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

Antonio Gianguzza, Daniela Piazzese, Francesco Crea, Silvio Sammartano, Sergio Sammartano

Risultato della ricerca: Articlepeer review

32 Citazioni (Scopus)

Abstract

The speciation of some high molecular weight polycarboxylates was studied in different ionic media. Polyacrylates hereinvestigated (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) andquite stable complexes with alkaline earth metal cations (K>106 mol l1, t=25 jC, I=0 mol l1). Results are reported fromexperiments performed in a multicomponent electrolyte solution simulating the major composition of seawater (artificialseawater). Protonation constants in this medium are expressed as a polynomial function of S1/2 (S=salinity) and the sharplowering with respect to values obtained in non-interacting aqueous tetraalkylammonium salts can be ascribed to the formationof alkali and alkaline earth cation complexes. A simplified approach, according to which the seawater salt is considered as asingle 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 molecularweight: empirical equations to take into account these functions are also given
Lingua originaleEnglish
pagine (da-a)33-44
Numero di pagine12
RivistaMarine Chemistry
Volume86
Stato di pubblicazionePublished - 2004

All Science Journal Classification (ASJC) codes

  • Oceanography
  • ???subjectarea.asjc.1600.1600???
  • Environmental Chemistry
  • Water Science and Technology

Fingerprint Entra nei temi di ricerca di 'Speciation of organic matter in natural waters. Interaction of polyacrylates with the major cation components of seawater'. Insieme formano una fingerprint unica.

Cita questo