Method for automatically and quickly digesting food sample

Abstract

The invention discloses a method for automatically and quickly digesting a food sample, and belongs to the technical field of physical and chemical inspection of food hygiene. According to the invention, a full-automatic graphite digestion instrument is adopted for digesting the food sample, a matched cover needs to cover a digestion tube in the digestion process, and 1 / 4-1 / 2 of the bottom of a digestion tube body is located in a graphite hole to be heated. The method overcomes defects of the existing food sample digestion methods, such as long time, easiness in pollution, inapplicability to determination of volatile elements such as arsenic, mercury, tin, selenium and the like of dry digestion, high consumption of acid, multiple types of acid, long digestion time, high blank value, high possibility of polluting the environment, inapplicability to determination of mercury and the like of wet digestion, and the risk of high-pressure tube explosion, small digestion sample amount, high labor intensity of tank screwing and cleaning and the like of microwave digestion.

Description

technical field [0001] The invention relates to a method for automatically and quickly digesting food samples, belonging to the technical field of food hygiene physical and chemical testing. Background technique [0002] Analysis and determination of elements in food, sample pretreatment is an important link. At present, the pretreatment method of the GB5009 series of "Food Sanitation Inspection Methods (Physical and Chemical Parts)" for the determination of elements in samples is mainly digestion treatment. Converted into easily decomposed inorganic compounds, so as to obtain a clear, transparent and concentrated solution without precipitation for detection and analysis. The digestion methods mainly include dry digestion, wet digestion, microwave digestion, etc., each of which has its own advantages and disadvantages: dry digestion The advantage is that no or less chemical reagents are used, and the operation is simple. The disadvantage is that the digestion time is long, ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned problems, the present invention uses a fully automatic graphite digestion instrument, adopts the digestion tube to cover and reflow, and the bottom 1 / 4 to 1 / 2 of the digestion tube is located in the graphite hole to heat and digest, and develops a new automatic rapid digestion method. Realize automatic digestion, short digestion time, less reagent types and dosage, less environmental pollution, suitable for determination of various elements in food (including volatile mercury elements), overcome the shortcomings of current food sample digestion methods, such as dry digestion Disadvantages such as long time, easy pollution, not suitable for the determination of volatile elements such as arsenic, mercury, tin, selenium, etc.; wet digestion (automatic graphite digestion method) uses a large amount of acid, many types of acid, long digestion time, blank Disadvantages such as large value, easy to pollute the environment, and unsuitable for determination of mercury elements; the risk of high-pressure explosion tubes in microwave digestion, the small amount of digested samples, and the labor intensity of screwing and cleaning tanks, etc.

Images