Abstract
The anionic chelate of iron(III)-2,2′-dihydroxyazobenzene (H2L), [FeL2]−, formed 1∶ 1 ion-pair with crystal violet cation (CV+), CV+ [FeL2]−, and was adsorbed on a surface of transparent polyvinyl chloride (PVC) film plasticized with di-n-octyl phthalate. Enrichment of the blue violet species of the ion-pair onto the transparent PVC film has enabled a highly sensitive and simple method for the determination of iron(III). The detection limits are 1 × 10–8 mol dm−3 (0.6 ppb) by spectrophotometry at 592 nm, and 4 × 10–8 mol dm−3 (2 ppb) by visual colorimetry. The method has been successfully applied to the determination of iron in water samples and human serum. No preparatory procedures for the separation of serum protein and other coexisting substances are required, since ion-pair adsorption process provides a new method to prevent interference of serum matrix.
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Kaneko, E., Tanno, H. & Yotsuyanagi, T. Ion-pair adsorption film colorimetry of iron (III) in water samples and human serum. Mikrochim Acta 103, 37–44 (1991). https://doi.org/10.1007/BF01245050
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DOI: https://doi.org/10.1007/BF01245050