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Matrix effect on the Determination of Inorganic Priority Pollutants in Sludges
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1998, v.11 no.4, pp.297-304
Lee,
H., &
Lee,
S.
(1998). Matrix effect on the Determination of Inorganic Priority Pollutants in Sludges. Analytical Science and Technology, 11(4), 297-304.
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Abstract
The three analysis methods, EPA method 3050, the method offered by Ministry of Environment in Korea, and modified method corrected in this laboratory, were studied to investigate the effect of matrix on the analysis of inorganic priority pollutants. 7 inorganic priority pollutants(Ni, Cr, Cu, Zn, Pb, Cd, Hg) were spiked to the plating, leather, paper, electric, and dye sludges. Mean recovery of the elements except Hg was 95.5% when the procedure of EPA method was applied. However, recovery by the two other extraction methods showed 11.1% and 27.7%, respectively. Digestions were done by MDS (microwave digestion system) and <TEX>$HNO_3+HClO_4$</TEX> methods. To study organic and inorganic matrix effect, samples were made by adding triethanol amine as a organic matrix and <TEX>$FeCl_3{\cdot}6H_2O$</TEX>+<TEX>$AlCl_3{\cdot}6H_2O$</TEX> as a inorganic matrix, respectively. The extracts were analyzed by AAS and HG-AAS. Mean recovery of the elements by the <TEX>$HNO_3+HClO_4$</TEX> procedure, except Hg, gave better result than that of the MDS method. Mean recovery of elements was decreased when organic and inorganic matrices were added in the sludge samples. The procedure of MDS and <TEX>$HNO_3+HClO_4$</TEX> digestion gave higher recoveries than that of direct analysis. In general, the results of the studies showed a significant matrix effect on the inorganic priority pollutants analysis in sludges.
- keywords
- Inorganic priority pollutants, Sludges, Matrix effects
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