Determination of Ag, Cu, Mo and Pb in Soils and Ores by Laser-Induced Breakdown Spectrometryстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 декабря 2015 г.
Аннотация:We report the results of analytical assessment of LIBS detection of silver, copper, lead and molybdenum in certified and natural soils and ores for the purposes of geochemical exploration. Strong matrix effects have been observed in case of molybdenum determination in soils and ores. Intensity of two Mo lines (313.26 nm and 550.65 nm) for ores was larger 3-5 times than for soils. We corrected such sample-to-sample variations by the proper selection of internal standard. There was no evidence of strong matrix effects in case of other elements. As typically happens in atomic emission spectroscopy, linear dynamic range of LIBS determination was narrow (1-100 ppm) for the resonance lines due to self-absorption. Detection limits of Ag, Mo, Cu and Pb were equal to 0.3 ppm, 0.3 ppm, 0.6 ppm and 8 ppm, respectively. Such sensitivity is sufficient to determine molybdenum, copper and lead at the level of their crustal abundance.