By Daniel Grolimund, Kurt Barmettler, Michal Borkovec (auth.), Prof. Dr. Dr. Habil. Fritz H. Frimmel, Dr. Frank Von Der Kammer, Prof. Dr. Hans-Curt Flemming (eds.)
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Additional resources for Colloidal Transport in Porous Media
The zeta potential of bentonite at the original pH value (pH 7) was about -39 mV. The net zeta potential remained negative at the investigated pH range (pH 2 to pH 12) and as expected became less negative with decreasing pH value. It is attractive to assume that with decreasing pH value the surface of bentonite was more protonated. Decrease in the negative zeta potential can be caused also through the release of Al3+ from the bentonite structure and following readsorption onto the exchange sites, especially at the low pH values.
The UV signal was measured at O = 254 nm. The UV detector allowed the detection of inorganic colloids by measure of light intensity attenuation through light scattering. For the detection of metals the column system was coupled with an inductively coupled plasma mass spectrometer (ICP-MS). For controlling the detector signal drift of the 2 Influence of Na-bentonite Colloids on the Transport of Heavy Metals 37 ICP-MS system an internal standard containing 20 µg/L Rh, In and Ir each was continuously mixed to the eluent between the UV detector outlet and the ICP-MS inlet.
These salts were dissolved in a solution of hydrochloric acid (c(HCl) = 10 mmol/L). The concentration of metals was set to 10 mmol/L. These metal stock solutions were used for the preparation of samples in all experiments. 2 Titration Experiments For the stability characterisation of Na-bentonite dispersions the titration experiments were done by means of a Zetasizer Nano ZS and an Autotitrator (MPT-2, Malvern Instruments). The titration was carried out in a plastic container, which was connected through capillary system and peristaltic pump with a folded capillary zeta potential cell (DTS 1060, Malvern Instruments).
Colloidal Transport in Porous Media by Daniel Grolimund, Kurt Barmettler, Michal Borkovec (auth.), Prof. Dr. Dr. Habil. Fritz H. Frimmel, Dr. Frank Von Der Kammer, Prof. Dr. Hans-Curt Flemming (eds.)