Using solution equilibria to determine average molecular weight of the Suwannee River fulvic acids

被引：13

作者：

Fattahi, A ^{[1
]}

Solouki, T ^{[1
]}

机构：

[1] Univ Maine, Dept Chem, Orono, ME 04469 USA

来源：

ANALYTICA CHIMICA ACTA | 2003年 / 496卷 / 1-2期

关键词：

fulvic acids; average molecular weight; solution equilibria; molecular weight; equilibrium constant;

D O I：

10.1016/S0003-2670(03)01010-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A systematic treatment of chemical equilibria is used to determine the average molecular weight (AMW) of the Suwannee River fulvic acids directly from aqueous solutions. In addition to molecular weight determination, parameters such as equilibrium constant and reaction stoichiometry can be calculated; in this approach, it is not necessary to measure the initial mass of unknown analytes. The key experimental and theoretical considerations for systematic treatment of equilibrium and determination of unknown parameters are addressed. Results from the equilibrium considerations yield an AMW of 551 +/- 10 Da for the Suwannee River fulvic acid sample analyzed in this study. In addition to the Suwannee River fulvic acid sample, experimental data for selected monoprotic and polyprotic acids are presented and discussed. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：325 / 337

页数：13

共 19 条

[1] MOLECULAR-WEIGHT OF AQUATIC FULVIC-ACIDS BY VAPOR-PRESSURE OSMOMETRY
AIKEN, GR
MALCOLM, RL
[J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1987, 51 (08) : 2177 - 2184
[2] AIKEN GR, 1989, HUMIC SUBSTANCES, V2
[3] Elucidation of aluminum-fulvic acid interactions by gas-phase hydrogen/deuterium (H/D) exchange and electrospray Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR)
Alomary, A
Solouki, T
Patterson, HH
Cronan, CS
[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (13) : 2830 - 2838
[4] ALUMINUM COMPLEXATION BY AN AQUATIC HUMIC FRACTION UNDER ACIDIC CONDITIONS
BACKES, CA
TIPPING, E
[J]. WATER RESEARCH, 1987, 21 (02) : 211 - 216
[5] STABILITY-CONSTANTS FOR COMPLEXATION OF COPPER(II) IONS WITH WATER AND SOIL FULVIC ACIDS MEASURED BY AN ION-SELECTIVE ELECTRODE
BRESNAHAN, WT
GRANT, CL
WEBER, JH
[J]. ANALYTICAL CHEMISTRY, 1978, 50 (12) : 1675 - 1679
[6] DENOBILI M, 1989, HUMIC SUBSTANCES, V2
[7] Modified pulsed-field gradient NMR experiments for improved selectivity in the measurement of diffusion coefficients in complex mixtures: Application to the analysis of the Suwannee River fulvic acid
Dixon, AM
Larive, CK
[J]. ANALYTICAL CHEMISTRY, 1997, 69 (11) : 2122 - 2128
[8] High-resolution Fourier transform ion cyclotron resonance mass spectrometry of humic and fulvic acids by laser desorption/ionization and electrospray ionization
Fievre, A
Solouki, T
Marshall, AG
Cooper, WT
[J]. ENERGY & FUELS, 1997, 11 (03) : 554 - 560
[9] GAFFNEY JS, 1995, ACS SYM SER, V651, P138
[10] INTERACTION BETWEEN HUMIC ACID FRACTION OF SOILS AND CERTAIN METALLIC CATIONS
KHAN, SU
[J]. SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS, 1969, 33 (06): : 851 - &

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