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. 2021 Jan 6;11(1):32. doi: 10.3390/life11010032

Figure 8.

Figure 8

Trends in relative organic functional group concentrations with time for the soluble organics of FAW (with and without minerals) as determined by FTIR for the peak intensity ratios of (a) C=O (ester)/C=C, (b) C=O (carboxyl, aldehyde, amide)/C=C, (c) C=O (carboxyl, aldehyde, amide)/C=O (ester), (d) CH2/CH3, and (e) (CH2 + CH3)/C=C. The C=O (ester), C=O (carboxyl, aldehyde, amide), and C=C peak intensities are obtained by the peak top height of the band around 1765, 1700, and 1600 cm−1, respectively, with the linear baseline between 1840 and 1520 cm−1. The CH2 and CH3 peak intensities are obtained by the peak top height of the band at 2935 cm−1 (CH2) and the band at 2960 cm−1 (CH3), respectively, with the linear baseline between 3010 and 2790 cm−1.