EFFECT OF CONCENTRATION, PH, AND IONIC-STRENGTH ON THE VISCOSITY OF SOLUTIONS OF A SOIL FULVIC-ACID

Authors
REY F FERREIRA MA FACAL P MACHADO AASC
Citation
F. Rey et al., EFFECT OF CONCENTRATION, PH, AND IONIC-STRENGTH ON THE VISCOSITY OF SOLUTIONS OF A SOIL FULVIC-ACID, Canadian journal of chemistry, 74(3), 1996, pp. 295-299
Citations number
26
Categorie Soggetti
Chemistry
Journal title
Canadian journal of chemistry → ACNP
ISSN journal
00084042
Volume
74
Issue
3
Year of publication
1996
Pages
295 - 299
Database
ISI
SICI code
0008-4042(1996)74:3<295:EOCPAI>2.0.ZU;2-V
Abstract
The influence of pH (3.0-8.0), ionic strength (0.005-0.10 M), and conc entration (ca. 50-300 mg L(-1)) on the viscosimetric behaviour of solu tions of a soil fulvic acid has been determined. The results show a co mplex influence of the concentration on the specific viscosity with ma xima at about 80-100 mgr L(-1) and a minimum at 140-160 mg L(-1). The viscosity is minimum at pH ca. 6 and decreases when the ionic strength increases. The results are interpreted by a rod-type model from which the dimensions of fulvic acid molecules are calculated.