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Detection method for micronutrient levels in liquid milk or milk powder

A technology of trace elements and detection methods, applied in biological testing, material inspection products, thermal excitation analysis, etc., can solve the problems of serious interference in the determination of iron elements, inability to guarantee the accuracy of results, cumbersome sample processing methods, etc., to achieve element loss and The effect of small pollution rate, good parallel results, and simple method

Inactive Publication Date: 2008-12-03
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

Taking the flame method as an example, the sample is weighed and then transferred to an electric heating plate for carbonization, then put into a high-temperature furnace for ashing at 490°C for eight hours, and then cooled to room temperature before dissolving in a solvent. The sample processing method is cumbersome and sometimes There will be incomplete graying
In addition, the iron and rust in the combustion head of the flame method instrument seriously interfere with the determination of iron, which cannot guarantee the accuracy of the results

Method used

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  • Detection method for micronutrient levels in liquid milk or milk powder
  • Detection method for micronutrient levels in liquid milk or milk powder
  • Detection method for micronutrient levels in liquid milk or milk powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The drawing of embodiment 1 standard curve

[0043] 1. Preparation of standard solution

[0044] Preparation of standard solutions of calcium, potassium, magnesium, sodium, phosphorus and iron: Accurately draw each element standard stock solution (concentration 1000 μg / ml, single standard purchased by the National Standards Center) according to the volume listed in Table 1, and put it in a 100ml volumetric flask , use 2% hydrochloric acid to accurately dilute to the volume, prepare a mixed standard solution, and mix well.

[0045] Prepare the standard solution of zinc, manganese and copper: first prepare the standard stock solution into an intermediate solution of 10 μg / ml, then draw the intermediate solution according to the volume listed in Table 1, and prepare a mixed standard solution of iron, zinc, manganese and copper .

[0046] Get the final standard series solutions, transfer them to polyethylene bottles, and store them in a refrigerator at 2-6°C in the dark f...

Embodiment 2

[0086] The OPtima5300DV inductively coupled plasma optical emission spectrometer (ICP-OES) produced by the American Perkin-Elmer Company was used to measure trace elements in milk (hereinafter referred to as ICP direct sampling method), and Haiguang GGX698 flame atomic absorption method was used to detect the content of trace elements in milk (hereinafter referred to as referred to as the flame method).

[0087] Detection elements: calcium, potassium, magnesium, sodium, phosphorus, iron, zinc, manganese, copper

[0088] step:

[0089] 1. Instrument preparation:

[0090] (1) Turn on the host and operating software, adjust the instrument to the best state, turn on the argon gas and water cooling cycle, and preheat for four hours.

[0091] (2) Check the water seal, install the hollow cathode lamp, open the operating software and the host, adjust the instrument to the best state, and preheat. After the instrument is preheated, turn on the water-cooling cycle, turn on the acetyl...

Embodiment 3

[0109] Using OPtima5300DV inductively coupled plasma optical emission spectrometer (ICP-OES) from Perkin-Elmer, USA, to measure trace elements in milk powder (hereinafter referred to as ICP direct sampling method) and Haiguang GGX698 flame atomic absorption method to detect trace elements in milk powder (hereinafter referred to as flame Law).

[0110] Detection elements: calcium, potassium, magnesium, sodium, phosphorus, iron, zinc, manganese, copper

[0111] step:

[0112] 1. Instrument preparation:

[0113] (1) Turn on the host and operating software, adjust the instrument to the best state, turn on the argon gas and water cooling cycle, and preheat for four hours.

[0114] (2) Check the water seal, install the hollow cathode lamp, open the operating software and the host, adjust the instrument to the best state, and preheat. After the instrument is warmed up, turn on the water cooling and turn on the acetylene gas.

[0115] 2. Preparation of samples: weigh 2.5000g, 2.5201...

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Abstract

The invention relates to a method for detecting the microelement content of liquid milk or milk powder. The method comprises the steps as follows: firstly, a standard curve is made; secondly, a sample is detected; thirdly, the detected result of the sample is compared with the standard curve, and the content of the microelement in the sample is obtained; and a detection apparatus is an inductive coupling plasma emission spectrometer. Through the diffusion function of cesium chloride, the surface activity of the sample is changed by utilizing triton x-100, and the sample is added to beryllium standard liquid to be compared, and atomized through an instrument atomizing chamber and is quantified by adopting a multi-reaction monitoring mode. The instrument detection limit of the method is 0.024 to 0.21 Mu g / ml, in an element linear range, a correlation coefficient r is above 0.999, and the recovery rate is 86.8 percent to 103.8 percent. The method has the advantages that the content of microelements in the liquid milk and the milk powder can be rapidly and accurately measured by the method, the probability of the element loss and the element pollution in the sample preparation process is low, results are accurate and reliable, the repeatability is good, and the sensitivity is high.

Description

technical field [0001] The invention relates to a method for detecting trace elements in liquid milk or milk powder, in particular to a method for measuring trace elements calcium, potassium, magnesium, sodium, phosphorus, iron, zinc, The invention discloses a direct sample injection detection method for manganese and copper, which belongs to the technical field of chemical composition detection. Background technique [0002] Although the content of trace elements in the human body is not much, they are closely related to human survival and health. Excessive intake, insufficient intake, or lack of them will cause abnormalities in human physiology or diseases to varying degrees. The most prominent function of trace elements is that they are closely related to the vitality of life, and only an amount as small as a match head or less can exert a huge physiological effect. [0003] According to scientific research, so far, there are 18 kinds of essential trace elements that ha...

Claims

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Application Information

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IPC IPC(8): G01N33/84G01N21/73
Inventor 其其格常建军李梅
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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