| Abstrak/Abstract |
The photoacoustic spectrometer technique has become the
standard in measuring trace samples with the advantages of high sensitivity
(up to ppt order), on-line, real time detection and range of operations that
are close to 108order. This article reports an experiment usingCO2 laser
photoacoustic spectroscopy for ethylene (C2H4) gas detection in the soil
during the rainy season based on variations in depth and sampling location
using a CO2 laser extracted spectrometer. The lowest limit of detection
value (LOD) was obtained at (416 ± 104) p pt. The concentration of
ethylene gas in the soil during the rainy season based on the variations in
soil depth were (0.18 ± 0.04) ppm for a depth of 0 cm (ground level), (0.17
± 0.04) ppm for a depth of 15 cm from the ground, and (0.15 ± 0.03) ppm
for the depth of 30 cm from the ground. Based on the variations of location
of soil, the obtained values were (0.19 ± 0.04) ppm, (0.18 ± 0.04) ppm, and
(0.15 ± 0.03) ppm respectively for locations in the North, Center and South
were taken around the Biology forest of Gadjah Mada University, which is
situated in the western part of the Faculty of Biology and northern section
of the Faculty of Mathematics and Natural Sciences. It was concluded that
the concentration of ethylene gas in the soil during the rainy season was
not significantly affected by depth and location factors |
