Abstract
Derivative spectrophotometry was applied to solid-phase spectrophotometry in order to enhance its sensitivity and remove the large background caused by the absorbance of the resin layer. Determination of micro-amounts of tungsten with pyrocatechol violet to form a 2∶1 green complex in acid medium which is fixed on a dextran-type anion-exchange resin (Sephadex QAEA-25) is described as an example for the application of this technique. The absorbance of the resin packed in a 1-mm spectrophotometric cell, was measured directly. The characteristic peak amplitude of the signal at 674 nm in the first-derivative spectrum is useful for quantitative determination of tungsten (3–16 μg 1−1; RSD 5.8%) in natural and industrial water samples.
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Pascual-Reguera, M.I., Molina-Diaz, A., Pacheco-Castillo, M.C. et al. Determination of tungsten with pyrocatechol violet by first-derivative solid-phase spectrophotometry. Mikrochim Acta 112, 225–235 (1994). https://doi.org/10.1007/BF01242838
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DOI: https://doi.org/10.1007/BF01242838