Method for quantitative analysis of elements in unknown sample by spectrum combined with mass spectrometry

Abstract

The present invention discloses a method for quantitative analysis of elements in an unknown sample by spectrum combined with mass spectrometry. Laser-induced breakdown spectroscopy is combined with secondary extraction field time-of-flight (TOF) mass spectrometry for quantitative analysis, and quantitative analysis for high-detection-sensitivity, real-time, fast, high-precision, non-contact simultaneous detection of multiple elements in one sample can be realized without sample pretreatment. Dual wavelength laser in the method helps to ionize photofragments and molecular clusters again, improves mass signal stability, and enhances laser plasma emission spectroscopy signals; a secondary extraction field in the method helps to improve TOF mass spectrometry resolution and optimize signals. The time-of-flight (TOF) mass spectrometry in the method can be used to quickly determine the elements in the unknown sample to save analysis time and realize real-time quantitative analysis, and also can correct influence of matrix effect and surface morphology on quantitative spectrometric analysis, dark state species which cannot be detected by emission spectra can be detected, and the accuracy of the quantitative analysis can be improved.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a method for quantitatively analyzing elements in unknown samples using spectrum combined with mass spectrometry. Background technique [0002] In 1960, American scientist Maiman invented the first ruby ​​laser, and then scientists invented the method of laser plasma generation. In 1962, in the 10th International Symposium on Spectroscopy, Fred Brech first proposed the use of ruby ​​maser to induce The spectrochemical method of plasmas, which is also the predecessor of laser-induced breakdown spectroscopy. In 1963, scientists had begun to use laser ablation plasma to analyze the surface of materials. However, due to the limitations of laser and spectral acquisition systems at that time, it was difficult to collect spectral signals and the quality was poor. Scientists once lost interest in this method. However, with the development of laser technology, the generation of high-po...

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Problems solved by technology

[0017] The commonly used method to correct the matrix effect is to use the reference signal to normalize the detected signal. However, it is difficult to find the reference element during the online in situ analysis of the measured sample.

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