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
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[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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