carboxylic acid

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Related to Carboxylic functional group: monocarboxylic acid
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2010), and suggested to be dominated by hydroxyl, carbonyl, and carboxylic functional groups (Sevilla and Fuertes 2009a, 2009b), which may therefore improve the chemical reactivity of the charcoal in soils.
The results of XPS and NMR, described below, confirm the greater presence of carboxylic functional groups in the hydrochar than in the biochar.