IMIS | Lifewatch regional portal

You are here


[ report an error in this record ]basket (0): add | show Print this page

The diffusion coefficient of dissolved silica revisited
Rebreanu, L.; Vanderborght, J.P.; Chou, L. (2008). The diffusion coefficient of dissolved silica revisited. Mar. Chem. 112(3-4): 230-233.
In: Marine Chemistry. Elsevier: Amsterdam. ISSN 0304-4203; e-ISSN 1872-7581, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 279923 [ OMA ]

Author keywords
    Diffusion; Diffusion coefficients; Dissolved silica; Freshwater;

Authors  Top 
  • Rebreanu, L., more
  • Vanderborght, J.P., more
  • Chou, L., more

    The diffusion coefficient of dissolved silica was determined for two different salinities, 36 and 0, at temperatures ranging from 2°C to 30°C and at an average pH value of 8.1. Our results show limited influence of salinity and a variation by a factor of 2 to 3 of the silica diffusion coefficient within the temperature range considered in this study. The values obtained at 25°C are in agreement with previous work carried out at room temperature for seawater and freshwater. The dependency on temperature and viscosity of the diffusion coefficient agrees well with the Einstein-Stokes equation. The composition of the solvent appears to be an important factor because it modifies the viscosity and allows for the complexation of the dissolved silica with less mobile ions, while its pH controls the dissolved silica speciation. In seawater, the higher viscosity and the presence of dissociated and polymeric species result in a decrease of the diffusion coefficient compared to freshwater systems.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors