Abstract
In this paper SIT and Pitzer models are used for the first time to describe the interactions of natural and synthetic
polyelectrolytes in natural waters. Measurements were made potentiometrically at 25 8C in single electrolyte media, such as
Et4NI and NaCl (for fulvic acid 0.1bI /mol L 1b0.75), and in a multi-component medium simulating the composition of natural
waters at a wide range of salinities (for fulvic and alginic acids: 5bS b45) with particular reference to sea water [Synthetic Sea
Water for Equilibrium studies, SSWE]. In order to simplify calculations, SSWE was considered to be a bsingle saltQ BA, with
cation B and anion A representing all the major cations (Na+, K+, Mg2+, Ca2+) and anions (Cl , SO4
2 ) in natural sea water,
respectively. The ion pair formation model was also applied to fulvate and alginate in artificial sea water by examining the
interaction of polyanions with the single sea water cation. Results were compared with those obtained from previous speciation
studies of synthetic polyelectrolytes (polyacrylic and polymethacrylic acids of different molecular weights). Results indicate that
the SIT, Pitzer and Ion Pairing formation models used in studies of low molecular weight electrolytes may also be applied to
polyelctrolytes with a few simple adjustments.
Lingua originale | English |
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pagine (da-a) | 93-105 |
Rivista | Marine Chemistry |
Volume | 99 |
Stato di pubblicazione | Published - 2006 |
All Science Journal Classification (ASJC) codes
- ???subjectarea.asjc.1900.1910???
- ???subjectarea.asjc.2300.2312???
- ???subjectarea.asjc.2300.2304???
- ???subjectarea.asjc.1600???