How do we measure the purity of aluminum?

The purity of aluminum is typically measured using various analytical techniques. One common method is spectroscopy, which can identify and quantify the elements present in a sample. Techniques such as X-ray fluorescence (XRF) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) are used to analyze the composition of aluminum alloys and determine the concentration of impurities. Additionally, metallographic examination can reveal the presence of inclusions or other impurities that affect purity. The American Society for Testing and Materials (ASTM) and other standards organizations provide specific guidelines and methods for testing aluminum purity.