The protonation of polyacrylate in seawater. Analysis of concentration effects

被引:6
|
作者
Battaglia, G [1 ]
Crea, F [1 ]
Crea, P [1 ]
Sammartano, S [1 ]
机构
[1] Univ Messina, Dipartimento Chim Inorgan, I-98166 Messina, Italy
关键词
D O I
10.1002/adic.200590075
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
The protonation of polyacrylate (PAA, MW 2 kDa) was studied potentiometrically at 25 degrees C, in mixed electrolyte aqueous solution simulating the composition of seawater, in the salinity range 30 <= S <= 40. The salt composition of different solutions was varied in order to study its effect on apparent protonation constants. Results were analysed using two fairly different approaches: by simple regression analysis on a combination of concentration parameters and salinity, and by canonical correlation analysis. Unexpectedly we found that variations on protonation constants, due to the different relative component concentrations, are fairly low, revealing a sort of buffering capacity of seawater respect to protonation properties of polyacrylate (and likely for other HMW and LMW polycarboxylates). The intrinsic protonation constant of polyacrylate 2 kDa at 25 degrees C and 35 salinity is log (K) over bar (H*) = log K-int = 4.399 +/- 0.004. The use of different pH scales and standard seawater compositions is also discussed.
引用
收藏
页码:643 / 656
页数:14
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