Microwave-Assisted Vapor-Phase Acid Digestion of Cellulose Nitrate Filters for Elemental Analysis of Airborne Dust Samples
✍ Scribed by Zs. Czégény; B. Berente; M. Óvári; M.Garcı́a Tapia; Gy. Záray
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 69 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0026-265X
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✦ Synopsis
A microwave-assisted vapor-phase digestion procedure was developed for microanalytical investigation of airborne dust samples collected on cellulose nitrate filters. The decomposition of a filter placed in a quartz microvial was carried out by oxidation using a mixture of HNO 3 and H 2 O 2 in a closed Teflon bomb. To avoid charring of the filter the temperature was increased from 25 to 180°C in five steps over 97 min. The decomposition rate of cellulose nitrate amounted to 95%. Recovery of Ni, V, Pb, Pt, and Pd ranged from 85 to 94%. The applicability of this sample preparation procedure resulting in 1 ml solution was demonstrated by investigation of airborne dust samples collected in the Clark tunnel in Budapest using total reflection X-ray fluorescence spectrometry.