METHOD VALIDATION OF TRACE ELEMENTS IN WATER BY ATOMIC ABSORPTION SPECTROMETER DETERMINATION | ||
| Journal of Plant Protection and Pathology | ||
| Article 4, Volume 3, Issue 3, March 2012, Pages 239-251 PDF (474.14 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jppp.2012.83757 | ||
| Author | ||
| Mona A. Khorshed* | ||
| Ministry of Agric., Agric. Res. Centre, Central Laboratory of Residue analysis of Pesticides and Heavy Metals in Food, Dokki, Egypt. | ||
| Abstract | ||
| An analytical method for determination of the dissolved trace elements; copper (Cu), iron (Fe), Zinc (Zn), manganese (Mn), Cadmium (Cd), Lead (Pb), Arsenic (As), Mercury (Hg), Cobalt (Co), Chromium (Cr), and Nickel (Ni) in the water samples (primarily drinking water); had been validated and introduced into the scope of the Central Laboratory of Residue analysis of Pesticides and Heavy Metals in Food . The acidified water samples were analyzed by direct aspiration by atomic absorption spectroscopy (flame or electro thermal vaporization) for total metals determination without digestion. The analytical parameters of the method such as limit of quantification and linearity have been investigated. The limits of quantitation were found to be 0.1, 0.05. 0.1, 0.005, 0.3, 2, 1, 1, 0.05, 0.1, and 0.05 mg/L for Cu, Fe, Mn, Zn, Cd, Pb, As, Hg, Co, Cr and Ni, respectively. The method showed to be linear from the LOQ levels up to 4, 5, 2, 1, 0.004, 0.03, 0.04, 0.04, 6, 5, and 5 mg/L levels for Cu, Fe, Mn , Zn, Cd, Pb, As, Hg, Co, Cr and Ni, respectively. The average recoveries of Cu, Fe, Mn, Zn, Cd, Pb, As, Hg, Co, Cr and Ni at different levels varied between 70 and 120%. The reproducibility expressed as relative standard deviation of all tested elements was less than 20 %. The measurement uncertainty expressed as expanded uncertainty in terms of relative standard deviation at 95% confidence level for all elements is within the range 15.9%, 31.4%, 16.1%, 29.6% , 26.8%, 26%, 32.6%, 30%, 5.1%, 3.1%, 8.2% for Cu, Fe, Mn, Zn, Cd, Pb, As, Hg, Co, Cr and Ni, respectively. | ||
| Keywords | ||
| Method validation; trace elements; water; atomic absorption spectroscopy; determination | ||
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