According to solubility and color in solvents, HA can be classified into
fulvic acid, hymatomalenic acid, pyrotomalenic acid (Maryganova et al., 1995).
Analyses were carried out to determine soil C, SOC, SIC, permanganate oxidisable C (POXC), cold water extractable C (CWEC), hot water extractable C (HWEC), extractable humic substances (CEX), C in humic acids (CHa)> C in
fulvic acids (CFA) and organic C functional groups.
Elementary analysis CHN/O, elementary ratios C/N, H/C and O/C of humic acids and
fulvic acids purified from the five organic substrates Substrate C H N O C/N H/C O/C % Humic acids T1 51.52 4.86 3.96 39.66 13.01 0.09 0.77 T2 51.36 5.12 4.49 39.03 11.44 0.10 0.76 T3 50.18 5.16 5.14 39.52 9.76 0.10 0.79 T4 50.15 5.19 6.11 38.55 8.21 0.10 0.77 T5 51.96 5.33 3.56 39.15 14.60 0.10 0.75 Mean 51,03 5,13 4,65 39,18 11,40 0,10 0,77
Fulvic acid C H N O C/N H/C O/C T1 41.14 4.55 3.94 50.37 10.44 0.11 1.22 T2 42.13 4.44 4.02 49.41 10.48 0.11 1.17 T3 6.19 2.14 0.82 90.85 7.55 0.35 14.68 T4 2.86 2.37 0.60 94.17 4.77 0.83 32.93 T5 4.35 3.31 0.61 91.73 7.13 0.76 21.09 Mean 19.33 3.36 2.00 75.31 8.07 0.43 14.22 Table 4.
A patented isolation procedure yielding carbohydrate-derived
fulvic acid (CHD-FvA) mimics the above information almost entirely.
Fraction bound to colloid
fulvic acid (FA) and humic acid (HA) (a, c, e) and free ion activity (b, d, f) of Cd in biochar (BC) eluates collected at various liquid to solid (L/S) ratios, predicted by WHAM.
NOM consists of
fulvic acid (FA), the component soluble in acidic water, and humic acid (HA), the component insoluble in acidic water.
The river
fulvic acid (FA) and natural organic matter were a standard sample obtained from the Suwannee River and purchased from the International Humic Substances Society.
A comparative study of the adsorption of humic acid,
fulvic acid and phenol onto Bacillus subitilis and activated sludge.
Watanable, Total Synthesis of
Fulvic Acid, J Chem Soc Chem Comm, 1565 (1984).
Fulvic acid was isolated from the agriculture soil of District Naushahro Feroz, Sindh, Pakistan by International Humic Substances Society (IHSS) method.