Laser-induced breakdown detection (LIBD) of aquatic colloids with different laser systems
Laser-induced breakdown detection (LIBD) of aquatic colloids with different laser systems
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DOI：
10.1016/s0927-7757(99)00497-5
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发表时间：
2001-02-15
影响因子：
5.2
通讯作者：
Kim, JI
中科院分区：
文献类型：
--
作者：
Bundschuh, T;Knopp, R;Kim, JI
The Laser-Induced Breakdown Detection (LIBD) is a new, sensitive method for the quantification of aquatic. colloids of lower range nanometer size in very low concentration, which can not be detected by conventional light scattering methods. The method is investigated by two different laser setups: an excimer pumped dye laser system and a Nd-YAG laser system. In this paper these two different setups for the LIBD an described and compared. Polystyrene reference particles with diameter from 1000 nm down to 19 nm are used for the investigation. The experimental data can be described by a model based on binomial statistics. The Nd-YAG laser system leads to a significant technical improvement in colloid measurement and the limit of detection for particle concentration is better than for the excimer-dye laser system. The model calculation on the experimental data results in a minimum detectable particle radius of r(min) = 0.6 +/- 0.3 nm, which is significantly lower than the value of r(min) = 9.8 +/- 2.0 nm found for the excimer-dye laser system. Such an improvement makes LIED an even more powerful analytical tool for the investigation of aquatic colloids in the size range < 50 nm. (C) 2001 Elsevier Science B.V. All rights reserved.
