Qualitative Analysis by Laser-Induced Breakdown in Aqueous Media

A pulsed, focused laser beam is used to induce dielectric breakdown (LIB) in various solid metallic targets and bulk aqueous samples. Emission from the breakdown plasma is investigated using a non time resolved technique with the feasibility of qualitative elemental analysis in mind. The results, whilst supporting the use of LIB for elemental analysis, highlight the complications present with bulk aqueous solutions. The study emphasises the need to discriminate continuum background radiation from elemental lines; pointing toward the need for more involved approaches to improve the sensitivity of LIBS when applied to aqueous solutions