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

Research output: Contribution to journalArticlepeer-review

32 Citations (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
Original languageEnglish
Pages (from-to)33-44
Number of pages12
JournalMarine Chemistry
Volume86
Publication statusPublished - 2004

All Science Journal Classification (ASJC) codes

  • Oceanography
  • General Chemistry
  • Environmental Chemistry
  • Water Science and Technology

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