Digestion methods for analysis of fly ash samples by atomic absorption spectrometry

The efficiency of different digestion methods (six microwave decomposition methods and a wet acid digestion method) in the solubilisation of six metals (Cr, Ni, Cu, Pb, Cd, Zn), for their determination in fly ashes, was compared. Five different mineral acid mixtures and two different microwave syste...

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Bibliographic Details
Published inAnalytica chimica acta Vol. 395; no. 1; pp. 157 - 163
Main Authors Mester, Z., Angelone, M., Brunori, C., Cremisini, C., Muntau, H., Morabito, R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 16.08.1999
Elsevier
Subjects
Analysis methods
Analytical chemistry
Applied sciences
Atmospheric pollution
Atomic absorption spectrometry
Chemistry
Exact sciences and technology
Fly ash
Metals
Microwave digestion
Pollution
Spectrometric and optical methods
Fly ash
Microwave digestion
Metals
Atomic absorption spectrometry
Chemical analysis
Solubilization
Inorganic element
Certified reference material
Environmental control
Multicomponent analysis
Sample preparation
Microwave oven
Mineralization
Acid digestion
Air pollution
Quantitative analysis
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Summary:The efficiency of different digestion methods (six microwave decomposition methods and a wet acid digestion method) in the solubilisation of six metals (Cr, Ni, Cu, Pb, Cd, Zn), for their determination in fly ashes, was compared. Five different mineral acid mixtures and two different microwave systems were tested. The study was carried out by analyzing two highly homogenised fly ash samples (from sewage sludge and city waste incineration) provided by the Joint Research Centre of Ispra. Determinations were performed by atomic absorption spectrometry and by inductively coupled plasma atomic emission spectrometry. The analytical performance of the laboratory was evaluated using the 1633a Coal Fly Ash Standard Reference Material of National Bureau of Standards (NBS SRM 1633a). Results showed that a HNO 3 microwave treatment was strong enough to solubilise metals from the considered fly ashes. Moreover, microwave methods generally provided higher release than the classical aqua regia method, whereas no significant advantage was observed using a high performance microwave unit.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(99)00342-6