INFLUENCE OF SAMPLE SURFACE CONDITION ON CHEMICAL-ANALYSIS USING LASER-ABLATION INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROSCOPY

The influence of sample surface condition on chemical analysis was inv estigated when using laser ablation sampling with inductively coupled plasma atomic emission spectroscopy (ICP-AES), The ablated mass quanti ty and composition were found to be significantly different from origi nal vs, pre-ablated surfaces. The ablated mass quantity from original surfaces was much greater than that from pre-ablated surfaces, and the ablation rate (mass per unit area and time) was constant or independe nt of power density below 0.3 GW/cm(2). For pre-ablated surfaces, the mass ablation rate follows exponential behavior in the same power dens ity region. The measured composition of the ablated mass was found to be dependent on the surface condition and laser power density, for bot h original and pre-ablated surfaces. Understanding the influence of la ser energy and surface conditions on mass ablation is essential for ac curate and precise chemical analysis.