BATTERY-POWERED LASER-INDUCED PLASMA SPECTROMETER FOR ELEMENTAL DETERMINATIONS

A battery powered, portable laser-induced breakdown spectrometry instr ument with a low pulse energy laser and a low resolution, non-gated sp ectrometer is evaluated. Improvements in the instrument probe design m ere accomplished through studies of the plasma spatial development, le ns-to-sample distance effects and spatial filtering. The prototype was evaluated on paint, steel, ores, and organic samples. Limits of detec tion ranged from 0.016% for Mn in MST SRM steel to 0.13% for Ca in NIS T SRM organic samples. Acceptable precision (0.4-4.9%) mas obtained fo r steel, ore and organic SRM samples. The poorer precision (4.0-44.1%) obtained for the detection of Pb in paint can be attributed to the he terogeneity of the samples.