The determination of dissolved chromium(III) and chromium(VI) and particulate chromium in waters at μg l-1 levels by thin-film x-ray fluorescence spectrometry
| Autor: | A.J. Pik, J.M. Eckert, K.L. Williams |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
inorganic chemicals
Detection limit food.ingredient Sea salt Inorganic chemistry Fluorescence spectrometry chemistry.chemical_element X-ray fluorescence Particulates Biochemistry Analytical Chemistry law.invention Chromium chemistry.chemical_compound food chemistry law Environmental Chemistry Hydroxide Spectroscopy Filtration |
| Zdroj: | Analytica Chimica Acta. 124:351-356 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/s0003-2670(01)93582-2 |
| Popis: | A method is described for the determination of particulate chromium and dissolved chromium(III) and (VI) in water at μg l-1 levels. Particulate material is collected by filtration of the water sample through a membrane filter (0.4-μm pore-size). Chromium(III) and chromium(VI) are then coprecipitated, separately and in that order, with iron(III) hydroxide (at pH 8.5) and a cobalt—pyrrolidinedithiocarbamate carrier complex (at pH 4.0). Both precipitates are collected as thin films on membrane filters and, with the particulate material, analysed directly for chromium by x-ray fluorescence spectrometry. Detection limits, for a 100-ml water sample and counting times of 100 s, are 0.1 μg Cr l-1. The method is unaffected by sea salt and is applicable, without modifications, to river and estuarine waters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|