A digestion processing method for detection of metal element content in food

Abstract

The invention discloses a digestion processing method for detecting the content of metal elements in food. The method comprises: measuring or weighing samples of objects to be digested into a digestion container, and putting the digestion container into high-temperature superheated steam digestion equipment high-temperature steam digestion zone; in the high-temperature superheated steam digestion equipment, high-temperature superheated steam is used to digest the samples in the digestion vessel, wherein the digestion process includes: exhaust step, dehydration step, high-temperature digestion steps and sample cooling steps. The digestion treatment method provided by the present invention has the advantages of a large amount of processed samples and a fast carbonization speed of organic matter, and in an oxygen-free, normal-pressure environment, the metal elements of the tested sample will not be oxidized, and no carbonization will occur after carbonization. Large-grained carbon does not produce carbon particles to wrap metal compounds, and the amount of soluble acid used in the whole process is extremely low, which will not cause the risk of experimental accidents caused by strong acids, and will not cause environmental pollution risks.

Description

technical field [0001] The invention relates to the field of food detection, in particular to a digestion treatment method for detecting the content of metal elements in food. Background technique [0002] At present, the chemical composition of food is very complex. It contains not only macromolecular organic chemicals such as protein, sugar, fat, vitamins, and organic pesticides introduced due to pollution, but also various inorganic elements such as potassium, calcium, and iron. It often exists in the form of complex binding or complexation through various forces. When a certain method is used to measure the content of a certain component, the existence of other components often brings interference to the user. In order to ensure the smooth progress of the analysis and obtain accurate results, the measured components must be separated, and at the same time Eliminate interference. In addition, some measured components and their traces, such as pollutants, pesticides, toxi...

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Problems solved by technology

[0004] The traditional pretreatment methods for the detection of metal element content in food adopt four methods: wet digestion, microwave digestion, pressure tank digestion, and dry ashing. 0.500mL ~ 10.00mL, accurate weighing requirements to 0.001g equipment requirements are strict, and the error is difficult to control; and the traditional digestion method uses strong acid digestion, strong acid is likely to cause experimental accidents and environmental pollution; in addition, the traditional digestion time generally takes 4 to 8 Hours or even longer, the test efficiency is low; moreover, after traditional digestion and ashing, the insoluble metal oxides produced need to be dissolved with strong acid, and the solution needs to be washed out with acid, so the risk of experimental accidents and environmental pollution is very high; Therefore, it is necessary to provide a new digestion method

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