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Compared with humic acid, fulvic acid has lower molecular weight, less carbon and more oxygen in its molecular structure, and higher content of acid functional group (- COOH) than humic acid. In addition, fulvic acid contains more ketone carbonyl and hydroxyl than humic acid, so it has stronger acidity in aqueous solution than humic acid. At present, the specific molecular structure of fulvic acid is not very clear. Based on the carbon skeleton structure of humus, a structure model of fulvic acid is obtained as shown in Figure 1. The carbon content of fulvic acid is generally between 40% and 50%, the hydrogen content is between 4% and 6%, and the oxygen content is between 44% and 50%.
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