Both crystalline and sedimentary rocks are being considered as potential host rocks
for a deep geological repository in Canada. Deep-seated sedimentary rocks in the
Michigan Basin, Ontario, Canada contain highly saline ground and pore waters. The
relatively high I of these waters may influence speciation and rock matrix sorption
properties. To this end, laboratory sorption experiments were conducted to examine
sorption of Pd(II) on sodium bentonite, illite and Ordovician age shale as a function
of pH and solution I and initial concentration of Pd. Solutions with pH values in the
range of 5 to 9, I ranging from 0.1 to 4 M and initial concentration of Pd ranging
from 5×10 −8 to 1×10 −6 M were considered. A sorption time of 14 days was used and
the separation method was by centrifuge. Experiments were performed under aerobic
conditions at 25
◦ CC, and the Eh value of the solution ranged from 300 to 600 mV. The
data from sorption experiments were used to validate surface complexation models
developed in PHREEQC with the JAEA TDB. The sorption of Pd on bentonite,
shale and illite all showed strong dependence on I and pH. The dependence on initial
concentration of Pd was used to plot sorption isotherms. The slope of the isotherms
showed that Pd was forming inner- and outer- sphere complexes inside the stern layer
for sorption onto bentonite and illite. It also showed however that shale was most
likely undergoing cooperative sorption. Strong fit was found between the single layer
surface complexation model for montmorillonite (the major constituent clay mineral
of sodium bentonite) and experimental data, but not for illite (the major constituent
clay mineral of shale). / Thesis / Master of Applied Science (MASc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/20439 |
| Date | January 2016 |
| Creators | Riddoch, Justin |
| Contributors | Nagasaki, Shinya, Engineering Physics |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
| Type | Thesis |
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