Method for rapidly determining talcum powder in food by microwave digestion-ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry)

An -ICP-OES, microwave digestion technology, applied in the field of chemical analysis and inspection of talc content in food, can solve the problems of cumbersome processing and long time consumption, and achieve the effects of simple operation, short analysis period and wide linear range

Inactive Publication Date: 2020-05-26
杨俊
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, this method is cumbersome and time-consuming, so it needs to be improved

Method used

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Embodiment

[0020] Embodiment: a kind of microwave digestion-ICP-OES method for quick determination of talcum powder in food, the method is based on the following principle: main component is hydrated magnesium silicate Mg in talcum powder 3 [Si 4 o 10 ](OH) 2 , Hydrated magnesium silicate is insoluble in nitric acid, hydrochloric acid, sulfuric acid, and can react with hydrofluoric acid to form a water-soluble magnesium salt. The blank sample is only digested with concentrated nitric acid to obtain other forms of magnesium. The sample to be tested is digested with nitric acid and hydrofluoric acid to dissolve other forms of magnesium in the sample and magnesium in talcum powder at the same time, and then the acid is fixed. Then use the inductively coupled plasma emission spectrometer to measure the magnesium content in the two groups of solutions, and finally subtract the magnesium content of the blank sample from the magnesium content in the sample to be tested to obtain the magnesium...

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PUM

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Abstract

A method for rapidly determining talcum powder in food through microwave digestion-ICP-OES is mainly and technically characterized by comprising the steps that S1, conducting sample microwave treatment, specifically, weighing two parts of food samples, adding concentrated nitric acid and hydrofluoric acid into one part, adding the same amount of concentrated nitric acid into the other part, and conducting microwave digestion on the two parts of food samples, namely, a to-be-detected sample and a blank sample; S2, removing acid and fixing volume: heating to remove acid, cooling, transferring, and washing with ultrapure water to fix the volume to a scale, so as to obtain a to-be-detected solution and a blank solution; S3, preparing a standard solution, namely diluting a nitric acid solutionstep by step to prepare a magnesium standard solution with gradient concentration; S4, drawing a standard curve: detecting a magnesium element intensity response value of each standard solution by adopting an inductively coupled plasma emission spectrometer, and drawing the standard curve; S5, determining sample content: detecting the magnesium element intensity response value of the blank solution of the to-be-detected solution, and calculating the magnesium element content; S6, making result calculation that the talcum powder content in the food sample is equal to (the magnesium element content of the to-be-detected sample-the magnesium element content in the blank sample) * 5.20. The method has the advantages of simple, quick and accurate operation.

Description

technical field [0001] The invention relates to the field of chemical analysis and testing of talcum powder content in food, in particular to a microwave digestion-ICP-OES method for rapidly determining talcum powder in food. Background technique [0002] The main component of talc powder is magnesium silicate containing crystal water, the molecular formula is Mg 3 [Si 4 o 10 ](OH) 2 Long-term intake of large doses of magnesium silicate can easily lead to kidney silicate stones. For patients with renal insufficiency, dizziness, fainting, arrhythmia or mental symptoms, and abnormal fatigue and weakness may occur. [0003] In the "List of Non-edible Substances and Food Additives That May Be Added Illegally and Abuse in Food (Third Batch)" issued by the National Leading Group for the Special Rectification of the Illegal Addition of Non-edible Substances and Abuse of Food Additives, talcum powder is listed as an ingredient in food processing. Easily abused food additives. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/44
CPCG01N1/44G01N21/73
Inventor 杨俊张贵伟陈树娣
Owner 杨俊
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