Digestion method for detecting metal element content of food

Abstract

The invention discloses a digestion method for detecting the metal element content of food. The method comprises the following steps: measuring or weighing a sample of an object to be digested, putting the sample into a digestion container, and placing the digestion container in a high-temperature steam digestion zone of a high-temperature superheated steam digestion device; and in the high-temperature superheated steam digestion device, subjecting the sample in the digestion container to digestion with high-temperature superheated steam, wherein the digestion comprises an exhausting step, a dehydration step, a high-temperature digestion step and a sample cooling step. The digestion treatment method provided by the invention has the advantages of large sample treatment capacity, high carbonization rate of organic matters and the like; in an environment with no oxygen and normal pressure, the metal element of the sample to be detected is not oxidized, large-particle carbon and carbon-particle-wrapped metallic compounds are not produced after carbonization; and little dissolved acid is used in the whole process, so the risk of experimental accidents caused by strong acid and the riskof environmental pollution are avoided.

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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