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Quantification of lignin oxidation products as vegetation biomarkers in speleothems and cave drip water

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Figure

Figure 1. Process chart of the overall sample preparation procedure. A detailed description of the individual steps is given in Sect
Table 1. Names and abbreviations of the analytes with the respective m/z values of their deprotonated molecular ions [M-H]− and theirspecific daughter ions.
Figure 3. Recovery rates of the 13 LOPs on oasis HLB SPE cartridges eluted with acetonitrile (ACN), acetonitrile with ammonia (ACN +NH3), methanol (MeOH), and methanol with ammonia (MeOH+NH3)
Figure 5. Results of dissolved stalagmite samples (light blue bars with diagonal stripes) compared to ground stalagmite samples (grey bars).Dissolving of the samples led to higher amounts of LOPs.
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