Rapid analysis of benzotriazole UV absorber and phosphorus antioxidants by Direct Insertion Probe (DIP)-MS/MS
Introduction
A lot of additives are used in plastics and other molded products, depending on the application. Thermal extraction-GC/MS and direct analysis combined with solvent extraction are used in general MS measurement of additives. Especially, direct analysis allows more rapid measurement than GC-MS. On the other hand, the mass spectrum tend to be complex because the additives are ionized at the same time, and cannot be analyzed by NIST library search. Therefore, analysis based on accurate mass and isotope pattern is required, and it is difficult to confirm additives by direct analysis such as DIP-MS in GC-QMS, even if the target component is clear. In contrast, DIP-MS/MS can select only specific ion derived from the target component for MS/MS measurement, and thus it possible to confirm the additives from product ion scan measurement. In this report, we tried to identify the additives by DIP-MS/MS using a sample mixture of a benzotriazole UV absorber and a phosphorus antioxidant.