Figure 4.

Organic polar compounds identified as their TMS derivatives by GC-MS in acid hydrolysed F_H2O fractions, which were obtained by desalting hydrophilic tholins synthesized in the presence of alkaline aqueous aerosols at an initial pH = 12 (experiments 4 and 8): (a) Representative GC-MS chromatogram of F_H2O fraction from experiment 8; (b–d) correspond to amino acids, carboxylic acids and N-heterocycles, respectively, found in F_H2O fractions from experiments 4 and 8. The numbers shown on the peaks of the GC-MS chromatogram and under the abscissa axis correspond with the numeration of analytes shown in Fig. 2. The coloured bars indicate the presence of a concrete analyte in the corresponding sample.