Method for measuring heavy metals in ink based on partial least squares

Abstract

The invention discloses a method for measuring heavy metals in ink based on partial least squares. The method comprises the following steps: at first, attaching ions in a calibration sample to an adsorbent by using zinc oxide as an adsorbent, then detecting the calibration sample with an unknown content by using an LIBS system, and establishing a PLS regression equation of the calibration sample according to an obtained spectral line intensity matrix; and then detecting a sample to be measured and obtaining an LIBS spectrum, substituting the spectral line intensity matrix of the spectrum into the corresponding PLS regression equation to calculate the mass concentrations of elements in the sample to be measured. According to the method, the effective information of the LIBS spectrum is sufficiently utilized, the multiple correlations of the spectral line intensity caused by mutual interference of the elements are overcome, the impact of a matrix effect is reduced, and compared with the traditional single variable calibration method, the method has the advantages of good goodness of fit, strong repeatability and high prediction accuracy.

Description

technical field [0001] The invention relates to a method for quantitatively analyzing heavy metals in ink by combining laser-induced breakdown spectroscopy (LIBS for short) with partial least squares (PLS). Background technique [0002] In the process of collecting samples of plants, geology, and the environment, and in many fields such as the manufacture of electronic circuit boards, batteries, and semiconductor chips, it is often necessary to use marker pens or inks of different colors to mark or label sample specimens and products. The ink or dye in the marker pen writes or prints on the sample or product, and many of these inks or dyes are metal complex dyes, which contain certain metal ions, and these common metals are copper, chromium and cobalt. If care is not taken, these metal ions will remain or infiltrate into samples or products to cause heavy metal pollution and doping. Therefore, it is of great significance to measure the metal ions in these used marking pen...

AI Technical Summary

Problems solved by technology

However, this technology has great disadvantages when measuring liquid samples, such as sputtering, quenching and short life of plasma, which will affect the measurement, and the obvious matrix effect of this technology also limits the application of this technology in liquids

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