Fig. 1. Chemical structure of active marker substance in Unimark 1494DB and o-cresolphthalein.
Fig. 2. GC-MS Scan chromatogram of Unimark 1494DB.
Fig. 3. Mass spectra of active marker in Unimark 1494DB and o-cresolphthalein.
Fig. 4. GC-MS Scan chromatogram of diesel fuel added with 5,000 mg/L Unimark 1494DB.
Fig. 5. GC-MS SIM chromatogram of diesel fuel added with 5,000 mg/L Unimark 1494DB.
Fig. 6. Calibration curves for Unimark 1494DB in diesel obtained by GC-MS SIM mode.
Table 1. Common fuel markers for legal use
Table 2. Operating conditions of GC-MS
Table 3. Precision and accuracy of Unimark 1494DB standard solutions in diesel fuel
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