USP Method 2232 will replace Method 231, used for determining elemental impurities in dietary supplements, and is currently going through the approval process and is expected to be promulgated in 2013. Method 2232 mandates the use of microwave digestion for those samples that are not readily soluble.
As a result of the promulgation of USP Method 2232, Nutraceutical companies are progressively incorporating microwave technology into their testing procedures. The CEM Discover SP-D and the MARS System both meet the requirements for Method 2232.