Method for detecting molybdenum element in milk powder

A detection method and milk powder technology, which is applied to the detection of molybdenum in milk powder by ion emission spectrometer, and in the field of detection of molybdenum in milk powder. To achieve the effect of avoiding damage to the instrument and harm to the testing personnel, stable testing, and accurate and reliable results

Active Publication Date: 2010-08-25
INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for detecting molybdenum element in milk powder
  • Method for detecting molybdenum element in milk powder
  • Method for detecting molybdenum element in milk powder

Examples

Experimental program
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Example Embodiment

Example 1

1. Preparation of molybdenum standard solution

Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 5% nitric acid to prepare a 10μg / ml intermediate solution, and then use the intermediate solution to prepare different concentrations of molybdenum Element standard solution. Accurately draw the intermediate solution according to the volume listed in Table 1 and place it in a 50ml volumetric flask. Use 5% nitric acid to accurately dilute to 50ml, that is, the preparation concentration is 0.05μg / ml, 0.1μg / ml, 0.5μg / ml, 1.0μg / ml, 2.0μg / ml molybdenum standard solution.

Table 1 The volume of the intermediate solution required when preparing the standard solution of molybdenum (unit: ml)

2. Preparation of 5% nitric acid

Accurately draw 50ml of concentrated nitric acid (super pure), place it in a beaker with about 100ml of ultrapure water, and tra...

Example Embodiment

Example 2

1. Preparation of molybdenum standard solution

Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 5% nitric acid to prepare a 10μg / ml intermediate solution, and then use the intermediate solution to prepare different concentrations of molybdenum Element standard solution. Accurately pipet the intermediate solution according to the volume listed in Table 6 and place it in a 50ml volumetric flask. Use 5% nitric acid to accurately adjust the volume to 50ml, that is, the preparation concentration is 0.01μg / ml, 0.05μg / ml, 0.1μg / ml, 0.5μg. / ml four different concentrations of molybdenum standard solution.

Table 6 The volume of the intermediate solution required when preparing the standard solution of molybdenum (unit: ml)

2. Preparation of 5% nitric acid

Same as Example 1.

3. Testing equipment

Same as Example 1.

4. Standard solution detectio...

Example Embodiment

Example 3

1. Preparation of molybdenum standard solution

Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 5% nitric acid to prepare a 10μg / ml intermediate solution, and then use the intermediate solution to prepare different concentrations of molybdenum Element standard solution. Accurately draw the intermediate solution according to the volume listed in Table 8 and place it in a 50ml volumetric flask. Use 5% nitric acid to accurately dilute the volume to 50ml, that is, the preparation concentration is 0.01μg / ml, 0.05μg / ml, 0.1μg / ml, 0.3μg / ml, 0.5μg / ml, 1.0μg / ml, 1.5μg / ml, 2.0μg / ml molybdenum standard solutions with eight different concentrations.

Table 8 The volume of the intermediate solution required when preparing the molybdenum standard solution (unit: ml)

2. Preparation of 5% nitric acid

Same as Example 1.

3. Testing equipment

Same as Ex...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/73G01N1/44
Inventor 其其格高娃乌尼尔常建军李梅刘卫星
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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