Method for detecting zinc element in yolk powder

A detection method, egg yolk powder technology, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems affecting the accuracy of the results, the introduction of interference factors, etc., to achieve simple methods, element loss and pollution rate Small size, energy saving and environmental protection effect

Inactive Publication Date: 2010-09-08
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

For element detection, every step can be the cause of the accuracy of the results
Especially when processing samples repeatedly, it is easy to bring in some interference factors

Method used

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  • Method for detecting zinc element in yolk powder
  • Method for detecting zinc element in yolk powder
  • Method for detecting zinc element in yolk powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of hydrochloric acid and agar solution

[0030] (1) Hydrochloric acid with a concentration of 5% by volume

[0031] Accurately extract 50ml concentrated hydrochloric acid (excellent grade pure), place it in a 100ml ultrapure water beaker, and transfer to a 1000ml volumetric flask after cooling, determine the volume with ultrapure level and mix well.

[0032] (2) 3% agar solution

[0033] Accurately weigh 3g of agar powder and place it in a beaker, dissolve it with pure water, determine the volume with a pure level in a 100ml volumetric flask and mix well.

[0034] 2. Preparation of zinc standard solution

[0035] Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 2% hydrochloric acid to prepare an intermediate solution of 10μg / ml, and then use the intermediate solution to prepare different concentrations of zinc Element standard solution. ...

Embodiment 2

[0065] 1. The preparation of the hydrochloric acid with a concentration of 5% by volume and the agar solution with a concentration of 3% is the same as in Example 1.

[0066] 2. Preparation of zinc standard solution

[0067] Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 2% hydrochloric acid to prepare a 10μg / ml intermediate solution, and then use the intermediate solution to prepare different concentrations of zinc Element standard solution. Accurately draw the intermediate solution according to the volume listed in Table 5 and place it in a 50ml volumetric flask, add 5ml of hydrochloric acid with a concentration of 5% by volume, and then add 2ml of agar solution with a concentration of 3%, and dilute to 50ml with 2% hydrochloric acid. Evenly, that is, four standard solutions of zinc with different concentrations of 0.1μg / ml, 0.2μg / ml, 0.3μg / ml, 0.4μ...

Embodiment 3

[0084] 1. The preparation of the hydrochloric acid with a concentration of 5% by volume and the agar solution with a concentration of 3% is the same as in Example 1.

[0085] 2. Preparation of zinc standard solution

[0086] Precisely absorb the element standard stock solution (concentration 1000μg / ml, single standard purchased by the National Standards Service Center), dilute the stock solution with 2% hydrochloric acid to prepare a 10μg / ml intermediate solution, and then use the intermediate solution to prepare different concentrations of zinc Element standard solution. Accurately draw the intermediate solution according to the volume listed in Table 7 and place it in a 50ml volumetric flask, add 5ml of hydrochloric acid with a volume percentage concentration of 5%, and then add 2ml of agar solution with a concentration of 3%, and dilute to 50ml with 2% hydrochloric acid. Uniform, that is, the preparation concentration is 0.3μg / ml, 0.4μg / ml, 0.5μg / ml, 0.60μg / ml, 0.7μg / ml, 0.8μg / ...

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Abstract

The invention relates to a method for detecting a zinc element in yolk powder, which comprises the following steps of: 1) preparing standard zinc solution of which concentration is 0.1 mu g/ml to 1.0 mu g/ml, and making a standard curve according to the standard solution; 2) weighing, heating and drying a yolk powder sample to be detected, dissolving the dried yolk powder sample into a 5 volume percent hydrochloric acid, adding agar solution of which the concentration is 3 percent, well shaking the mixed solution and then performing detection with equipment parameters the same as those in the detection of the standard solution to obtain a detection result of the sample to be detected; and 3) comparing the detection result of the sample to be detected with the standard curve to determine the content of the zinc element in the sample to be detected. Detection equipment used in the method is an atomic absorption spectrophotometer. In the detection method, instrument detection limit is 0.03 mg/kg, and in a linear range, a related coefficient r of the element is over 0.999 and a coefficient of recovery is 95.1 to 100.2 percent. The detection method of the invention has the advantages of simple steps and accurate and reliable result.

Description

Technical field [0001] The invention relates to a method for detecting zinc in egg yolk powder, in particular to a method for detecting zinc in egg yolk powder by using an atomic absorption spectrophotometer, and belongs to the technical field of chemical component detection. Background technique [0002] Zinc is one of the essential trace elements for the human body. Zinc has played an important role in human survival and economic life for a long time, but it has only gradually attracted people's attention in recent years. Trace element researchers found that the human body's demand for zinc is almost as much as that of iron, which is 10 times more than the human body's demand for copper. Zinc has many physiological functions. Zinc deficiency in pregnant women may lead to fetal malformations. Zinc deficiency in children will hinder growth and development. When adults are deficient in zinc, the immune function of the body decreases. Therefore, zinc maintains the growth and develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
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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