Laser mass-spectrometer measurement method of trace elements and constant-pressure open-type portable laser mass spectrometer
A trace element, laser mass spectrometry technology, applied in the field of atmospheric pressure open portable laser mass spectrometer, can solve the problems of low signal-to-noise ratio, difficult detection, low content of elements to be measured, etc.
Pending Publication Date: 2018-06-15
CHANGZHOU INNO MACHINING +2
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Problems solved by technology
[0011] The technical problem to be solved by the present invention is: when an open portable laser mass spectrometer at atmospheric pressure measures trace elements in a sample, due to the extremely low content of the elements to be measured, the detection is difficult and the signal-to-noise ratio is low
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[0032] In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.
[0033] In a specific embodiment, a method for measuring trace elements by laser mass spectrometry is disclosed, and the method may specifically include the following steps:
[0034] S1. Determine the resonance frequency of the trace element to be measured in the sample to be tested;
[0035] S2. Select a laser with a specific wavelength corresponding to the resonant frequency obtained according to the obtained resonant frequency;
[0036] S3. Use a laser with a selected specific wavelength to perform radiation measurement and resonantly excite trace elements to be measured. The resonant excitation process is single-photon ionization or multi-photon ionization. Multiple photons can be of the same energy or different energies , the transiti...
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The invention provides a laser mass-spectrometer measurement method of trace elements and a constant-pressure open-type portable laser mass spectrometer and belongs to the field of analysis instruments. According to the scheme, when the mass spectrometer is utilized for measuring the trace elements, since the content of the trace elements is too low, detection is difficult and the signal to noiseratio is pretty low; therefore, according to transition frequencies of target element atoms or ions or molecules, laser with a corresponding wavelength can be selected for resonance excitation, and the ionization rate of elements to be detected is selectively increased, so that target objects can be selectively detected. The signal to noise ratio of an object to be detected is increased, the detectable concentration of the object to be detected is lowered, and the laser mass-spectrometer measurement method of the trace elements and the constant-pressure open-type portable laser mass spectrometer are suitable for special detection.
Description
technical field [0001] The invention relates to the field of analytical instruments, in particular to a laser mass spectrometry measurement method for trace elements and an open-type portable laser mass spectrometer at normal pressure. Background technique [0002] A mass spectrometer is an instrument that analyzes the mass number of ions based on the mass-to-charge ratio of ions. It can identify the content and type of chemical components present in the sample by determining the mass-to-charge ratio and the abundance of gas phase ions. It can be used in the detection of elements and isotopes It plays an irreplaceable role in analysis and analysis. According to market research reports, the global mass spectrometry market achieved an output value of US$4.92 billion in 2015, and will reach a market size of US$7.279 billion in 2020 at a compound annual growth rate of 8.1% in the next five years. North America accounted for the largest share in the global mass spectrometry mark...
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IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 周云申秦国双
Owner CHANGZHOU INNO MACHINING