Chemistry, 10.03.2020 07:39 sammizwang

Soil contains organic matter called humus. Humus is classified into humic and nonhumic materials. Humic materials are operationally divided into three main fractions:
Humic acid, fulvic acid, and humin.

Properties of Humic Materials.
Features Humic Acid Fulvic Acid Humin
Solubility in water soluble in alkaline pHs soluble at all pHs insoluble at all pHs
Aromatic content highly aromatic highly aromatic highly aromatic
Carboxylic acid content some high low
Phenolic content some some some

Humic materials
↓ HCl
soluble insoluble
↓ ↓NaOH
Fraction A soluble insoluble
↓ ↓
Fraction B Fraction C

In flowchart above, Fraction B is most likely:

a) Humic acid. b) Fulvic acid. c) Humin.

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Soil contains organic matter called humus. Humus is classified into humic and nonhumic materials. Hu...