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Table 2 Description of LC-OCD fractions. Modified from Huber et al. (2011), Penru et al. (2013), and Zhu et al. (2015)
From: Dissolved organic compounds in geothermal fluids used for energy production: a review
Fraction | Properties | Description |
|---|---|---|
Hydrophobic organic carbon | Hydrophobic | Lipids (fats) released from bacteria and algae |
Biopolymers | Not UV-absorbable, hydrophilic | Polysaccharides and proteins |
Humic substances | Highly UV-absorbable, hydrophobic | Side products of bacterial decay |
Building blocks | UV-absorbable | Breakdown products of humic substances |
Low molecular weight organic acids | Negatively charged | Aliphatic acids |
Low molecular weight neutrals | Weakly or uncharged hydrophilic, amphiphilic | Alcohols, aldehydes, ketones, amino acids |