期刊
ANALYTICA CHIMICA ACTA
卷 633, 期 1, 页码 38-42出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2008.11.045
关键词
Portable laser-induced breakdown; spectrometry instrument; Traffic pollution; Particulate material; Lead in situ screening; Surface analysis
资金
- Direccion General de Investigacion, Ministerio de Ciencia e Innovacion, Madrid [CTQ2007-60348]
In situ, real time levels of lead in road sediments have been measured using a man-portable laser-induced breakdown spectroscopy analyzer. The instrument consists of a backpack and a probe housing a Q-switched Nd:YAG laser head delivering 50 mJ per pulse at 1064 nm. Plasma emission was collected and transmitted via fiber optic to a compact cross Czerny-Turner spectrometer equipped with a linear CCD array allocated in the backpack together with a personal computer. The limit of detection (LOD) for lead and the precision measured in the laboratory were 190 mu g g(-1) (calculated by the 3 sigma method) and 9% R.S.D. (relative standard deviation), respectively. During the field campaign, averaged Pb concentration in the sediments were ranging from 480 mu g g(-1) to 660 mu g g(-1) depending on the inspected area, i.e. the entrance, the central part and the exit of the tunnel. These results were compared with those obtained with flame-atomic absorption spectrometry (flame-AAS). The relative error, expressed as [100(LIBS result - flame AAS result)/(LIBS result)], was approximately 14%. (C) 2008 Published by Elsevier B.V.
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