fulvic acid


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Noun1.fulvic acid - a yellow to yellow-brown humic substance that is soluble in water under all pH conditions; "they measured the fluvial fulvic acid"
humic substance - an organic residue of decaying organic matter
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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.
Investigation and analysis of organic compounds in Russian soil revealed contents of highly concentrated fulvic acid. Additionally, it was found that fulvic acid, together with CaCl2 (a deicing agent), causes chromium plating corrosion.
Fulvic acid was isolated from the agriculture soil of District Naushahro Feroz, Sindh, Pakistan by International Humic Substances Society (IHSS) method.