Method for efficiently measuring content of Cu, Fe, Mn and Ca in cereal food

Abstract

The invention discloses a method for efficiently measuring the content of Cu, Fe, Mn and Ca in cereal food. The method comprises the following steps: digesting a sample, drawing a standard curve, measuring the sample, weighing 2.000 g of the sample, adding 20 mL of a nitric acid and perchloric acid mixing solution to perform wet digestion, wherein the volume ratio of nitric acid and perchloric acid is 4:1; under the best working condition selected for an instrument, measuring the absorbance of a standard series of solutions, taking the concentrations of elements as an x-coordinate, wherein the absorbance is a y-coordinate, and drawing a standard curve; keeping a favorable linear relation between the mass concentrations of Cu, Fe, Mn and Ca and the absorbance, wherein the mass concentration ranges of Cu, Fe, Mn and Ca are respectively 0.2-2.0 mg / L, 0.5-6.0 mg / L, 0.5-4.0 mg / L, and 2.0-10.0 mg / L, the correlation coefficients r of Cu, Fe, Mn and Ca are 0.9990, 0.9980, 0.9985 and 0.9999. The method has the advantages of being capable of continuously measuring the content of Cu, Fe, Mn and Ca, accurate, fast, stable, simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of testing and analysis, in particular to a method for efficiently measuring the contents of copper, iron, manganese and calcium in cereal foods. Background technique [0002] Cereals play an important role in the diet of our country, and cereals mainly refer to the seeds of gramineous plants. It includes rice, wheat, corn, etc. and other miscellaneous grains, such as corn, millet, black rice, buckwheat, oats, barley, sorghum, etc. The nutrients of grain food are mainly carbohydrates, the main component is starch, the average content of carbohydrates is about 90%, and the digestion and utilization rate is very high; followed by protein, generally 7.5~15.0%, oats and highland barley can reach 15% respectively and 13%, containing about 1.5-5.5% of inorganic salts, with the most content in the husk and aleurone layer. Since cereals are the traditional staple food of the Chinese people, they are still the main ...

AI Technical Summary

Problems solved by technology

Traditional atomic absorption spectrometer equipment mainly uses hollow cathode lamps that emit sharp-line light sources, which have the advantages of high precision, good selectivity, and less interference. However, when analyzing different elements, not only need to replace different hollow cathode lamps, but also need to Re-establish different methods in the workstation to change parameters such as the working current and wavelength of the hollow cathode lamp, which will increase the time required for the entire experimental process, thus affecting the detection efficiency

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