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543.42.062A highly sensitive and selective first-derivative spectrophotometric method has been developed for the determination of aluminum and iron in mixtures. The method is based on the formation of the binary complexes of aluminum and iron with Alizarin yellow R (AYR) 5- [4-nitrophenylazo]salicylic acid at pH 2.0 with molar absorptivity of 1.1⋅10 4 l⋅mol -1 ⋅cm -1 . A zero-crossing technique is found suitable for the direct measurement of the first derivative value at the specified wavelength, so aluminum and iron were thus determined in the ranges 1.3-5.4 μg/ml and 1.1-8.3 μg/ml, respectively, in the presence of both components. The detection limits were found to be 1.4 ng/ml for aluminum and 2.8 ng/ml for iron. The relative standard deviations were in all cases less than 1.5%. The proposed method was successfully applied for the simultaneous determination of aluminum and iron in certified reference aluminum samples.Introduction. The chemistry of aluminum and iron is of great importance due to their presence in many alloys and steels, different drugs, plants, environmental waters, soils, and their biological activities in human body. Low amounts of aluminum can cause human acute toxicity. The role of iron is not invisible both in nearly all production sectors, with the metal industry in the first place, and in biological systems despite its presence at trace levels. High iron levels in drinking water in addition to its toxicity can result in poor taste and in staining of laundry, glassware, and dishes [1]. So, much attention is paid to the determination of both elements in different media by different ways at trace and sub-trace levels. Some of these ways are AAS methods and the volumetric determination [2], absorptive stripping voltametry (ASV), and graphite furnace atomic absorption spectrometry (GFAAS) [3]. The most acceptable ICP-MS analytical techniques and chromatography [4] have been reported for the determination of iron and aluminum. The spectrophotometric technique is always an acceptable analytical method due to its precision and accuracy and its lower cost compared with other techniques.The simultaneous determination of multicomponents by the use of traditional UV-Vis spectrophotometric techniques is difficult without any separation process because of overlapping absorption spectra. Derivative techniques in the ultraviolet-visible region are very useful when overlap or interference exists; they offer a powerful tool for both qualitative and quantitative analysis of mixtures [5]. Derivative spectroscopy also permits one to resolve and determine binary mixtures of constituents [6][7][8][9][10][11][12]. Diverse computer programs have been applied to the analysis of multicomponent solutions using derivative spectra [13]. There were a lot of papers on the determination of different metals and components by derivative methods, which were collected by C. B. Ojeda [14]. Simultaneous determination of aluminum and iron in one shot in an easy way, with good static values and low interference from other metal...
543.42.062A highly sensitive and selective first-derivative spectrophotometric method has been developed for the determination of aluminum and iron in mixtures. The method is based on the formation of the binary complexes of aluminum and iron with Alizarin yellow R (AYR) 5- [4-nitrophenylazo]salicylic acid at pH 2.0 with molar absorptivity of 1.1⋅10 4 l⋅mol -1 ⋅cm -1 . A zero-crossing technique is found suitable for the direct measurement of the first derivative value at the specified wavelength, so aluminum and iron were thus determined in the ranges 1.3-5.4 μg/ml and 1.1-8.3 μg/ml, respectively, in the presence of both components. The detection limits were found to be 1.4 ng/ml for aluminum and 2.8 ng/ml for iron. The relative standard deviations were in all cases less than 1.5%. The proposed method was successfully applied for the simultaneous determination of aluminum and iron in certified reference aluminum samples.Introduction. The chemistry of aluminum and iron is of great importance due to their presence in many alloys and steels, different drugs, plants, environmental waters, soils, and their biological activities in human body. Low amounts of aluminum can cause human acute toxicity. The role of iron is not invisible both in nearly all production sectors, with the metal industry in the first place, and in biological systems despite its presence at trace levels. High iron levels in drinking water in addition to its toxicity can result in poor taste and in staining of laundry, glassware, and dishes [1]. So, much attention is paid to the determination of both elements in different media by different ways at trace and sub-trace levels. Some of these ways are AAS methods and the volumetric determination [2], absorptive stripping voltametry (ASV), and graphite furnace atomic absorption spectrometry (GFAAS) [3]. The most acceptable ICP-MS analytical techniques and chromatography [4] have been reported for the determination of iron and aluminum. The spectrophotometric technique is always an acceptable analytical method due to its precision and accuracy and its lower cost compared with other techniques.The simultaneous determination of multicomponents by the use of traditional UV-Vis spectrophotometric techniques is difficult without any separation process because of overlapping absorption spectra. Derivative techniques in the ultraviolet-visible region are very useful when overlap or interference exists; they offer a powerful tool for both qualitative and quantitative analysis of mixtures [5]. Derivative spectroscopy also permits one to resolve and determine binary mixtures of constituents [6][7][8][9][10][11][12]. Diverse computer programs have been applied to the analysis of multicomponent solutions using derivative spectra [13]. There were a lot of papers on the determination of different metals and components by derivative methods, which were collected by C. B. Ojeda [14]. Simultaneous determination of aluminum and iron in one shot in an easy way, with good static values and low interference from other metal...
Ao amigo Dr. Mário Almir Feres pelas discussões científicas. A amiga Lidiane Nunes pela ajuda e amizade. Aos técnicos do laboratório de Química Analítica do CENA, Fátima, Yolanda e Mi pelo auxílio e, em especial à Sheila pela dedicação e amizade.
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