thumbnail

Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid

Analytica Chimica Acta

By:
,
DOI: 10.1016/S0003-2670(00)81228-3

Links

Abstract

The molecular weight and aggregation tendency of a reference-soil fulvic acid in Armadale horizon Bh were determined by vapor-pressure osmometry using tetrahydrofuran and water as solvents. With tetrahydrofuran, number-average molecular weight values of 767 ?? 34 and 699 ?? 8 daltons were obtained from two separate sets of measurements. Two sets of measurements with water also yielded values within this range (754 ?? 70 daltons) provided that the fulvic acid concentration in water did not exceed 7 mg ml-1; at higher concentrations (9.1-13.7 mg ml-1) a number-average molecular weight of 956 ?? 25 daltons was resolved, providing evidence of molecular aggregation. Extension of these studies to 80% neutralized fulvic acid showed that a sizeable fraction of the sodium counter ion is not osmotically active.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Vapor-pressure osmometric study of the molecular weight and aggregation tendency of a reference-soil fulvic acid
Series title:
Analytica Chimica Acta
DOI:
10.1016/S0003-2670(00)81228-3
Volume
232
Issue:
1
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
123
Last page:
130
Number of Pages:
8