Comparison study of two commercial spectrometers for heavy metal analysis of laser induced breakdown spectroscopy (LIBS)

Abstract

The purpose of this paper is to compare the performance of two spectrometers that are manufactured from the same company. In this work, heavy metals like lead Pb and copper Cu in the KBr matrix were analyzed using the laser induced breakdown spectroscopic technique. A Q-switched Nd:YAG laser with 90 mJ per pulse operating at the fundamental wavelength of 1064 nm and pulse duration of 10 ns was used to generate plasma at the focal region. The important experimental parameters such as the laser energy, integration time, distance between the lens and sample, distance and angle of the optical fiber from the target were optimized. Two spectrometers manufactured by Ocean Optics namely as Maya2000Pro and USB 4000 were employed for anlyzing the spectral lines. The experimental setup and conditions were remained the same for both experiments. The production of spectral lines from each of the interested elements was analyzed and compared with the NIST (National Institute of Standards and Technology) database. The sensitivity, repeatability and limit of detection for each of the systems are discussed in detail.

Keywords

Heavy metal / spectrometer / LIBS / LOD

References

[1] Miziolek A W, Palleschi V, Schechter I. Fundamentals and applications. Laser-induced breakdown spectroscopy (LIBS), 2006, New York: Cambridge University Press

[2] Cremers D A, Radziemski L J, John W. Handbook of laser-induced breakdown spectroscopy, 2006, UK: Wiley

[3] Gratuze B, Blet-Lemarquand M, Barrandon J N. Mass spectrometry with laser sampling: a new tool to characterize archaeological materials. Journal of Radioanalytical and Nuclear Chemistry, 2001, 247(3): 645-656.

[4] Whitehouse A I. Remote analysis and identification of materials using Laser-Induced Breakdown Spectroscopy (LIBS). Applied Photonics, 1999, 71, 5157-5164.

[5] Rusak D A, Castle B C, Smith B W, Winefordner J D. Fundamentals and applications of laser-induced breakdown spectroscopy. Critical Reviews in Analytical Chemistry, 1997, 27(257): 257-290.

[6] Harmon R S, De Lucia F C, Miziolek A W, McNesby K L, Walters R A, French P D. Laser-induced breakdown spectroscopy (LIBS): an emerging field-portable sensor technology for real-time, in-situ geochemical and environmental analysis. Geochemistry: Exploration, Environment, Analysis, 2005, 5(1): 21-28.

[7] Munson C A, Gottfried J L, Lucia F C D, McNesby K L, Miziolek A W. Laser-based detection methods of explosives, 2007, Amsterdam: Elsevier

[8] Harnly J M, Fields R E. Solid-state array detectors for analytical spectrometry. Applied Spectroscopy, 1997, 51(9): 334-351.

[9] Hanley Q S, Earle C W, Pennebaker F M, Madden S P, Denton M B. Charge-transfer devices in analytical instrumentation. Analytical Chemistry, 1996, 68(21): 661-667.

[10] Mohamad S, Vincent D, Mohamed A, Walid T, Hisham I. Comparative study of two new commercial echelle spectrometers equipped with intensified CCD for analysis of laser-induced breakdown spectroscopy. Applied Optics, 2003, 42(30): 6094-6098.

[11] Sansonetti J E, Martin W C. Handbook of basic atomic spectroscopic data, 2005

[12] Ingle J D, Crouch S R. Spectrochemical Analysis, 1988

[13] Yueh F Y, Sharma R C, Singh J P, Zhang H. Evaluation of potential of laser induced breakdown spectroscopy for detection of trace elements in liquid. Journal of the Air and Waste Management Association, 2002, 52(11): 1307-1315.