| Popis: |
The chromatographic behaviour of benzotriazole and several of its derivatives on gas chromatographic (GC) fused-silica wall-coated open-tubular columns and reversed-phase liquid chromatographic (LC) columns is reported. Although severe tailing and irreversible retention were observed on polar GC columns, considerably improved behaviour was obtained on non-polar OV-101 and moderate polarity BP-10 columns, with detection limits (flame ionization detection) being in the nanogram range. Of the reversed-phase LC columns examined, Spherisorb 5 C8 was the most suitable, producing little or no tailing. Detection limits on this column with UV detection at 254 nm were also in the nanogram range. An LC method for determining benzotriazoles in both automotive cooling waters and cooling water formulations involving only dilution of the sample prior to analysis, is described. |
