Alkaline earth metal cation exchange: Effect of mobile counterion and dissolved organic matter

Katrina Indarawis, Treavor H. Boyer

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The goal of this research was to provide an improved understanding of the interactions between alkaline earth metals and DOM under conditions that are encountered during drinking water treatment with particular focus on cation exchange. Both magnetically enhanced and nonmagnetic cation exchange resins were converted to Na, Mg, Ca, Sr, and Ba mobile counterion forms as a novel approach to investigate the exchange behavior between the cations and the interactions between the cations and DOM. The results show that cation exchange is a robust process for removal of Ca 2+ and Mg 2+ considering competition with cations on the resin surface and presence of DOM. DOM was actively involved during the cation exchange process through complexation, adsorption, and coprecipitation reactions. In addition to advancing the understanding of ion exchange processes for water treatment, the results of this work are applicable to membrane pretreatment to minimize fouling, treatment of membrane concentrate, and precipitative softening.

Original languageEnglish (US)
Pages (from-to)4591-4598
Number of pages8
JournalEnvironmental Science and Technology
Issue number8
StatePublished - Apr 17 2012
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry


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