The Adsorption of Saxitoxin to Clays and Sediments in Fresh and Saline Waters

Author(s)

Justina M. Burns, University of South Carolina - ColumbiaFollow
Sherwood Hall, Food & Drug AdministrationFollow
John L. Ferry, University of South Carolina - ColumbiaFollow

Document Type

Article

Subject Area(s)

Chemistry

Abstract

The adsorption of saxitoxin to Na- and Ca-montmorillonite, kaolin (crystalline and amorphous), kaolinite, Bread and Butter Creek sediment (an estuarine tidal creek), Gulf of Mexico sediment, and Santa Barbara Basin sediment in deionized water and 32‰ salinity simulated seawater (Instant Ocean™) is reported. Adsorption was partially reversible for all cases and best described using a Freundlich isotherm. The corresponding Freundlich constants (K_F) ranged from 8.83 × 10³ μmol/kg to 6.76 × 10⁴ μmol/kg for freshwater and 4.73 × 10³ μmol/kg–1.11 × 10⁴ μmol/kg for seawater. There is a positive linear correlation seen between the K_F values and the cation-exchange capacity of the adsorbents. The release of saxitoxin from previously equilibrated adsorbents was determined in freshwater (0–18%) and seawater (4–53%).

Digital Object Identifier (DOI)

https://doi.org/10.1016/j.watres.2009.02.004

Publication Info

Water Research, Volume 43, Issue 7, 2009, pages 1899-1904.

Rights

© Water Research 2009, Elsevier Ltd.

APA Citation

Burns, J., Hall, S., & Ferry, J. (2009). The Adsorption of Saxitoxin to Clays and Sediments in Fresh and Saline Waters. Water Research, 43(7), 1899–1904. https://doi.org/10.1016/j.watres.2009.02.004