Detection of Cd in table salt by LIBS technology

CHEN Liang; YOU Libing; LUO Xianfeng; YIN Guangyue; FANG Xiaodong

doi:10.7510/jgjs.issn.1001-3806.2019.01.002

LASER TECHNOLOGY > 2019 > 43(1): 6-10. > DOI: 10.7510/jgjs.issn.1001-3806.2019.01.002

CHEN Liang, YOU Libing, LUO Xianfeng, YIN Guangyue, FANG Xiaodong. Detection of Cd in table salt by LIBS technology[J]. LASER TECHNOLOGY, 2019, 43(1): 6-10. DOI: 10.7510/jgjs.issn.1001-3806.2019.01.002

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Detection of Cd in table salt by LIBS technology

1.
Anhui Province Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences, Hefei 230031, China
2.
School of Science Island, University of Science and Technology of China, Hefei 230026, China
3.
Intelligent Manufacturing Institute, Hefei University of Technology, Hefei 230009, China

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Received Date: March 07, 2018
Revised Date: March 25, 2018
Published Date: January 24, 2019

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Abstract

Abstract

In order to realize the rapid quantitative detection of heavy metal cadmium (Cd) in table salt, 8 groups of salt samples were made by adding heavy metal element Cd and the self-made 193nm excimer laser was used as excitation source. By choosing Cd Ⅰ 228.8nm characteristic spectrum line as analysis line, laser induced breakdown spectroscopy (LIBS) technology was used in theoretical analysis and experimental verification. The experiment results show that, when the delay time is 1.5μs, the better spectral intensity and signal-to-background ratio can be obtained. The spectral line strength has a good linear relationship with mass fraction of Cd. The fitting degree is 0.984, the predicted relative error is less than 7%, and the detection limit is 0.65mg/kg. LIBS detection technology not only has the fast and convenient advantages without the need of tedious sample preparation, but also has high detection precision. It is a very novel and potential detection technology in the field of rapid detection of food safety.
- spectroscopy,
- rapid detection,
- laser-induced breakdown spectroscopy,
- table salt,
- cadmium

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