49
Figure 7. GC/MS chromatogram of m/z 58 for a sediment sample collected from river for visualisation of Trialkylamines and 2M-Ketones
presented is that from a single measurement multiple characteristic parameters can be determined. The method can also be applied to the study of sediment originating from any aquatic medium such as lake, sea or wastewater treatment plant (WWTP).
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Table 1. Molecular markers, characteristic ion (m/z) used in GC/MS profile and parameter used for characterisation of sediment organic mater
No Molecular marker 1 n-Alkanes
2 Acyclic Isoprenoids 3 Hopanes 4 PAHs
5 Benzothiophenes 6 LABs
m/z 85
183 191
178,202,228, 252,276,300
Parameter n of carbon, CPI
n of carbon, ratio Pristine/Phytane Ratio: 17β(H),21β(H)/ 17α(H), 21β(H)
Ratio: Fluorantene/(Fluorantene + Pyrene) and Benz[a]antracene/ (Benz[a]antracene + Chrysene)
184,198,212,226,240 Relative intensity 91
7 TAMs and 2M-Ketones 58
n of carbon, relative intensity n of carbon, relative intensity
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