Determination of The Elements in Some Marine Mollusks and Algae Using X-Ray Fluorescence Analysis

X-ray fluorescence technique was optimized for multi-element determinations of some elements in mollusks and algae samples. The elements of S and Cl; K, Ca, Cr, and Mn; Fe, Ni, Cu, Zn, As, Br, Rb, Sr, and Pb were determined using three secondary targets namely Ti, Cu, and Mo, respectively. The validity of the X RF analysis was studied by the determination of the elements in two standard reference materials (SRMs): Plankton CRM 414 (BCR) and Sargasso No. 9 (NIES). However, the results of S, Cl, K, Ca, Ti, Cr, Mn, Fe, Cu, Zn, Br, and Rb determinations were very accurate with errors <10.0 %, while the errors obtained for Ni, As, and Pb were in the range of 11.5 % to 17.4 %. The results were also precise with relative standard deviations (RSD) better than 9.1 % for all elements, except Pb, which its RSD reached to 16.9 % as the result of the concentration decreases to the limit detection level. (author)