Preparation method of I-131 standard powdered milk sample

Abstract

The disclosure belongs to the field of food detection, and relates to a preparation method of a I-131 standard powdered milk sample. The method comprises the following steps: a, preparation of an I-131 solution: adding I-131 into a HNO3 solution; b, drying and equipartition of powdered milk: drying a required amount of powdered milk to a constant weight, and equally partitioning the powdered milkinto sample boxes; c, adding of the I-131 solution: uniformly adding the I-131 solution prepared in the step a into the powdered milk sample prepared in the step b; d, drying: drying the powdered milksample of the I-131 solution added in the step c; e, smashing: grinding the sample dried in the step d till hard solid particles disappear; f, mixing: adding the sample ground in the step e into a three-dimensional mixing machine for mixing; g, split charging: uniformly charging the sample mixed in the step f into the sample boxes uniformly; h, checking of the uniformity: sampling the sample in the step g, and checking the uniformity; and i, storage: storing the I-131 standard sample qualified in the step h at a dark place. The I-131 standard powdered milk prepared by the invention has the advantages of no volatilization and high stability.

Description

Technical field

[0001] The present disclosure belongs to the field of food testing, and particularly relates to a method for preparing an I-131 standard milk powder sample. Background technique

[0002] The analysis and measurement of I-131 in milk powder has always been one of the main nuclides monitored by the National Food Radiological Inspection Agency. The milk powder I-131 standard sample is the main link in the analysis of milk powder sample I-131, which is mainly used to check the stability of the instrument, the efficiency of the instrument I-131, and the recovery rate of the analytical method. It is the main reference material for the accurate analysis of the milk powder I-131 . At present, due to the volatility of I-131, AgNO needs to be used in alkaline solutions or in acidic and neutral solutions 3 It can exist as a stabilizer, but the alkali reacts with the protein in the milk powder to form a colloidal solid, which cannot be prepared into a standard sample; curren...

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