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

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 i