Spectrophotometric study of iron oxidation in the iron(II)/thiocyanate/acetone system and some analytical applications
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidade Estadual Paulista Júlio de Mesquita Filho
2005
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| _version_ | 1876445652857126912 |
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| author | F. G. Martins |
| author_facet | F. G. Martins |
| contents | Spectrophotometric study of iron oxidation in the iron(II)/thiocyanate/acetone system and some analytical applications F. G. Martins J. F. Andrade A. C. Pimenta L. M. Lourenço J. R. M. Castro V. R. Balbo Química III) iron(II oxidation thiocyanate acetone system The possibility of using thiocyanate to determine iron(II) and/or iron(III) in water-acetone mixturehas been re-examined as part of a systematic and comparative study involving metallic complexes ofpseudohalide ligands. Some parameters that affect the complete oxidation of the ferrous cations, theirsubsequent complexation and the system stability have been studied to optimize the experimental conditions.Our results show the viability and potentiality of this simply methodology as an alternative analytical procedureto determine iron cations with high sensitivity, precision and accuracy. Studies on the calibration, stability,precision, and effect of various different ions have been carried out by using absorbance values measured at480 nm. The analytical curve for the total iron determination obeys Beers law (r = 0.9993), showing a highersensitivity (molar absorptivity of 2.10x104 L cm-1 mol-1) when compared with other traditional systems (ligands)or even with the similar azide ion [1.53x104 L cm-1 mol-1, for ironIII/azide complexes, in 70% (v/v)tetrahydrofuran/water, at 396 nm]. Under such optimized experimental conditions, it is possible to determineiron in the concentration range from 0.5 to 2 ppm (15-65% T for older equipments, quartz cells of 1.00 cm).Analytical applications have been tested for some different materials (iron ores), also including pharmaceuticalproducts for anemia, and results were compared with atomic absorption determinations. Very good agreementwas obtained with these two different techniques, showing the potential of the present experimental conditionsfor the total iron spectrophotometric determinations (errors < 5%). The possibility of iron speciation wasmade evident by using another specific and auxiliary method for iron(II) or (III). 2005 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42930308 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.3 Vol.30 |
| format | Artículo científico |
| id | redalyc_42930308 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universidade Estadual Paulista Júlio de Mesquita Filho |
| spellingShingle | Spectrophotometric study of iron oxidation in the iron(II)/thiocyanate/acetone system and some analytical applications F. G. Martins Química III) iron(II oxidation thiocyanate acetone system Spectrophotometric study of iron oxidation in the iron(II)/thiocyanate/acetone system and some analytical applications F. G. Martins J. F. Andrade A. C. Pimenta L. M. Lourenço J. R. M. Castro V. R. Balbo Química III) iron(II oxidation thiocyanate acetone system The possibility of using thiocyanate to determine iron(II) and/or iron(III) in water-acetone mixturehas been re-examined as part of a systematic and comparative study involving metallic complexes ofpseudohalide ligands. Some parameters that affect the complete oxidation of the ferrous cations, theirsubsequent complexation and the system stability have been studied to optimize the experimental conditions.Our results show the viability and potentiality of this simply methodology as an alternative analytical procedureto determine iron cations with high sensitivity, precision and accuracy. Studies on the calibration, stability,precision, and effect of various different ions have been carried out by using absorbance values measured at480 nm. The analytical curve for the total iron determination obeys Beers law (r = 0.9993), showing a highersensitivity (molar absorptivity of 2.10x104 L cm-1 mol-1) when compared with other traditional systems (ligands)or even with the similar azide ion [1.53x104 L cm-1 mol-1, for ironIII/azide complexes, in 70% (v/v)tetrahydrofuran/water, at 396 nm]. Under such optimized experimental conditions, it is possible to determineiron in the concentration range from 0.5 to 2 ppm (15-65% T for older equipments, quartz cells of 1.00 cm).Analytical applications have been tested for some different materials (iron ores), also including pharmaceuticalproducts for anemia, and results were compared with atomic absorption determinations. Very good agreementwas obtained with these two different techniques, showing the potential of the present experimental conditionsfor the total iron spectrophotometric determinations (errors < 5%). The possibility of iron speciation wasmade evident by using another specific and auxiliary method for iron(II) or (III). 2005 artículo científico 0100-4670 https://www.redalyc.org/articulo.oa?id=42930308 en http://www.redalyc.org/revista.oa?id=429 Eclética Química application/pdf Universidade Estadual Paulista Júlio de Mesquita Filho Eclética Química (Brasil) Num.3 Vol.30 |
| title | Spectrophotometric study of iron oxidation in the iron(II)/thiocyanate/acetone system and some analytical applications |
| topic | Química III) iron(II oxidation thiocyanate acetone system |
| url | https://www.redalyc.org/articulo.oa?id=42930308 |