Green and environment-friendly pretreatment method for determining cadmium in grain processed product based on super microwaves

Abstract

The invention discloses a green and environment-friendly pretreatment method for determining cadmium in a grain processed product based on super microwaves. The method comprises the following steps: 1, taking a grain sample; 2, adding a hydrogen peroxide solution into the sample, uniformly mixing, and putting into a super microwave chemical platform; 3, introducing nitrogen into the super microwave chemical platform, and maintaining the pressure; 4, carrying out digestion treatment according to a preset heating program; 5, taking out the sample after the heating program of the super microwave chemical platform is completed and the sample is cooled; 6, carrying out ultrasonic degassing; and 7, transferring the sample in the microwave digestion tank into a volumetric flask, fixing the volume to a scale by using nitric acid, and uniformly mixing to complete the pretreatment. The method has the beneficial effects of environmental friendliness, low reagent cost, low introduced reagent blank, simplicity and convenience in operation and high working efficiency.

Description

technical field [0001] The invention relates to the field of food detection, in particular to a green and environment-friendly pretreatment method for determining cadmium in processed grain products based on super microwave. Background technique [0002] Processed grain products include rice, wheat flour, dried noodles, processed grain products, processed grain milling products, etc. According to the current national standard GB5009.15-2014 "National Food Safety Standard Determination of Cadmium in Food" and GB 5009.268-2016 "National Food Safety Standard Determination of Multi-Elements in Food", the pretreatment methods for the determination of cadmium include pressure tank digestion, There are four kinds of wet digestion method, microwave digestion method, and dry method digestion method. The first three pretreatment methods all use strong acids, such as nitric acid and perchloric acid. The decomposition of strong nitric acid at high temperature and high pressure will pro...

AI Technical Summary

Problems solved by technology

The decomposition of strong nitric acid at high temperature and high pressure will produce nitrogen monoxide, nitrogen dioxide, nitrous oxide, dinitrogen trioxide, dinitrogen tetroxide, and dinitrogen pentoxide exhaust gas, which will not only pollute the environment but also cause harm to operators.

Moreover, the introduced reagent blank is high, and perchloric acid will introduce chloride ions, which will cause matrix interference and affect the measurement results.

However, dry ashing may cause volatilization loss of low-temperature element cadmium

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