Abstract
A simple and sensitive procedure for determining rhenium in 500-mL water samples with a detection limit of 0.2 μg/L was developed. The analysis took 15–20 min. The procedure was based on the dynamic preconcentration of perrhenate ions from neutral or weakly acidic solutions on disks made of a poly(acrylonitrile) (PAN) fiber and filled with an AV-17 ion exchanger (PAN–AV-17 adsorbent). After preconcentration, rhenium was determined at 420 nm from diffuse reflectance spectra of a colored thiocyanate complex that was obtained on treating the disks with a hydrochloric acid solution of potassium thiocyanate and tin(II). The procedure was tested in analyses of lake water and can be used in field conditions.
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