JPH07333148A - Analysis method for boron isotopic ratio - Google Patents

Abstract

PURPOSE:To quicken the analysis of a boron isotopic ratio and automate the analysis by obtaining the concentration of <10>BO2 and <11>BO2 using the isotopic shift of a spectrum due to a difference in mass number after introducing boron water to a chemical frame for transformation into BO. and, then, finding a boron isotopic ratio on the basis of a concentration ratio available therefrom. CONSTITUTION:Sample water (baron water) 1 is introduced to a /chemical frame 2 and transformed into BO2 for light transmission. The emitted light is converged through a condenser lens 3, and spectrally diffracted through a multi-channel analyzer 4. The diffracted light, after amplified through an amplifier 5, is processed with a data processing device 6, and the concentration of <10>BO2 and <11>BO2 is obtained, using the isotopic shift of a spectrum due to a difference in mass number. Thereafter, a boron isotopic ratio is obtained on the basis of a concentration ratio available therefrom. As a result, the analysis of the boron isotopic ratio can be quickened and automated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for analyzing a boron isotope ratio, and is particularly used for rapidly measuring the isotope ratio of boron contained in water.

[0002]

2. Description of the Related Art The total concentration of boron can be easily measured by ICP emission spectrometry or the like, but the isotope shift of the spectrum of the boron atom is small and it is practically impossible to measure the isotope ratio. Therefore, conventionally, it was isolated in the form of boric acid,
The isotope ratio was measured with a mass spectrometer.

[0003]

However, although the method using the mass spectrometer is reliable, it has drawbacks that the analysis takes too much time and the automation of measurement is difficult. Therefore, there is a need for an analytical method that can be quantified quickly and that can be automatically measured.

The present invention has been made in view of these circumstances, and it is an object of the present invention to provide a method for analyzing a boron isotope ratio, which enables rapid analysis of the boron isotope ratio and is capable of automatic analysis, as compared with the prior art. To aim.

[0005]

It is well known that the isotope shift of the molecular vibration spectrum is generally larger than the isotope shift of the atomic spectrum. Therefore, it is possible to measure the isotope ratio of boron by converting boron existing in the form of boric acid into a molecule having a well-known vibrational spectrum and measuring the isotope shift of the molecular spectrum.

As a result of detailed examination of various molecular morphologies, the introduction of an aqueous solution of boric acid into a chemical frame used for atomic absorption spectrometry has a well-known molecular spectrum B.
It became O _{2 and} was found to be suitable for this purpose. BO ₂
It is known that there is an isotope shift in the vibration modes called day ν ₂ and ν _3, and if the spectrum of this vibration mode is measured and the concentration ratio is determined, that is the boron isotope ratio.

The present invention relates to a method for analyzing a boron isotope ratio for measuring the isotope ratio of boron existing in the form of boric acid in water, by introducing boric acid water into a chemical frame to produce BO ₂
After conversion into, the concentration of ¹⁰ BO ₂ and ¹¹ BO _{2 in} the emission spectra of ¹⁰ BO ₂ and ¹¹ BO ₂ was determined by using the isotope shift of the spectrum due to the difference in mass number, and the concentration ratio of boron A method for analyzing a boron isotope ratio, which is characterized by obtaining an isotope ratio.

[0008]

Although there are several possible methods of introducing the boric acid aqueous solution into the chemical flame, the method of introducing it with a nebulizer is the simplest, as is done by flame atomic absorption spectrometry. The boric acid introduced changes its chemical form to the relatively stable BO ₂ . The difference in the wavelengths of the spectra due to the isotopes is ρ = ω ( ¹⁰ BO ₂ ) / ω ( ¹¹ BO ₂ ) = 1.0363. The A ← X absorption of BO ₂ is 396.5-645.0.
Although it is in the range of nm, it has a narrow fine structure (vibration rotation structure). Among them, the corresponding ¹⁰ BO ₂ and ¹¹ BO ₂ spectra may be selected. Figure 2 shows an example of this.
The figure of the spectrum photograph of 0-0 and a 1-1 band of ₂ ( ^{2)-( 2)} transition of BO2 is shown. With this level, it is possible to simultaneously measure using a multi-channel analyzer using a CCD, and the isotope ratio of boron can be easily obtained by obtaining the concentration ratio.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. FIG. 1 shows an outline of an analysis system according to the present invention. First, the sample water (boric acid water) 1 is introduced into the chemical flame ₂ and changed into BO ₂ . This BO ₂ is excited in the frame 2 and emits light. Subsequently, the emitted light is condensed by the condenser lens 3 and dispersed by the multi-channel analyzer 4. Subsequently, the signal amplified by the signal amplifier 5 is processed by the data processing device 6 to obtain ¹⁰ BO ₂ and ¹¹ BO.
Calculate the concentration ratio of ₂ .

As described above, in the above embodiment, 1 boric acid water is used.
Is introduced into the chemical frame 2 and converted into BO ₂ , then ¹⁰ B
In the emission spectra of O ₂ and ¹¹ BO ₂ , the isotope shift of the spectrum caused by the difference in mass number was used to obtain ¹⁰ B
Since the concentrations of O ₂ and ¹¹ BO ₂ are obtained and the isotope ratio of boron is obtained based on the concentration ratio, the boron isotope ratio can be analyzed more quickly and automatic analysis can be realized, as compared with the conventional method.

In the above embodiment, the case where the emission spectrum is used has been described, but in this case, the device configuration is the simplest. However, in order to measure the molecular spectrum, it is naturally possible to use the absorption spectrum and the fluorescence spectrum instead of the emission spectrum.

[0012]

As described above in detail, according to the present invention,
Compared with the conventional method, the analysis of boron isotope ratio can be performed more quickly,
It is also possible to provide a highly reliable boron isotope ratio analysis method capable of automatic analysis.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an analysis system according to a method for analyzing a boron isotope ratio of the present invention.

FIG. 2 is a diagram showing a spectral photograph of BO ₂ .

[Explanation of Codes] 1 ... Sample water, 2 ... frame, 3 ...
Condensing lens, 4 ... Multi-channel analyzer,
5 ... Amplifier, 6 ... Data processing device.

Claims (1)

[Claims] 1. A method for analyzing a boron isotope ratio for measuring the isotope ratio of boron existing in the form of boric acid in water, wherein boric acid water is introduced into a chemical frame to be converted into BO ₂ , and then ¹⁰ BO is converted. in the emission spectrum of ₂ and ¹¹ BO _2, determine the concentration of ¹⁰ BO ₂ and ¹¹ BO ₂ by using the isotope shift of the spectrum due to the difference in the mass number, the determination of the isotope ratio of boron with concentration ratio Characteristic method for analyzing boron isotope ratio.