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Method for eleminating interference of cyanate radical in boron isotope thermal ionization mass pectrum detecting

A mass spectrometry and isotope technology, applied in the field of boron isotope mass spectrometry, can solve the problem that there is no very effective solution.

Inactive Publication Date: 2005-03-23
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, to eliminate CNO - In the sample preparation process, Hemming et al. took multiple measures to remove organic matter, and Liu et al. used nitrate-free compounds as BO 2 - ion emitters, but these measures have not substantially eliminated CNO - and Cs 2 CNO + The interference of ions on the determination of boron isotopes seems to be helpless in the world at present, and there is no very effective solution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] The boron in the sample is extracted by using a suitable solvent (melting) agent and a boron-specific ion exchange resin, and purified to prepare an aqueous solution containing a certain amount of boron. In positive thermal ionization mass spectrometry, about 100 μg of graphite is coated on a tantalum metal strip that has been heated at 3A in vacuum for 1 hour, then a sample solution containing about 1 μg of boron is added, and finally about 1 μl of a concentration of 1 % high-purity phosphoric acid, after drying with a current of 1A, put it into the ion source of the mass spectrometer. When the vacuum of the ion source meets the requirements, measure the ion peak intensity at the m / e of 309 and 308 by means of peak skipping. In the presence of phosphoric acid, Cs 2 CNO + The ions are completely suppressed, so there are only Cs at m / e 309 and 308 respectively 2 11 BO 2 + and Cs 2 10 BO 2 + Two ion peaks that can be directly calculated 11 B / 10 B ratio.

Embodiment 2

[0015] In negative thermoionization mass spectrometry, a sample solution containing about 0.1 μg of boron is applied to a rhenium metal strip that has been heated at 4A in vacuum for 1 hour, and finally about 1 μl of high-purity phosphoric acid with a concentration of 1% is added, After drying with a current of 1.5A, install the ion source of the mass spectrometer. When the vacuum of the ion source meets the requirements, measure the ion peak intensity at the m / e of 43 and 42 by means of peak skipping. In the presence of phosphoric acid, CNO - The ions are completely suppressed, so at m / e 43 and 42, respectively, only 11 BO 2 - and 10 BO 2 - Two ion peaks that can be directly calculated 11 B / 10 B ratio.

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Abstract

The invention relates to a method for eliminating cyanic acid radical disturbance in boron isotope thermal ionization mass spectrosoopy, which includes following steps: when using thermal ionization mass spectroscopic detection coat, the restraining agent and boron isotope are coated on the sample according to any proportion to carry on boron isotope detection; the method in the invention is to restrain the synthesis of CNO- and Cs2CNO+ion and eliminate the disturbance of CNO- and CS2CNO+ion to boron isotope detection.

Description

technical field [0001] The invention relates to a boron isotope mass spectrometry technology, in particular to a method for eliminating cyanate interference in boron isotope thermal ionization mass spectrometry. Background technique [0002] Natural boron has two stable isotopes, 10 B and 11 B, due to the considerable relative mass difference between them (up to 8.70%), natural boron isotopes will produce large isotope fractionation, and this isotope fractionation will record the information of chemical geological processes to a large extent, so boron isotope It has been widely used in many fields of cosmology, geology, mineralogy and geochemistry. These applications put forward higher requirements for the determination of boron isotopic composition with high precision. There are many methods for the determination of boron isotopic composition, and thermal ionization mass spectrometry is still the most accurate and widely used method for determining boron isotopic composi...

Claims

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Application Information

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IPC IPC(8): G01N23/22G01N23/221H01J49/26
Inventor 肖应凯魏海珍李世珍孙爱德
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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