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Details van artikel 39 van 52 gevonden artikelen
| Titel: |
Quantitative analysis of organic wastes: Effects of sample preparation in the determination of metals |
| Auteur: |
Moral, R. Pedreno, J. Navarro Gomez, I. Mataix, J. |
| Verschenen in: |
Communications in soil science and plant analysis |
| Paginering: | Jaargang 27 (1996) nr. 3-4 pagina's 753-761 |
| Jaar: |
1996-02 |
| Inhoud: |
One of the most important analytical problems is the sample preparation to measure the total concentration of elements. Ashing procedure and microwave preparation are two important methods used. Ashing procedure is based in the mineralization of the sample in a furnace for 6 to 8 hours at 400 to 500°C followed by acid dissolution. Microwave digestion is based in an acid attack of the sample favoured by electrothermal radiation for some minutes. Organic residues are often used as soil amendments in agriculture. Some of them like sewage sludge and urban residues have heavy metals in their composition. It is important to measure them in order to establish their adequate use and minimize the potential environmental pollution. In this work, cadmium (Cd), cobalt (Co), chromium (Cr), copper (Cu), manganese (Mn), nickel (Ni), lead (Pb), and zinc (Zn) were analyzed in six residues from agriculture (almonds residue), cities (urban refuses from Madrid and Gandia-Valencia), and three sewage sludge from a tourist town (Benidorm), an industrial town (Onteniente) and Madrid. Two certified reference material were also analyzed (sewage sludges: BCR-144 and BCR-146). These samples were mineralized by both procedures commented and total concentration of metals were determined using inductively coupled plasma emission spectrometry (ICP-AES). Results showed relatives differences depending on the metal and the kind of waste material mineralized. Lead was not affected by the preparation method. Lower values of Cd were usually found in the microwave mineralization than ashing procedure; however, Zn and Cr seemed to be detected in major quantities in the microwave solution. Poor differences were observed for the rest of the elements analyzed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 39 van 52 gevonden artikelen
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