Determination of arsenic in water samples by Total Reflection X-Ray Fluorescence using pre-concentration with alumina
| Autor: | Eduardo D. Greaves, Haydn Barros, Leonardo Bennun, Lué-Merú Marcó Parra |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Detection limit
Analyte Aqueous solution Chromatography technology industry and agriculture Analytical chemistry chemistry.chemical_element Substrate (chemistry) X-ray fluorescence equipment and supplies Atomic and Molecular Physics and Optics Analytical Chemistry Arsenic contamination of groundwater chemistry Slurry Instrumentation Spectroscopy Arsenic |
| Zdroj: | Spectrochimica Acta Part B: Atomic Spectroscopy. 65:489-492 |
| ISSN: | 0584-8547 |
| Popis: | The determination of arsenic in water samples requires techniques of high sensitivity. Total Reflection X-Ray Fluorescence (TXRF) allows the determination but a prior separation and pre-concentration procedure is necessary. Alumina is a suitable substrate for the selective separation of the analytes. A method for separation and pre-concentration in alumina, followed by direct analysis of the alumina is evaluated. Quantification was performed using the Al–Kα and Co–Kα lines as internal standard in samples prepared on an alumina matrix, and compared to a calibration with aqueous standards. Artificial water samples of As (III) and As (V) were analyzed after the treatment. Fifty milliliters of the sample at ppb concentration levels were mixed with 10 mg of alumina. The pH, time and temperature were controlled. The alumina was separated from the slurry by centrifugation, washed with de-ionized water and analyzed directly on the sample holder. A pre-concentration factor of 100 was found, with detection limit of 0.7 μgL − 1 . The percentage of recovery was 98% for As (III) and 95% for As (V) demonstrating the suitability of the procedure. |
| Databáze: | OpenAIRE |
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