Humic substances (HS) are relatively recalcitrant colored organic compounds naturally formed during long-term decomposition and transformation of biomass residues. The color of humic substances varies from bright yellow to light or dark brown leading to black.
Humic substances (HS) are relatively recalcitrant colored organic compounds naturally formed during long-term decomposition and transformation of biomass residues. The color of humic substances varies from bright yellow to light or dark brown leading to black.
Source: Wikipedia "Humic substance" · CC BY-SA 4.0
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