Ashing method and detection method using the same

A detection method and ashing technology, which is applied in the preparation of test samples, color/spectral characteristic measurement, thermal excitation analysis, etc., can solve the problem of long process time, and achieve easy operation, improved work efficiency, energy and environmental protection Effect

Inactive Publication Date: 2013-12-04
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

However, repeated high-temperature burning is still required, and the process still takes a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0017] 1. Ashing the milk sample:

[0018] Take the milk sample to be tested, weigh 15.0123g and 15.0600g respectively, and carry out the following treatment: put the sample in a porcelain crucible, place it on an electric heating plate at 45°C and carbonize until no smoke occurs; take it out and cool it to room temperature, and add the volume fraction of 3mL of 65% concentrated nitric acid was evaporated to dryness; transferred to a muffle furnace and burned at 490°C for about 5 hours, cooled to room temperature, taken out, added 5mL of hydrochloric acid solution with a volume fraction of 20%, transferred to a 50mL volumetric flask, and made to volume with water .

[0019] 2. Detect the content of various elements in the milk sample after ashing.

[0020] 1) Accurately absorb element standard stock solutions (concentration 1000 μg / mL, single standard purchased by the National Standards Center), respectively prepare calcium, potassium, sodium, and iron stock solutions with 2%...

no. 2 example

[0034] 1. Ashing the milk powder sample:

[0035] Take the milk powder sample to be tested, weigh 4.9927g and 4.9864g respectively in a porcelain crucible, place it on a heating plate at 50°C and carbonize it until there is no smoke; remove it and cool it to room temperature, then add concentrated nitric acid with a volume fraction of 68% 5mL and evaporate to dryness; transfer to a muffle furnace at 490°C for about 5 hours, cool to room temperature, take out, add 5mL of 20% hydrochloric acid solution, transfer to a 50mL volumetric flask, and dilute to volume with water.

[0036] 2. Detect the content of various elements in the milk powder sample after ashing.

[0037] 1) The preparation method of the element standard solution is the same as that described in step 1) of Part 2 of the first embodiment.

[0038] 2) Use an inductively coupled plasma emission spectrometer to detect the concentration of the above elements in the element standard solution, and formulate a standard c...

no. 3 example

[0049] 1. Ashing the cheese sample:

[0050] Weigh 4.9589g and 4.9990g of cheese samples into porcelain crucibles, place them on an electric heating plate at 60°C for low heat and char until no smoke occurs, remove them to room temperature and add 5 mL of concentrated nitric acid with a volume fraction of 67% and evaporate to dryness over low heat. Transfer to a muffle furnace and ignite at 490°C for 5 hours, take it out after cooling to room temperature, add 5mL of 20% hydrochloric acid solution, transfer to a 50mL volumetric flask, and dilute to volume with water.

[0051] 2. Detect the content of various elements in the cheese sample after ashing.

[0052] 1) The preparation method of the element standard solution is the same as that described in step 1) of Part 2 of the first embodiment.

[0053]2) Use an atomic absorption spectrophotometer to detect the concentrations of the above elements in the element standard solution, and formulate a standard curve for the correspon...

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Abstract

An ashing method and a detection method using the same. The ashing method is characterized by comprising the steps of: first heating a sample for charing; then adding concentrated nitric acid; and finally adding the mixture into a high temperature furnace for calcination. The invention provides a detection method, comprising the step of ashing on the sample by using the above ashing method. The ashing method and detection method provided by the invention optimize operation steps, simplify operations and consume less time.

Description

technical field [0001] The invention relates to an ashing method, in particular to an ashing method and a detection method using the same. Background technique [0002] In the process of food production and inspection, it is often necessary to detect the element content in the sample, and judge whether the food has been added raw materials or food additives that do not meet the requirements of hygienic standards, or has been contaminated during processing, storage and transportation. When performing element detection, it is usually necessary to pre-treat the sample to destroy the organic matter in it. [0003] The commonly used method for destroying organic matter in samples is dry ashing method, which decomposes organic matter in samples by high-temperature burning (500°C-600°C). The existing dry ashing method first carbonizes the sample, puts the carbonized sample into a high-temperature furnace and burns it for a period of time, takes it out to cool and weigh it, and bur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N21/31G01N21/73
Inventor 其其格常建军乌尼尔高娃满都呼宋晓东
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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