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

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...

AI Technical Summary

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

Images