The purity of laboratory chemicals with regard to measurement uncertainty
Abstract
The purity P of laboratory chemicals is often declared in the form P
≥
xy% (e.g., P
≥ 97%). With a randomly chosen set of 40 compounds we found that their purity is generally closer to 100% than to the lower limit. The distribution of the purity data as found in the laboratory depends on the analytical technique used. Whereas purities determined by