LUIZA CAPRA, MIHAELA MANOLACHE, ION ION, RUSANDICA STOICA, ALINA CATRINEL ION VALIDATION AND OPTIMIZATION OF A METHOD FOR SB DETERMINATION FROM BOTTLED NATURAL MINERAL WATERS BY ICP-OES In the present work, it was developed a simple, cheap and quick method for Sb determination from mineral water, using ICP-OES, using two different calibration proceedings: calibration curve method (CCM) and standard additions method (SAM). On the studied concentration range, the parameters such as the calibration curve slope, linearity expressed through correlation coefficient r = 0.9992, limits of detection LoD = 0.67 µg L-1 and quantification LoQ = 2.01 µg L-1, the standard deviation of repeatability of 0.25 µg L-1, the accuracy of 0.16 µg L-1 satisfy the performance criteria. The value of extended uncertainty with a confidence level of 95 % (k = 2), is 1.0 µg L-1 obtained for Sb content of 4.10 µg L-1. The mineral waters were analyzed also by the addition standard method. One of the advantages of this method is to eliminate interference from the matrix. By the method of standard additions, the detection limit decreased from LoD=0.67 µg L-1 to 0.16 µgL-1.