Trace elements analyses of zircon sample by integration of the LA-ICP-MS, EDS and RBS methods

Abstract

Zircon grains separated from the Mediterranean beach black sands in Northern Egypt were analyzed for their trace elements content using an integrated approach that utilizes the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), the Rutherford back scattering spectroscopy method (RBS) and the energy dispersive X-ray spectrometry (EDS). For the LA-ICP-MS analysis fused pellets have to be prepared by mixing powdered zircon grains with lithium borate and fusing the mixture at 1050 °C. The homogeneity of these pellets is of crucial importance in the analyses, and therefore, it was checked and assured using the RBS method. On the other hand, the EDS method was used to analyze the zircon grains directly without any fusion treatment. Data obtained by the depth profiling method on the fused pellets by the RBS method indicate satisfactory homogeneity. Data obtained by the LA-ICP-MS using four NIM standards indicate high precision and accuracy. On the other hand, the precision and accuracy of the analyses carried out by the EDS method are rather poor due to higher limits of detection for most of these elements.