EVALUATION OF THE COLLISION CELL TECHNOLOGY FOR CORRECTION OF POLYATOMIC INTERFERENCES IN THE DETERMINATION OF As, Cd, Co, Cr, Fe, Ni, Pb, Se AND V USING INDUCTIVELY COUPLED PLASMA QUADRUPOLE MASS SPECTROMETRY

The sample preparation is important stage required for the analysis of sample using the inductively coupled plasma mass spectrometry (ICP-MS) technique. Depending on the analytical task, different may be employed to minimize and / or eliminate possible spectral and non-spectral interference in elemental determination. An example could be of the formation the interference 35Cl16O+, 37Cl14N+ due to the medium containing of HCl and HNO3, resulting in formation of polyatomic ions that interfere in the analytical signals of 51V. In the case of arsenic determination, which is monoisotopic, the formation of 40ArCl35+ strongly affects its determination in matrices with high concentrations of chloride. The aim of this work was to investigate the effect of the use of the reaction/collision cell (CCT) to eliminate and/or minimize polyatomic interferences in the determination of As, Cd, Co, Cr, Fe, Ni, Pb, Se and V by ICP-MS. All ICP-MS measurements were performed using standard mode and collision cell technology (CCT) introducing 8.0% (v v-1) H2 in He as collision gases. The study was carried out in the presence of nitric acid or hydrochloric acid in two concentrations, 0.1 and 1.0 mol L-1. The results showed that the isotopes 111Cd, 59Co, 52Cr, 58Ni, 60Ni, 82Se, 208Pb it is possible to determine in both reactional media independent of concentration without the use of the collision cell. The results for 53Cr and 75As showed similar behavior in the presence of 1.0 mol L-1 HCl, indicating that the higher the amount of chloride present in the medium cause the spectral interference being necessary the use of the collision cell. For the isotopes 51V, 56Fe, 57Fe and 78Se the use of the CCT is also recommended in both reactive medium independent of the acid concentration due to interference.