Detection of mercury in water by laser-induced breakdown spectroscopy with sample pre-concentration |
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| Authors: | X. Fang and S. R. Ahmad |
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| Affiliation: | (1) Laser Research Laboratory, Physics Department, King Fahd University of Petroleum & Minerals (KFUPM), Box 5047, Dhahran, 31261, Saudi Arabia;(2) Institute of Environmental Science & Engineering, National University of Sciences and Technology (NUST), Tamiz Ud din Road, Rawalpindi, Pakistan;(3) Earth Sciences Department, KFUPM, Dhahran, 31261, Saudi Arabia |
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| Abstract: | A method based on pre-concentration, using electrolysis, has been proposed and used for the improvement of detection sensitivity of mercury ions at ultra-trace level of concentration in an aqueous matrix by laser-induced breakdown spectroscopy (LIBS). The experimental evaluation of this method was carried out on mercury chloride (HgCl2) in triple-distilled water for a concentration range of the element of 0.01–10 mg l−1. A pre-concentration factor of ∼180 was obtained for LIBS detection of mercury emission line at 253.65 nm. The limit of detection (LoD) of ∼0.011 mg l−1 (or ∼11 ppb) for mercury in the water sample was achieved. |
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