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Method for determining aluminum content in composite swelling agent by microwave digestion-graphite furnace atomic absorption method

A technology of graphite furnace atom and compound leavening agent is applied in the field of detection and analysis, which can solve the problems of economic loss of aluminum-containing products, inaccurate detection results, expensive instruments, etc., to eliminate ion interference, improve measurement sensitivity, and improve measurement sensitivity. and precision effects

Inactive Publication Date: 2016-08-31
广州中全产品检测有限公司
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Problems solved by technology

[0003] In order to solve the deficiencies in the above-mentioned prior art, to overcome the inaccurate detection results of the titration method and the difficulty in purchasing the instruments used by the inductively coupled plasma mass spectrometry, which caused the aluminum-containing products to flow into the market and be subject to legal sanctions and Economic loss, the object of the present invention is to provide a kind of method that adopts microwave digestion-graphite furnace atomic absorption method to measure aluminum content in composite leavening agent

Method used

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  • Method for determining aluminum content in composite swelling agent by microwave digestion-graphite furnace atomic absorption method
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  • Method for determining aluminum content in composite swelling agent by microwave digestion-graphite furnace atomic absorption method

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Embodiment 1

[0025] (1) Use microwave digestion sample for pretreatment:

[0026] Weigh 0.5000g of the composite leavening agent sample after drying at 85°C for 4 hours, put it in a microwave digestion tank, add 4ml of nitric acid, and then digest it after tightening the lid; react at 85°C for 10 minutes, React for 10 minutes, react at 160°C for 10 minutes, and react at 190°C for 10 minutes; take it out after cooling, and put the acid on a temperature-controlled electric heating plate at 160°C to the size of a soybean grain, let it cool and transfer the digestive juice Put it into a 50ml volumetric flask, wash the jar and the inner cover with water for 4 times, put the lotion in the volumetric flask and set the volume to the mark, mix well to obtain the sample solution to be tested, and set aside; prepare a blank control solution at the same time;

[0027] (2) adopt graphite furnace atomic absorption method to measure the content of aluminum in the composite leavening agent:

[0028] a. S...

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Abstract

The invention belongs to the technical field of detection and analysis, and in particular, relates to a method for determining the aluminum content in a composite swelling agent by a microwave digestion-graphite furnace atomic absorption method. The method includes two steps: carrying out sample pretreatment and microwave digestion, and determining the aluminum content in the composite swelling agent by the graphite furnace atomic absorption method. A sample is subjected to nitric acid microwave digestion, magnesium nitrate is added as a matrix modifier to eliminate interference, then the sample is taken and injected into a graphite furnace with a pyrolysis-coating graphite tube and is measured, and the aluminum content in the sample is calculated by a standard curve. The method adopting microwave digestion as the pre-treatment method, the use time is less, perchloric acid is not added during digestion, magnesium nitrate is added as the matrix modifier after digestion, the interference caused by measurement is avoided, the measuring sensitivity and precision are improved, and the accuracy of the detection is ensured; through the pyrolysis coating, the graphite tube not only can reduce the interference of a matrix and other elements and improve the measurement sensitivity, but also enables the service life of the graphite tube to be prolonged and reduces the cost.

Description

technical field [0001] The invention belongs to the technical field of detection and analysis, in particular to a method for measuring the aluminum content in a composite leavening agent by microwave digestion-graphite furnace atomic absorption method. Background technique [0002] In the daily sample testing, according to the manufacturer of the compound leavening agent, the compound leavening agent produced by it was detected to contain aluminum, and it was also detected to contain aluminum by the law enforcement department in the market supervision, and the content was relatively high. In actual production, aluminum-containing raw materials have never been added, which has caused the manufacturer to be wronged and damaged. At present, there are three methods to detect aluminum. Enterprises generally carry out factory inspection according to the titration method in Appendix D of the product standard GB 25591-2010 "National Food Safety Standard Food Additive Compound Leaven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/44
CPCG01N1/44G01N21/3103
Inventor 何金银曾永青曾常青
Owner 广州中全产品检测有限公司
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