Właściwości HA

Carboxyl	^\>H ^/^0H	Carbonyl	/OO
		Ether	\ / / X
Phenolic	o		O
		Ester	—c—O—C—1
Alcohol	—C-OH
Methoxyl	-0--CH,

TABLE 5-12 Physical and Fulvic Acids	Chemical Properties ol Humic and
Property	Mumie Acids Fulvic Acids

Elemental Composition (% by weight)

C	50-80	40-50
M	4 6	4 6
O	30 35	44 50
N	2-4	<1-3
S	1-2	0-2
Solubility in strong acid (pH 1)	Not soluble	Soluble
Molecular weight rangę	f sever.al inillion	180-10.000
Functional group distribution	Percent of oxygen in
	indicated iunctional group
carbozyl —COOH	14 45	50-65
phenol	10-38	9-19
alcohol —(j;—OH	13-15	11-16
carbonyl —0=0	4-23	4-11
methoxyl —O—CH,	1-5	1-2

Source: M. Schnitzer and S. U. Khan, Humic Substances in Ihe Enviion-ment, Dekker, New York, 1972.