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- Title
Determination of Heavy Metals in Ambient Air Particulate Matter Using Laser-Induced Breakdown Spectroscopy.
- Authors
Awan, Muhammad; Ahmed, S.; Aslam, M.; Qazi, Ishtiaq; Baig, M.
- Abstract
The study describes optimization of the laser-induced breakdown spectroscopy (LIBS) experimental parameters for the determination of heavy metals in ambient air particulate matter. The optimization was performed using solidified metal standards on filter discs. The optimized values of LIBS parameters were 4.5 μs (delay time), 89.5 mJ (laser pulse energy), and 70 mm (lens to sample surface distance). At these optimized values LIBS demonstrated strong spectrum lines for each metal keeping the background noise at minimum level.The new method of preparing metal standards on filter discs exhibited calibration curves with good linearity over the concentration range 50-500 ppm with correlation coefficients, R in the range of 0.992-0.998. The limit of detection for the three metals was in the range of 29-48 ppm. The developed method was tested on real ambient air samples for determination of cadmium, zinc, and lead. The concentration of various metals determined by the developed LIBS method was verified against a conventional analytical technique, flame atomic absorption spectroscopy.
- Subjects
HEAVY metals; LASER-induced breakdown spectroscopy; PARTICULATE matter; CADMIUM; ZINC; LEAD; ATOMIC absorption spectroscopy
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2013, Vol 38, Issue 7, p1655
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-013-0548-7