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Method for fast determination of oxygen isotope composition of water in beverage wine

A technology for rapid determination of oxygen isotopes, applied in measurement devices, material separation, analysis of materials, etc., can solve the problems of large sample volume, inability to quickly analyze with water, and long-term isotope exchange reaction, and achieve the effect of rapid analysis and simple operation.

Inactive Publication Date: 2015-11-04
CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of method also has two disadvantages: one is that the isotope exchange reaction needs to be carried out for a long time, and the other is that the required sample amount is relatively large (Wang Daobing, Zhong Qiding, Liu Ming, Liu Chuanhe, Huang Zhanbin. Off-line equilibrium method and GC- Determination of δ18O in water by IRMS.2014Vol.35(4):348-354), (Wang Daobing; Zhong Qiding; Gao Hongbo; Cheng Tao; Huang Zhanbin. GasBenchⅡ-IRMS method for the determination of δ18O in wine water. 2014Vol.35(4) :355-361)
The second type of technology is able to complete the water delta in a very short time 18 The analysis of O (within 15min) requires a small amount of sample (about 0.1μL). However, since this technique is not only applicable to the δ 18 O analysis, also applicable to delta of other oxygenated species 18 O determination, so currently this technique is only used for the δ of pure substances 18 O determination or total delta of the mixture 18 O analysis, but cannot be used for rapid analysis of water in beverage wine

Method used

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  • Method for fast determination of oxygen isotope composition of water in beverage wine
  • Method for fast determination of oxygen isotope composition of water in beverage wine
  • Method for fast determination of oxygen isotope composition of water in beverage wine

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Effect test

Embodiment 1

[0034] Precision Analysis

[0035] Taking distilled water, wine and white wine as the experimental objects respectively, according to the specific implementation steps above, continuous measurements were carried out 8 times to verify the precision of the method. The results are shown in Table 1:

[0036]

[0037] Table 1 Precision test results (‰)

[0038] The above data are the results of direct measurements. The results show that this technique has good precision in the determination of pure water, wine and liquor (distilled spirits): the standard deviation is distributed between 0.28 and 0.35‰, which is consistent with the determination of oxygen-containing substances δ by high-temperature transformation 18 O precision requirements.

Embodiment 2

[0040] Verification of accuracy

[0041] For verifying the accuracy of the present invention, take series brandy, white wine and wine as experimental object, measure the δ in its water according to the specific implementation steps of the present invention 18 O (denoted as "calculated value") (in which the international VSMOW is used as the water reference substance), and the method of the International Organization of Vine and Wine (OIV) is used to determine the δ in water. 18 O (denoted as "true value"), the results are shown in Table 2:

[0042] Table 2 δ in beverages 18 O Actual value and calculated data (‰)

[0043]

[0044] As can be seen from Table 2, the inventive method measures the δ in beverage wine 18 The difference between the calculated value of O and the true value of the sample is -0.59‰~0.46‰, which shows that this method is used to determine the δ 18 The accuracy of O is good, and there is a good linear correlation between the real value and the calcul...

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Abstract

The invention relates to a method for fast determination of oxygen isotope composition of water in beverage wine and belongs to the technical field of stable isotope analysis. The method comprises carrying out gas chromatographic column separation on water and other oxygen-containing organic matters in a beverage wine sample, transforming the water into carbon monoxide by a pyrolysis method, determining produced carbon monoxide delta<18>O by a stable isotope ratio mass spectrum, and carrying out calibration by international or national water reference substances to obtain oxygen isotope composition of water in beverage wine, wherein the composition is characterized by delta<18>O.

Description

technical field [0001] The invention relates to a method for quickly determining the composition of oxygen isotopes in drinking wine, which belongs to the technical field of stable isotope analysis, and specifically uses chromatography to separate water and other oxygen-containing compounds, and then analyzes the calculation of the stable oxygen isotope ratio of water by cracking , can be used for the rapid determination of the stable oxygen isotope ratio of water in drinking wine, especially for the analysis of water in distilled wine. Background technique [0002] Water is the most widely distributed substance in nature. Due to stable isotope fractionation, water from different sources 18 O with 16 There are certain differences in the content of O, especially the water from plants. Due to the influence of transpiration, photosynthesis and respiration, the water in the water 18 O with 16 The content of O is very different from groundwater / surface water, so it has importa...

Claims

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Application Information

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IPC IPC(8): G01N30/02
Inventor 钟其顶王道兵
Owner CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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