eBook: Elemental Impurities
The US Pharmacopeia (USP) retired the existing wet chemistry heavy metals methods outlined in USP General Chapter <231> with an instrument-based approach on January 1, 2018. Though the existing wet chemistry methods have been in effect for nearly 100 years, the methods were non-specific and frequently failed to detect or underestimate the presence of some toxic elements that are potentially present in pharmaceutical ingredients.