The speciation of some high molecular weight polycarboxylates was studied in different ionic media. Polyacrylates here investigated (W=2.0, 5.1 and 20.0 kDa) form weak species with alkali metal cations (K=102 mol l1, t=25 jC, I=0 mol l1) and quite stable complexes with alkaline earth metal cations (K>106 mol l1, t=25 jC, I=0 mol l1). Results are reported from experiments performed in a multicomponent electrolyte solution simulating the major composition of seawater (artificial seawater). Protonation constants in this medium are expressed as a polynomial function of S1/2 (S=salinity) and the sharp lowering with respect to values obtained in non-interacting aqueous tetraalkylammonium salts can be ascribed to the formation of alkali and alkaline earth cation complexes. A simplified approach, according to which the seawater salt is considered as a single 1:1 salt, was used to describe the total interacting ability of the major components of seawater towards polyacrylates. Protonation and complex formation data are reported as a function of the degree of proton dissociation and of the molecular weight: empirical equations to take into account these functions are also given

C DE STEFANO, GIANGUZZA A, D PIAZZESE, & S SAMMARTANO (2004). Speciation of organic matter in natural waters. Interaction of polyacrylates with the major cation components of seawater. MARINE CHEMISTRY, 86(1-2), 33-44 [10.1016/j.marchem.2005.03.012].

Speciation of organic matter in natural waters. Interaction of polyacrylates with the major cation components of seawater

GIANGUZZA, Antonio;PIAZZESE, Daniela;SAMMARTANO, Sergio
2004

Abstract

The speciation of some high molecular weight polycarboxylates was studied in different ionic media. Polyacrylates here investigated (W=2.0, 5.1 and 20.0 kDa) form weak species with alkali metal cations (K=102 mol l1, t=25 jC, I=0 mol l1) and quite stable complexes with alkaline earth metal cations (K>106 mol l1, t=25 jC, I=0 mol l1). Results are reported from experiments performed in a multicomponent electrolyte solution simulating the major composition of seawater (artificial seawater). Protonation constants in this medium are expressed as a polynomial function of S1/2 (S=salinity) and the sharp lowering with respect to values obtained in non-interacting aqueous tetraalkylammonium salts can be ascribed to the formation of alkali and alkaline earth cation complexes. A simplified approach, according to which the seawater salt is considered as a single 1:1 salt, was used to describe the total interacting ability of the major components of seawater towards polyacrylates. Protonation and complex formation data are reported as a function of the degree of proton dissociation and of the molecular weight: empirical equations to take into account these functions are also given
C DE STEFANO, GIANGUZZA A, D PIAZZESE, & S SAMMARTANO (2004). Speciation of organic matter in natural waters. Interaction of polyacrylates with the major cation components of seawater. MARINE CHEMISTRY, 86(1-2), 33-44 [10.1016/j.marchem.2005.03.012].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/7321
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