Abstract
The absolute value of substance should be determined with traceability to International System of Units (SI units). However, it is very difficult to provide and/or obtain the analytical standards with the purity certifications because miscellaneous chemicals are targeted in the environmental assessments. In fact, the most of commercial reagents of standards are labeled relative values on manufacturer’s own approaches without traceability to SI units. This missing traceability causes a problem that quantitative values using chromatography are not robust because of getting only relative value against its analytical standards. In this study, to find a solution to this problem, we targeted determination of the purities of commercial reagents of environmental pollutant polycyclic aromatic hydrocarbon (PAH) which are used generally as the analytical standards. 18 kinds of PAH and hydroxyl PAH (OH-PAH) were measured the reliable purity by using AQARI (Accurate quantitative NMR with internal reference substance) method which is a traceable quantitative technique. The purities were distributed from 94.6 ± 1.2 to 101.6 ±0.9 % (arithmetic mean±RSD).
