Ionization constants of a soil fulvic acid

Authors
Ramos, A Lopez, S Lopez, R Fiol, S Arce, F Antelo, JM
Citation
A. Ramos et al., Ionization constants of a soil fulvic acid, ANALUSIS, 27(5), 1999, pp. 418-420
Citations number
8
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALUSIS
ISSN journal
03654877 → ACNP
Volume
27
Issue
5
Year of publication
1999
Pages
418 - 420
Database
ISI
SICI code
0365-4877(199906)27:5<418:ICOASF>2.0.ZU;2-O
Abstract
The ionization constants of a soil extracted fulvic acid were obtained anal ysing the potentiometric titration curves at different fulvic acid concentr ations (20, 40 and 80 mg/L) and different background electrolyte concentrat ions from 5 10(-3) M to 1.0 M, The results confirm the presence of two type s of acidic groups with ionization constants in the range 4.27 < pK(1) < 4. 84 and 7.85 < pK(2) < 8.81, respectively.