Detection of electrolyte elements in human blood based on laser-induced breakdown spectroscopy

Laser induced breakdown spectroscopy (LIBS) is a rapid and simple detection method with almost no sample preparation. In this paper, LIBS was used to detect the electrolyte elements Na and K in human blood. The liquid drop method and evaporation method were used to improve the LIBS detection capability. The polynomial fitting method and wavelet transform method were proposed to optimize the LIBS spectrum. The results showed that, the signal to background ratio (SBR) of Na Ⅰ 588.99nm spectral line increased by 20.57 times after use the methods, and the SBR of K Ⅰ 766.49nm increased 24.65 times. The intensity of Na Ⅰ 588.99nm spectral line obtained by liquid drop method is 1.05 times higher than evaporation method, and 194.08 times higher than direct detection the human blood through test tube. The intensity of K Ⅰ 766.49nm spectral line obtained by liquid drop method is 2.41 times high than evaporation method. According to the results, LIBS is suitable for the detection of electrolyte elements Na and K in human blood. The polynomial fitting method and wavelet transform method can greatly increase the SBR of Na Ⅰ 588.99nm and K Ⅰ 766.49nm in human blood. The liquid drop method can greatly improve the LIBS detection capability of electrolyte elements Na and K in human blood. Compared with the existing blood electrolyte elements detection methods, liquid drop method is more efficient and easier to operate.

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