Comparative study of Nd:YAG laser-induced breakdown spectroscopy and transversely excited atmospheric CO₂ laser-induced gas plasma spectroscopy on chromated copper arsenate preservative-treated wood

Abstract

Taking advantage of the specific characteristics of a transversely excited atmospheric (TEA) CO(2) laser, a sophisticated technique for the analysis of chromated copper arsenate (CCA) in wood samples has been developed. In this study, a CCA-treated wood sample with a dimension of 20 mm × 20 mm and a thickness of 2 mm was attached in contact to a nickel plate (20 mm × 20 mm × 0.15 mm), which functions as a subtarget. When the TEA CO(2) laser was successively irradiated onto the wood surface, a hole with a diameter of approximately 2.5 mm was produced inside the sample and the laser beam was directly impinged onto the metal subtarget. Strong and stable gas plasma with a very large diameter of approximately 10 mm was induced once the laser beam had directly struck the metal subtarget. This gas plasma then interacted with the fine particles of the sample inside the hole and finally the particles were effectively dissociated and excited in the gas plasma region. By using this technique, high precision and sensitive analysis of CCA-treated wood sample was realized. A linear calibration curve of Cr was successfully made using the CCA-treated wood sample. The detection limits of Cr, Cu, and As were estimated to be approximately 1, 2, and 15 mg/kg, respectively. In the case of standard LIBS using the Nd:YAG laser, the analytical intensities fluctuate and the detection limit was much lower at approximately one-tenth that of TEA CO(2) laser.

Determination of low alloying element concentrations in cast iron by laser induced breakdown spectroscopy based on TEA CO2 laser system

“…Nevertheless, for the analysis of a certain type of samples higher precision and sensitivity were obtained with CO 2 compared to Nd:YAG laser. [13][14][15][16] In the present study, a laboratory LIBS setup was used, in which the infrared pulsed transversely excited atmospheric (TEA) CO 2 laser is applied as the excitation source and time-integrated space-resolved detection scheme is used for the acquisition of emission spectra. The main benefit of this non-gated LIBS system, compared to commonly practiced LIBS, is simplification of the instrumentation and its cost.…”

Identification of Calcium and Magnesium in Medicine Using Plasma Laser Spectroscopy

“…The resulting plasma is captured by a spectrum analyzer in the form of an OMA (optical multichannel analyzer) to obtain an emission spectrum. Compared to other conventional methods, LIBS allows one to perform elemental analysis quickly and without pre-treatment [9][10]. In addition, LIBS systems are much cheaper than other spectrochemical equipment such as ICP and x-ray fluorescence spectroscopy.…”

Trace metal analysis of element on material surface using pulse CO2 laser-induced breakdown spectroscopy applying vaporization technique

“…Namely, long-lifetime and largevolume plasma is generated because of longer wavelength and longer pulse duration, resulting in higher plasma absoprtion [37,38]. We have used the TEA CO 2 laser-induced breakdown spectroscopy (TEA CO 2 LIBS) for many applications including analyses of soils, powders, and softwood as presented here [39,40,41,42].…”