Abstract
In environmental analysis, the commercial reagent and reference material products of analyte compounds are indispensable for chromatography such as GC/MS and LC/MS. However, most of their purities are not certificated traceability to the International System of Units (SI). Hence the possibility that their obscure purities greatly ruin the reliability of the quantitative value is incontrovertible. In this study, the purities of forty one commercial pesticide reagent products (new or old) were determined by a quantitative analytical method which is traceable to SI using nuclear magnetic resonance (qNMR). qNMR is a rapid and simple quantitative analysis method and no reference compound of analyte is needed. The purities of ten commercial reagent products among our measured forty one products are different more than 5% to their labeled purities by the manufacturers, and the values were found in 47.9-94.8%. Therefore it consequently seems that the differences between SI traceable purities and labeled purities cause the error of 5.1-50.8% to the quantitative values of analytes. This result represents that qNMR analysis has potential to work as a bridge of SI traceability and the quality control of reagent product using qNMR is greatly important to secure the accuracy of analytical data.
