Detection of heavy metals in water samples by laser-induced breakdown spectroscopy combined with annular groove graphite flakes

Li FANG (方丽); Nanjing ZHAO (赵南京); Mingjun MA (马明俊); Deshuo MENG (孟德硕); Yao JIA (贾尧); Xingjiu HUANG (黄行九); Wenqing LIU (刘文清); Jianguo LIU (刘建国)

doi:10.1088/2058-6272/aae7dc

Plasma Science and Technology > 2019 > 21(3): 34002-034002. > DOI: 10.1088/2058-6272/aae7dc

Li FANG (方丽), Nanjing ZHAO (赵南京), Mingjun MA (马明俊), Deshuo MENG (孟德硕), Yao JIA (贾尧), Xingjiu HUANG (黄行九), Wenqing LIU (刘文清), Jianguo LIU (刘建国). Detection of heavy metals in water samples by laser-induced breakdown spectroscopy combined with annular groove graphite flakes[J]. Plasma Science and Technology, 2019, 21(3): 34002-034002. DOI: 10.1088/2058-6272/aae7dc

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Detection of heavy metals in water samples by laser-induced breakdown spectroscopy combined with annular groove graphite flakes

¹ Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
² University of Science and Technology of China, Hefei 230026, People’s Republic of China
³ Key Laboratory of Optical Monitoring Technology for Environment, Hefei 230031, People’s Republic of China
⁴ Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (No. 21735005), the Science and Technology Program of Anhui Province (No. 1501041119), the Science and Technology Major Special Program of Anhui Province (No. 15CZZ04125), and National Key Research and Development Plan of China (No. 2016YFD0800902-2).

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Received Date: May 17, 2018

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Abstract

Abstract

The use of laser-induced breakdown spectroscopy (LIBS) for the analysis of heavy metals in water samples is investigated. Some factors such as splashing, surface ripples, extinction of emitted intensity, and a shorter plasma lifetime will influence the results if the water sample is directly measured. In order to avoid these disadvantages and the ‘coffee-ring effect’, hydrophilic graphite flakes with annular grooves were used for the first time to enrich and concentrate heavy metals in water samples before being analyzed by LIBS. The proposed method and procedure have been evaluated to concentrate and analyze cadmium, chromium, copper, nickel, lead, and zinc in a water sample. The correlation coefficients were all above 0.99. The detection limits of 0.029, 0.087, 0.012, 0.083, 0.125, and 0.049 mgl ^-1 for Cd, Cr, Cu, Ni, Pb, and Zn, respectively, were obtained in samples prepared in a laboratory. With this structure, the heavy metals homogeneously distribute in the annular groove and the relative standard deviations are all below 6%. This method is very convenient and suitable for online in situ analysis of heavy metals.
- laser-induced breakdown spectroscopy,
- quantitative analysis,
- heavy metals,
- graphite flake

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References

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Detection of heavy metals in water samples by laser-induced breakdown spectroscopy combined with annular groove graphite flakes