Abstract: Laser-Induced
Breakdown Spectroscopy (LIBS) is a technique that used for quantitative elemental
analysis of various samples in different forms. In this technique, a laser
light is focused on the surface of sample yielding a plasma just above the
sample surface that used for analytical source. Nowadays, rapid powder analysis
in tiny amount (mg) has been carried out using plasma induced by high power
laser of Nd:YAG (Neodymium-doped Yttrium
Aluminium Garnet) at atmospheric pressure. However, powder analysis using high
power laser is still difficult to be carried out due to blow of powder when irradiated laser
beam focused on a powder sample. In general, the powder must be transformed
into pellet form prior to analysis. Pellet sample requires a lot of powder and
it takes time for preparation. In this study, we developed a technique of
powder sample with its size about 30 µm
(± 5 mg) that mixed with silicon grease (± 5 mg) that act as a binder. The
mixed sample then thinly painted on the metal plate as sub-target. The study
showed that by employing sillicon grease
technique, a semiquantitative analysis of several elements contain in
coal, rock, and water can be conducted. Meanwhile heavy metal in
soils is still not able to detect. This results showed that sillicon grease
technique using Nd:YAG laser can be
applied for rapid semi-quantitative analysis of powder samples available only
in tiny amounts.
Keywords: high pressured
plasma, Nd:YAG laser, powder analysis, silicon grease technique
Penulis: Syahrun Nur
Madjid
Kode Jurnal: jpfisikadd120006
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