Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy（LIBS）. A pulsed neodymium-doped yttrium aluminum garnet（Nd：YAG） laser（1,064 nm, 8 ns, 200 mJ） was focused onto ...Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy（LIBS）. A pulsed neodymium-doped yttrium aluminum garnet（Nd：YAG） laser（1,064 nm, 8 ns, 200 mJ） was focused onto pelletized soil samples. Emission spectra were obtained from oil-contaminated soil and clean soil. The contaminated soil had almost the same spectrum profile as the clean soil and contained the same major and minor elements. However, a C–H molecular band was clearly detected in the oil-contaminated soil, while no C–H band was detected in the clean soil. Linear calibration curve of the C–H molecular band was successfully made by using a soil sample containing various concentrations of oil. The limit of detection of the C–H band in the soil sample was 0.001 mL/g. Furthermore, the emission spectrum of the contaminated soil clearly displayed titanium（Ti） lines, which were not detected in the clean soil. The existence of the C–H band and Ti lines in oil-contaminated soil can be used to clearly distinguish contaminated soil from clean soil. For comparison, the emission spectra of contaminated and clean soil were also obtained using scanning electron microscope-energy dispersive X-ray（SEM/EDX） spectroscopy,showing that the spectra obtained using LIBS are much better than using SEM/EDX, as indicated by the signal to noise ratio（S/N ratio）.展开更多
In this article, a laboratory-built experimental system-laser-induced breakdown spec-troscopy （LIBS）, is used to measure soil samples. It explores landslides band soil of five typical land-slides in Xiangxi （香溪）...In this article, a laboratory-built experimental system-laser-induced breakdown spec-troscopy （LIBS）, is used to measure soil samples. It explores landslides band soil of five typical land-slides in Xiangxi （香溪） River Section of the Three Gorges Reservoir area, which include Bazimen （八字门） landslide, Baijiabao （白家堡） landslide, Jiajiadian （贾家店） landslide, Sixiangxi （泗乡溪）landslide and an unnamed landslide that has already slipped. Soil samples of the five landslides are taken in dif-ferent latitudes, and in relatively consistent altitude. Through experimental measurement, the authors get spectrum of those soil samples, and then do qualitative and quantitative analyses of elements （Mg, Si, K, Al, etc.） in them. The authors conclude that main metal elements in the soil change according to different longitudes and latitudes, which opens up a new way of thinking for the quantitative analysis of the function of soil and water, and for the establishment of relations between chemical environment factors and soil engineering mechanics effects.展开更多
基金financially supported by Diponegoro University,Semarang,Indonesia (31419/UN7.5.1/PG/2015 and 573-18/UN7.5.1/PG/2016)
文摘Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy（LIBS）. A pulsed neodymium-doped yttrium aluminum garnet（Nd：YAG） laser（1,064 nm, 8 ns, 200 mJ） was focused onto pelletized soil samples. Emission spectra were obtained from oil-contaminated soil and clean soil. The contaminated soil had almost the same spectrum profile as the clean soil and contained the same major and minor elements. However, a C–H molecular band was clearly detected in the oil-contaminated soil, while no C–H band was detected in the clean soil. Linear calibration curve of the C–H molecular band was successfully made by using a soil sample containing various concentrations of oil. The limit of detection of the C–H band in the soil sample was 0.001 mL/g. Furthermore, the emission spectrum of the contaminated soil clearly displayed titanium（Ti） lines, which were not detected in the clean soil. The existence of the C–H band and Ti lines in oil-contaminated soil can be used to clearly distinguish contaminated soil from clean soil. For comparison, the emission spectra of contaminated and clean soil were also obtained using scanning electron microscope-energy dispersive X-ray（SEM/EDX） spectroscopy,showing that the spectra obtained using LIBS are much better than using SEM/EDX, as indicated by the signal to noise ratio（S/N ratio）.
基金supported by the National Natural Science Foundation of China (No. 50846041)the Three Gorges Research Center for Geo-hazard, Ministry of Education (No.TGRC201019)the Youth Foundation of South-Central University for Nationalities (No. yzq10006)
文摘In this article, a laboratory-built experimental system-laser-induced breakdown spec-troscopy （LIBS）, is used to measure soil samples. It explores landslides band soil of five typical land-slides in Xiangxi （香溪） River Section of the Three Gorges Reservoir area, which include Bazimen （八字门） landslide, Baijiabao （白家堡） landslide, Jiajiadian （贾家店） landslide, Sixiangxi （泗乡溪）landslide and an unnamed landslide that has already slipped. Soil samples of the five landslides are taken in dif-ferent latitudes, and in relatively consistent altitude. Through experimental measurement, the authors get spectrum of those soil samples, and then do qualitative and quantitative analyses of elements （Mg, Si, K, Al, etc.） in them. The authors conclude that main metal elements in the soil change according to different longitudes and latitudes, which opens up a new way of thinking for the quantitative analysis of the function of soil and water, and for the establishment of relations between chemical environment factors and soil engineering mechanics effects.
