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Pre-processing method for determination of phosphorus and application

A technology for products and dairy products, applied to the pretreatment of phosphorus determination in dairy products, the pretreatment of phosphorus determination in food, and the field of phosphorus detection in dairy products, can solve the problems of long digestion time, explosion, pollution, etc., and achieve low cost, The effect of high efficiency and high test safety

Inactive Publication Date: 2016-01-20
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

[0003] In actual testing, perchloric acid is heated and decomposed to produce chlorine dioxide, chlorine gas, etc., which pollute the environment. At the same time, the white smoke generated in the later stage of the digestion experiment can easily produce a powerful explosion phenomenon if it encounters organic matter, and the experiment takes a long time to digest

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Operation steps

[0020] a. Weigh 1g of commercially available wheat-flavored milk and 10ml of concentrated nitric acid in a 150ml Erlenmeyer flask, and heat on an electric heating plate;

[0021] b. After the brown smoke is removed, add 3ml of concentrated sulfuric acid for carbonization, and heat until the liquid turns black;

[0022] c. Add 10ml hydrogen peroxide for digestion;

[0023] d. When the digestion solution becomes transparent and white smoke, add 30ml of distilled water, and remove the acid at 100 degrees Celsius;

[0024] e. When the liquid is 3-5ml, transfer to a constant volume, take 10ml and add 10ml of chromogen to develop color, according to the phosphorus determination method in GB5413.22-2010 "Determination of Phosphorus in Infant Food and Dairy Products", at 440nm Measure the absorbance value, determine the phosphorus concentration of the analyte according to the concentration of the standard curve corresponding to the absorbance value, and b...

Embodiment 2

[0028] 1. Operation steps

[0029] a. Weigh 0.5g of commercially available milk powder and 10ml of concentrated nitric acid in a 150ml Erlenmeyer flask, and heat on an electric heating plate;

[0030] b. After the brown smoke is removed, add 3ml of concentrated sulfuric acid for carbonization, and continue heating until the liquid turns black;

[0031] c. After carbonization, add 10ml of hydrogen peroxide, heat and digest, and control the temperature within the range close to boiling or low heat to maintain boiling;

[0032] d. When the digestion solution becomes transparent and white smoke, add 30ml of distilled water, and remove the acid at 100°C;

[0033] e. When the liquid is 3-5ml, transfer to a constant volume, take 10ml and add 10ml of chromogen to develop color, according to the phosphorus determination method in GB5413.22-2010 "Determination of Phosphorus in Infant Food and Dairy Products", at 440nm Measure the absorbance value, determine the phosphorus concentratio...

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Abstract

The invention discloses a pre-processing method for determination of phosphorus. The method comprises steps as follows: performing first-level digestion on a dairy product to obtain a first-level digestion product; carbonizing the first-level digestion product to obtain a carbonization product; adding hydrogen peroxide to perform second-level digestion on the carbonization product to obtain a second-level digestion product. The invention further discloses a method for detecting phosphorus in the dairy product. The methods adopted for performing pre-processing of phosphorus determination and / or determination of phosphorus content of the dairy product have the advantages of safe detection, low environmental pollution, high efficiency and low cost.

Description

technical field [0001] The invention relates to the field of food detection. Specifically, the present invention relates to a pretreatment method and application of phosphorus determination in food. More specifically, the present invention relates to a pretreatment method for determining phosphorus in dairy products and a method for detecting phosphorus in dairy products. Background technique [0002] Nitric acid-perchloric acid digestion is a commonly used pretreatment method for the determination of phosphorus content in milk and dairy products. For example, in the National Food Safety Standard GB5413.22-2010 "Determination of Phosphorus in Foods for Infants and Young Children and Dairy Products", it is recorded that the principle of phosphorus determination is: the sample is oxidized by acid to make phosphorus form yellow color with ammonium vanadium molybdate in nitric acid solution. complexes. Use a spectrophotometer to measure the absorbance at a wavelength of 440nm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/44
Inventor 胡彩霞王佳马文丽宋晓东刘美霞
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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