MULTIELEMENT OPTIMIZATION OF THE OPERATING PARAMETERS FOR INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY WITH A CHARGE INJECTION DEVICE DETECTOR FOR THE ANALYSIS OF SAMPLES DISSOLVED IN ORGANIC-SOLVENTS

A multi-element optimization of the operating parameters for simultane ous ICP-AES with a CID detector for the analysis of samples dissolved in organic solvents was carried out. Some statistical experimental des igns were used to evaluate the influence of the operating parameters o n the effect of volatile organic solvents and to obtain the best plasm a conditions for multi-element analysis, The lower limit of detection mas used as the optimization criteria, A factorial study showed that n ebulizer pressure is the factor that strongly affects the signal-to-ro ot background ratio of the elements under study. The best operating co nditions of the plasma for simultaneous determination were obtained us ing some objective functions reported in the literature, it multi-elem ent analysis of NIST SRM 1085 a Wear Metals in Oil,vas accomplished us ing the plasma operating conditions established by the simultaneous op timization. No statistically significant differences were observed bet ween the measurements made and the certified values, The precision of the method was in the range 1-3% expressed as RSD percentage.