28 ENVIRONMENTAL LABORATORY structure CH3-(C-O+ )2-N+ .H)=CH2 =CH2 . , and also the ion at m/z 58 is


produced from Trialkylamines by a fission reaction involving C-C bond along of the amine chain (beta-position) lading to structure(CH3


4. Conclusions: Figure 6. GC/MS Chromatogram on m/z=91 for a sediment rivers sample for visualisation of Lineal Alkyl Benzenes (LABs). The alkyl n range 10-13.


In the sediment samples collected from the Somes river some important groups of molecular markers were identified. The detected groups of markers and their main characteristic are shown in Table 1. The main advantage of the method is that from a single measurement multiple characteristic parameters can be determined. Also, the method can be applied to the study of sediment originating from any aquatic medium such as lake, sea or wastewater treatment plant (WWTP).


References:


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10. R. P. Eganhause, Molecular Markers in Environmental Geochemistry, ACS Symposium Series 671, p 178-195. Washington DC, 1997


Figure 7. GC/MS chromatogram on m/z 58 for a sediment sample collected from river for visualisation of Trialkylamines and 2M-Ketones


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 m/z


Parameter 1 n-Alkanes 85


2 Acyclic Isoprenoids 183 3 Hopanes 4 PAHs


5 Benzothiophenes 6 LABs 7


191


178,202,228, 252,276,300


n of carbon, CPI


n of carbon, ratio Pristine/Phytane Ratio: 17β(H),21β(H)/ 17β(H), 21β(H)


Ratio:Fluorantene/(Fluorantene + Pyrene) and (Benz[a]antracene + Chrysene)


184,198,212,226,240 Relative intensity 91


TAMs and 2M-Ketones 58


n of carbon, relative intensity n of carbon, relative intensity


Benz[a]antracene/


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Author Contact Details Zaharie Moldovan, National Institute of Research and Development for Isotopic and Molecular Technology • 400293 Cluj-Napoca, Str. Donath 72-103 • Email: zaha@itim-cj.ro


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