Abstract
A novel approach for the elimination of isobaric interferences in quadrupole-ICP-MS is described. In this work the removal of HfO+, the main interference, from platinum determination using a new method is proposed. Selective retention of hafnium on activated silica capillaries during the sample introduction step with a direct injection nebulizer (DIN) has been obtained. The influence of the activation of the fused silica surface of the sample capillary of the DIN has been investigated. While the hafnium has shown an interaction with the negatively charged surface, resulting in retention inside the capillary, the interaction with platinum was negligible. The retained hafnium could be removed after platinum detection by flushing the capillary with 2.5 µL of 1.7 mol L−1