: | http://www.ajol.info/index.php/bcse/article/view/47669 |
| Summary: | A novel catalytic kinetic spectrophotometric method for the determination of iron is developed based on the catalytic effect of Fe(III) on the oxidation reaction of <i>p</i>-acetylarsenazo(ASA<i>p</i>A) by potassium periodate. Maximum absorbance of the Fe(III)−ASA<i>p</i>A−KIO<sub>4</sub> system in 8.0 × 10<sup>-3</sup> M sulfuric acid occurs at the wavelength of 540 nm. The change in absorbance (ΔA) is linearly related with the concentration of iron(III) in the range of 0.10−4.0 ng/mL and fitted the equation: ΔA = 4.91 × 10<sup>-2</sup> C (C: ng/mL) + 0.017, with a regression coefficient of 0.9966 at the wavelength. The detection limit of the method is 0.031 ng/mL. The relative standard deviation of the method was from 1.34% to 1.78% for 11 replicate determinations. The standard addition recovery of the method ranged from 95.71% to 103.3%. The method was used to determine iron in the black gingili paste, oat slice, sleeve-fish silk food samples. The determined results were in agreement with those by atomic absorption spectrometry. |
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| ISSN: | 1011-3924 1726-801X |