Method for detecting molybdenum element in milk powder

Abstract

The invention relates to a method for detecting molybdenum element in milk powder. The used equipment is an inductively coupled plasma atomic emission spectrometer. The method has the following steps of: 1) preparing molybdenum element standard solution and making a standard curve according to the standard solution; 2) oxidizing a milk powder sample to be tested by using peroxide, performing acid treatment by using nitric acid, digesting in a microwave digestion system, and detecting by using equipment parameters same as the standard solution to obtain a detection result of the sample to be tested; and 3) comparing the detection result of the sample to be tested with the standard curve to determine the content of the molybdenum element in the sample to be tested. The instrument detection limit of the method is 0.0071 mu g / ml, and in an element linear range, the related coefficient r is over 0.999, and the recovery rate is 92.0 to 101.8 percent. The method can quickly and accurately detect the content of the molybdenum element in the milk powder, and has the advantages of low element loss and pollution probability in the sample preparing process, accurate and reliable result, good repeatability and high sensitivity.

Description

technical field The invention relates to a method for detecting molybdenum element in milk powder, in particular to a method for detecting molybdenum element in milk powder by using an inductively coupled plasma emission spectrometer, and belongs to the technical field of chemical composition detection. Background technique Molybdenum is an essential trace element for human body. The content of molybdenum in the human body is very small, accounting for only one ten-millionth of the body weight. Although the content of molybdenum is very small, it plays an important role that cannot be ignored in human life. It is known that the human heart muscle contains a relatively high proportion of molybdenum, and molybdenum and some enzymes maintain the energy metabolism of the heart muscle. Someone analyzed the hearts of dozens of patients who died of myocardial infarction and found that their molybdenum content was lower than that of healthy people. This shows that the amount of m...

AI Technical Summary

Problems solved by technology

Now, the traditional wet digestion manual method is generally used for detection. First, weigh the sample and add a certain amount of concentrated nitric acid to the beaker overnight, then add perchloric acid to catch the acid on the electric heating plate, and add water many times. During this process, it is easy to burn dry. The final acidity can't be controlled

When acid and water are added during the acid removal process, it is easy to bring other interferences into the sample, and the sample will be turbid if the sampling volume is too large (that is, there is a problem of incomplete digestion)

The traditional wet digestion manual method is not only time-consuming and labor-intensive, pollutes the environment, but also has certain harm to the testing personnel

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