humic substance

Noun
  1. An organic residue of decaying organic matter (synset 114933470)
    is a type of: organic compound - any compound of carbon and another element or a radical
    subtypes:
    • fulvic acid - a yellow to yellow-brown humic substance that is soluble in water under all pH conditions
    • humic acid - a dark brown humic substance that is soluble in water only at pH values greater than 2
    • humin - a black humic substance that is not soluble in water

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