The fractionation/concentration of aquatic humic substances by the sequential membrane system and their characterization with mass spectrometry

Citation
K. Ikeda et al., The fractionation/concentration of aquatic humic substances by the sequential membrane system and their characterization with mass spectrometry, WATER SCI T, 42(7-8), 2000, pp. 383-390
Citations number
7
Language
INGLESE
art.tipo
Review
Categorie Soggetti
Environment/Ecology
Journal title
WATER SCIENCE AND TECHNOLOGY
ISSN journal
0273-1223 → ACNP
Volume
42
Issue
7-8
Year of publication
2000
Pages
383 - 390
Database
ISI
SICI code
0273-1223(2000)42:7-8<383:TFOAHS>2.0.ZU;2-1
Abstract
The sequential membrane system and electrospray ionization mass spectrometr y are investigated on their usefulness for characterizing aquatic humic sub stances. In this research, the Suwannee River Fulvic Acid (SRFA) was used f or the investigation. For the mass spectrometry, the optimum analytical con ditions were determined. Two indices (i.e., the total ion intensity and the averaged molecular weight) obtained from the spectrum were found relevant for evaluating the physical characteristics of aquatic humic substances. Th e repetitious peaks at a discrete of 14 Da in the lower m/z range of the ac quired spectrum suggested that the SRFA has the -CH2- based structure in it s lower molecular weight region. For the sequential membrane system, the op timum operating conditions were determined. The SRFA could be fractionated and concentrated by this system. The significant difference of the averaged molecular weight among the concentrated fractions from the different size membranes indicated that this system is useful for the fractionation and co ncentration of the aquatic humic substances.