Laser-based solution ablation injection analysis method

An analytical method and technology for solution samples, applied in the field of chemical analysis, can solve the problems of plasma mass spectrometry, non-mass spectrometry, interference, etc., and achieve the effects of reducing polyatomic ion interference, less consumption, and weakening matrix effects

Active Publication Date: 2019-03-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In addition, the method of membrane desolvation and sample injection cannot solve the problem of non-mass spectral interference in plasma mass spectrometry

Method used

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  • Laser-based solution ablation injection analysis method
  • Laser-based solution ablation injection analysis method
  • Laser-based solution ablation injection analysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]Weigh 50 ± 0.2 mg of basalt (BCR-2) powder sample, and use the ammonium bifluoride method for digestion to obtain the digestion product. Add 1 mL of 1 μg mL to the digestion product -1 Indium (In) single standard solution;

[0050] Digest the product with 2% (v / v) HNO 3 Set the volume to 5.00g to obtain a solution sample;

[0051] Open a hole with a diameter of φ2mm in the solution sample target, and then pipette about 15 μL of the solution sample into the hole until the liquid level is flush with the notch of the hole;

[0052] use The "M" sealing film seals the hole of the built-in solution sample and puts it into the denudation pool;

[0053] Focus under the microscope until the texture of the surface of the parafilm is clear, then use the laser beam to pre-ablate the parafilm until the liquid surface of the solution sample is exposed, and then use the laser beam to ablate the solution sample in the solution sample target to obtain an aerosol. When ablation of the...

Embodiment 2

[0055] Weigh 50±0.2mg of andesite (AGV-2) powder sample, and digest it with ammonium bifluoride method to obtain the digestion product, add 1mL of -1 Indium (In) single standard solution;

[0056] Digest the product with 2% (v / v) HNO 3 Set the volume to 4.00g to obtain a solution sample;

[0057] Open a hole with a diameter of φ2mm in the solution sample target, and then pipette about 15 μL of the solution sample into the hole until the liquid level is flush with the notch of the hole;

[0058] use The "M" sealing film seals the hole of the built-in solution sample and puts it into the denudation pool;

[0059] Focus under the microscope until the texture of the surface of the parafilm is clear, then use the laser beam to pre-ablate the parafilm until the liquid surface of the solution sample is exposed, and then use the laser beam to ablate the solution sample in the solution sample target to obtain an aerosol. When ablation of the solution sample The beam spot diameter ...

Embodiment 3

[0061] Weigh 50 ± 0.2 mg of rhyolite (RGM-2) powder sample, and use the ammonium bifluoride method for digestion to obtain the digestion product, add 1 mL of 1 μg mL to the digestion product -1 Indium (In) single standard solution;

[0062] Digest the product with 2% (v / v) HNO 3 Dilute to 1.00g to obtain a solution sample;

[0063] Open a hole with a diameter of φ2mm in the solution sample target, and then pipette about 15 μL of the solution sample into the hole until the liquid level is flush with the notch of the hole;

[0064] use The "M" sealing film seals the hole of the built-in solution sample and puts it into the denudation pool;

[0065] Focus under the microscope until the texture of the surface of the parafilm is clear, then use the laser beam to pre-ablate the parafilm until the liquid surface of the solution sample is exposed, and then use the laser beam to ablate the solution sample in the solution sample target to obtain an aerosol. When ablation of the solu...

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Abstract

The invention provides a laser-based solution ablation injection analysis method. The method comprises the steps as follows: weighing a to-be-tested geological sample and digesting to obtain a digestion product; subjecting the digestion product to constant volume to obtain a solution sample; injecting the solution sample into a solution sample target; covering the upper part of the solution sampletarget with a sealing film, and then placing the sealed solution sample target in an ablation pool; ablating the solution sample in the solution sample target by adopting a laser beam to obtain aerosol; and loading the aerosol into an inductively coupled plasma mass spectrometer by utilizing a carrier gas for detection, thereby obtaining measured values of major elements and trace elements in theto-be-tested geological sample. By adopting the method provided by the invention, the problems of solvent-related polyatomic ion interference and sample matrix effect in the ICP-MS (Inductively Coupled Plasma Mass Spectrometer) analysis of major elements and trace elements injected by adopting a conventional solution atomization method are overcome, and a simple, environmentally-friendly and novel injection method with a film-dissolving effect is provided for analyzing solution samples by the ICP-MS.

Description

technical field [0001] The invention relates to the technical field of chemical analysis, in particular to a laser-based solution ablation sample introduction analysis method. Background technique [0002] ICP-MS (Inductively Coupled Plasma Mass Spectrometry, Inductively Coupled Plasma Mass Spectrometry) has been widely used in the analysis of major and trace elements in various types of samples. Mass spectral interference and non-mass spectral interference are the two most important factors affecting the quality of ICP-MS data analysis. Mass spectrum interference comes from isotopes or polyatomic ions that have the same mass-to-charge ratio as the analyte. Non-mass spectrum interference is often called matrix effect. It is affected by the chemical composition and content of the sample. A large number of dilution methods are usually used to reduce the influence of matrix effect. Generally, the dilution factor is required to be greater than 2000 in the analysis of geological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/44
CPCG01N1/44G01N27/62H01J49/0409H01J49/0431H01J49/0463
Inventor 胡兆初廖秀红罗涛张文陈力飞刘勇胜
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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