On the estuarine mixing of dissolved substances in relation to colloid stability and surface properties |
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| Authors: | Keith A Hunter |
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| Institution: | Chemistry Department, University of Otago, P.O. Box 56, Dunedin, New Zealand |
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| Abstract: | The estuarine mixing of dissolved Fe, Cu, Ni, Si and surface-active organic matter has been investigated in the Taieri Estuary, New Zealand, simultaneously with measurements of the electrokinetic charge on colloidal particles. Dissolved Fe showed almost quantitative removal from solution characteristic of the coagulation of iron-containing colloids by seawater electrolytes. Surface active organic matter behaved conservatively, indicating that a relatively constant fraction of estuarine organic matter is surface active, but that organic species associated with iron during removal are a minor fraction. Results for Cu, Ni and Si were scattered but offered no evidence for gross removal during estuarine mixing. The negative charge on suspended colloids was not reversed by adsorption of seawater cations, but remained uniformly negative throughout the salinity range, decreasing sharply in magnitude during the first few %. salinity. |
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