Method for detecting residual quantity of bromomethane in grains

CN120468340APending Publication Date: 2025-08-12INSPECTION & QUARANTINE TESTING CENT OF HEBEI ENTRY EXIT INSPECTION & QUARANTINE BUREAU
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Patent Information

Application Number
CN202510731407.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-03
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

In the prior art, the extraction efficiency of methane bromine in grain samples is low, the recovery rate fluctuates greatly, and the pre-treatment steps are cumbersome, making it difficult to accurately detect the residual amount of methane bromine.

Method used

After the grain samples were frozen and ground by liquid nitrogen, the automatic injection and purge capture method was used to enrich methane bromine in the trap tube, and the detection was carried out by gas chromatography mass spectrometer to adjust the purge temperature and time to improve the recovery rate.

Benefits of technology

Improves the volatility and recovery of methane bromine, ensures the accuracy and consistency of the test results, and simplifies the pre-treatment steps.

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Abstract

The invention provides a method for detecting the residual quantity of bromomethane in grains, and belongs to the technical field of food safety detection. The method comprises the following steps: firstly, grinding a grain sample, and performing cryopreservation to obtain a to-be-detected sample; then enriching bromomethane in a trapping tube by adopting an automatic sample injection purge trapping method; carrying out thermal desorption on the trapping pipe; and finally, detecting by using a gas chromatograph-mass spectrometer. According to the method, the grain sample is ground into powder and then cryopreserved, so that the volatilization of bromomethane can be effectively improved, and trapping is facilitated. The recovery rate of methyl bromide is improved by adjusting the purging temperature and the purging time, and the problem that the detection result is low is prevented.
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