Approaching the ppb detection limits for copper in water using laser induced breakdown spectroscopy

Walid Tawfik; Sausan Sawaf

doi:10.1117/12.2053957

21 May 2014 Approaching the ppb detection limits for copper in water using laser induced breakdown spectroscopy

Walid Tawfik, Sausan Sawaf

Proceedings Volume 9101, Next-Generation Spectroscopic Technologies VII; 91010L (2014) https://doi.org/10.1117/12.2053957
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

Abstract

Copper concentrations in drinking-water is very important to be monitored which can cause cancer if it exceed about 10 mg/liter. In the present work, we have developed a simple, low laser power method to improve the detection limits of laser induced plasma spectroscopy LIBS for copper in aqueous solutions with different concentrations. In this method a medium density fiberboard (MDF) wood have been used as a substrate that absorbs the liquid sample to transform laser liquid interaction to laser solid interaction. Using the fundamental wavelength of Nd:YAG laser, the constructed plasma emissions were monitored for elemental analysis. The signal-to-noise ratio SNR was optimized using low laser fluence of 32 J cm^-2, and detector (CDD camera) gate delay of 0.5 μs. Both the electron temperature and density of the induced plasma were determined using Boltzmann plot and the FWHM of the Cu at 324.7 nm, respectively. The plasma temperature was found to be 1.197 eV, while the plasma density was about 1.66 x 1019 cm^-3. The detection limits for Cu at 324.7 nm is found to be 131 ppb comparable to the results by others using complicated system.

Citation Download Citation

Walid Tawfik and Sausan Sawaf "Approaching the ppb detection limits for copper in water using laser induced breakdown spectroscopy", Proc. SPIE 9101, Next-Generation Spectroscopic Technologies VII, 91010L (21 May 2014); https://doi.org/10.1117/12.2053957

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KEYWORDS

Copper

Laser induced breakdown spectroscopy

Plasma

Water

Liquids

Spectroscopy

Calibration

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