Laser Ablation ICP-MS
The RESOlution M-50LR (Australian Scientific Instruments, Inc.) at the Pacific Centre for Isotopic and Geochemical Research at the University of British Columbia is a Class I laser device equipped with a UV excimer laser source (Coherent COMPex Pro 110, 193nm). The powerful laser head and sophisticated optical system allow for the ablation of a wide range of geological and environmental materials at high resolution and low absorbance. High sampling resolution is assured with spot sizes from 5 to 200 μm. A recent upgrade of the sample stage (‘z-stage’) enables an accurate beam focus even on rough sample surfaces. In addition, a unique two-volume cell developed by Laurin Technic Pty. Ltd. (Australia) provides high sensitivity, low fractionation and short wash-out times as well as fast sample throughput. PCIGR keeps at hand a second complete sample chamber and introduction accessories in order to separate high-matrix work from measurements at ultra-low levels and hence avoid cross-contamination. Samples of various dimensions such as microscopic slides, mineral mounts, thick rock sections, slices of speleothems, drill cores and samples of irregular shape may be investigated via multiple sample holder.
At PCIGR, the RESOlution laser system can be connected to an Agilent 7700 Series quadrupole ICP-MS and to the HR-SF-ICPMS Nu AttoM (Nu Instruments, Inc.). The Q-ICPMS incorporates a newly developed 3rd generation collision/reaction cell used in helium mode and offering higher sensitivity, lower backgrounds and more effective polyatomic interference removal of complex sample matrices. The HR-SF-ICPMS Nu Attom enables high-precision elemental and isotopic analyses at low concentration levels. Most applications at present comprise the analyses of low-level trace element concentrations in quartz veins and mineral grains, investigations of mineral zonation and geochronological work on zircons. Recently, we analyze growth rings of mussel shells and ototliths for their trace element variations. One focus of the laser work at PCIGR is the development and testing of appropriate standard and reference materials for the application in microanalytical work by laser ablation.