Determination of chlorine in concrete by laser-induced breakdown spectroscopy in airстатья
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Дата последнего поиска статьи во внешних источниках: 2 мая 2014 г.
Аннотация:The destruction of concrete is often associated with local chloride corrosion. The ability to determine by laserinduced breakdown spectroscopy (LIBS) the level of chlorine in concrete below that resulting in destructive material changes was demonstrated. The intensity of the analytical line Cl I 837.60 nm increased signifi cantly with the use of double-pulse LIBS. The effects of the interpulse delay and the plasma observation time after the second pulse were studied in order to combine the second harmonics of Q-switched Nd:YAG and Nd:YALO lasers (532 nm + 540 nm).The optimal temporal parameters of double-pulse LIBS determination of chlorine were 4.0 and 0.5 μs, respectively. Under these conditions, the detection limit of chlorine was 50 ppm.