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metals from seawater; however, information on the sorption capacity of natural colloidal matter and on the aggregation/disaggregation processes between the particle classes is still needed. CONCLUSIONS Th adsorption by alumina particles in seawater was found to be predominantly of Th hydrolysis complexes that are retained by a 1, 000 nominal molecular weight ultra-filter. Competing solution complexation of Th by Phaeodactylum tricornutum exudates and sorption by colloidal matter decreased Th adsorption by the alumina. The sorption of metals by colloidal matter (pre-existing in the experimental solution or added with particles) must be considered in laboratory determinations of Kd values. Field data on the concentration, composition, and aggregation reactions of natu-rally occurring colloidal matter are required to determine the effect of colloid adsorption on the marine geochemistry of trace metals. REFERENCES 1. Balistrieri, L., Brewer, P.G. and Murray, J.W., Scavenging residence times of trace metals and surface chemistry of sinking particles in the deep ocean. Deep-Sea Res., 1981, 28A. 101-121. 2. Whitfield, M. and Turner, D.R., The role of particles in regulating the composition of seawater. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley- Interscience, New York, 1987, pp. 457-493. 3. Morel, F.M.M. and Gschwend, P.M., The role of colloids in the partitioning of solutes in natural waters. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley-Interscience, New York, 1987, pp. 405-422. 4. Li, Y.-H., Burkhardt, L., Buchholtz, M., O'Hara, P. and Santschi, P.H., Partition of radiotracers between suspended particles and seawater. Geochim. Cosmochim. Acta, 1984, 48. 2011-2019. 5. Higgo, J.J.W. and Rees, L.V.C., Adsorption of actinides by marine sediment: Effect of the sediment/seawater ratio on the measured distribution ratio. Environ. Sci. Technol., 1986, 20. 483-490. 6. Gschwend, P.M. and Wu, S.-c., On the constancy of sediment-water partition co-efficients of hydrophobic organic pollutants. Environ. Sci. Technol., 1985, 19. 90-96. 7. Niven, S.E.H., The partitioning of thorium among dissolved, colloidal, and partic-ulate fractions in seawater. Ph.D. dissertation, Dalhousie University, 1988. 8. Broecker, W.S., Kaufman, A. and Trier, R.M., The residence time of thorium in surface sea water and its implications regarding the fate of reactive pollutants. Earth Planet. Sci. Lett., 1973, 20. 35-44.
DOI link for metals from seawater; however, information on the sorption capacity of natural colloidal matter and on the aggregation/disaggregation processes between the particle classes is still needed. CONCLUSIONS Th adsorption by alumina particles in seawater was found to be predominantly of Th hydrolysis complexes that are retained by a 1, 000 nominal molecular weight ultra-filter. Competing solution complexation of Th by Phaeodactylum tricornutum exudates and sorption by colloidal matter decreased Th adsorption by the alumina. The sorption of metals by colloidal matter (pre-existing in the experimental solution or added with particles) must be considered in laboratory determinations of Kd values. Field data on the concentration, composition, and aggregation reactions of natu-rally occurring colloidal matter are required to determine the effect of colloid adsorption on the marine geochemistry of trace metals. REFERENCES 1. Balistrieri, L., Brewer, P.G. and Murray, J.W., Scavenging residence times of trace metals and surface chemistry of sinking particles in the deep ocean. Deep-Sea Res., 1981, 28A. 101-121. 2. Whitfield, M. and Turner, D.R., The role of particles in regulating the composition of seawater. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley- Interscience, New York, 1987, pp. 457-493. 3. Morel, F.M.M. and Gschwend, P.M., The role of colloids in the partitioning of solutes in natural waters. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley-Interscience, New York, 1987, pp. 405-422. 4. Li, Y.-H., Burkhardt, L., Buchholtz, M., O'Hara, P. and Santschi, P.H., Partition of radiotracers between suspended particles and seawater. Geochim. Cosmochim. Acta, 1984, 48. 2011-2019. 5. Higgo, J.J.W. and Rees, L.V.C., Adsorption of actinides by marine sediment: Effect of the sediment/seawater ratio on the measured distribution ratio. Environ. Sci. Technol., 1986, 20. 483-490. 6. Gschwend, P.M. and Wu, S.-c., On the constancy of sediment-water partition co-efficients of hydrophobic organic pollutants. Environ. Sci. Technol., 1985, 19. 90-96. 7. Niven, S.E.H., The partitioning of thorium among dissolved, colloidal, and partic-ulate fractions in seawater. Ph.D. dissertation, Dalhousie University, 1988. 8. Broecker, W.S., Kaufman, A. and Trier, R.M., The residence time of thorium in surface sea water and its implications regarding the fate of reactive pollutants. Earth Planet. Sci. Lett., 1973, 20. 35-44.
metals from seawater; however, information on the sorption capacity of natural colloidal matter and on the aggregation/disaggregation processes between the particle classes is still needed. CONCLUSIONS Th adsorption by alumina particles in seawater was found to be predominantly of Th hydrolysis complexes that are retained by a 1, 000 nominal molecular weight ultra-filter. Competing solution complexation of Th by Phaeodactylum tricornutum exudates and sorption by colloidal matter decreased Th adsorption by the alumina. The sorption of metals by colloidal matter (pre-existing in the experimental solution or added with particles) must be considered in laboratory determinations of Kd values. Field data on the concentration, composition, and aggregation reactions of natu-rally occurring colloidal matter are required to determine the effect of colloid adsorption on the marine geochemistry of trace metals. REFERENCES 1. Balistrieri, L., Brewer, P.G. and Murray, J.W., Scavenging residence times of trace metals and surface chemistry of sinking particles in the deep ocean. Deep-Sea Res., 1981, 28A. 101-121. 2. Whitfield, M. and Turner, D.R., The role of particles in regulating the composition of seawater. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley- Interscience, New York, 1987, pp. 457-493. 3. Morel, F.M.M. and Gschwend, P.M., The role of colloids in the partitioning of solutes in natural waters. In Aquatic Surface Chemistry: Chemical Processes at the Particle-Water Interface, ed. W. Stumm, Wiley-Interscience, New York, 1987, pp. 405-422. 4. Li, Y.-H., Burkhardt, L., Buchholtz, M., O'Hara, P. and Santschi, P.H., Partition of radiotracers between suspended particles and seawater. Geochim. Cosmochim. Acta, 1984, 48. 2011-2019. 5. Higgo, J.J.W. and Rees, L.V.C., Adsorption of actinides by marine sediment: Effect of the sediment/seawater ratio on the measured distribution ratio. Environ. Sci. Technol., 1986, 20. 483-490. 6. Gschwend, P.M. and Wu, S.-c., On the constancy of sediment-water partition co-efficients of hydrophobic organic pollutants. Environ. Sci. Technol., 1985, 19. 90-96. 7. Niven, S.E.H., The partitioning of thorium among dissolved, colloidal, and partic-ulate fractions in seawater. Ph.D. dissertation, Dalhousie University, 1988. 8. Broecker, W.S., Kaufman, A. and Trier, R.M., The residence time of thorium in surface sea water and its implications regarding the fate of reactive pollutants. Earth Planet. Sci. Lett., 1973, 20. 35-44.
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