Abstract
Errors in element concentration measurement due to the effect of various matrix components have been reported in inductively coupled argon plasma emission spectroscopy (ICP-AES) analyses, optimised for simultaneous multielement determination. Two methods of correcting for these errors were examined by the use of six elements selected as internal standards, viz. As, Cd, Mn, Mo, Ni and Se. Both the usual internal standard ratio method and the analysis of covariance method were efficacious in reducing the influence of matrix components (K, Ca, NaSio 3, polymaleic acid (PMA) and diethylenetriaminepentaacetic acid (DTPA)) on analyte determination. Any one of As, Cd, Mn, Mo or Se could be used to correct for the main effects of NaSiO 3 and DTPA; Cd or Mo for K; but Cd + Mo + As are necessary to correct for Ca over the range used. Except for Al and Mg, element measurements could be corrected for PMA effects by Cd + Mo + Se.
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