Browse > Article

A Study on the Stability of the Ca-Bentonite Colloids Using a Dynamic Light Scattering Method  

Baik Min-Hoon (Korea Atomic Energy Research Institute)
Park Jong-Hoon (R&D Department, HANS)
Cho Won-Jin (Korea Atomic Energy Research Institute)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.3, 2006 , pp. 12-19 More about this Journal
Abstract
In this study, the stability of Ca-bentonite colloids from Gyeongju area was studied by investigating the changes in the size of the bentonite colloids using a dynamic light scattering method depending on the geochemical conditions such as pH and ionic strength. Kinetic and equilibrium coagulation behavior of the bentonite colloids was investigated by changing the pH and ionic strength of the bentonite suspensions. The results showed that the stability of the bentonite colloids strongly depended upon contact time, pH, and ionic strength. It was also shown that the bentonite colloids were unstable at higher ionic strength greater than 0.01 M $NaClO_4$ at whole pH values considered. In addition, the stability ratio Wand the critical coagulation concentration (CCC) were also calculated using the data from the kinetic coagulation experiments. The stability ratio W was decreased as the ionic strength increased and varied with pH depending on the ionic strength. The CCC of the Ca-bentonite colloids was about 0.05 M $NaClO_4$ around pH 7.
Keywords
Ca-bentonite colloids; Dynamic light scattering; Kinetic coagulation; Stability ratio; Critical coagulation concentration;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Bitea, C., Walther, C., Kim, J.I., Geckeis, H., Rabung, Th., Scherbaum, F.J., and Cacuci, D.G, Time-resolved observation of $ZrO_2$-colloid agglomeration, 2003, Colloids and Surfaces A, 215, 55-60   DOI   ScienceOn
2 Chen, J.S., Cushman, J.H., and Low, P.F., 1990, Rheological behavior of Na-montrnorillonite suspensions at low electrolyte concentration, Clays Clay Miner., 38(1), 57-62   DOI
3 Holthoff, H., Egelhaaf, S.U., Borkovec, M., Schurtenberger, P., and Sticher, H., 1996, Coagulation rate measurements of colloidal particles by simultaneous static and dynamic light scattering, Langmuir, 12, 5541-5549   DOI   ScienceOn
4 Kretzschmar, R., Holthoff, H., and Sticher, H., 1998, Influence of pH and humic avid on coagulation kinetics of kaolinite: A dynamic light scattering study, J. Call. Interf. Sci., 202, 95-103   DOI   ScienceOn
5 Lagaly, G, Ziesmer, S., 2003, Colloid chemistry of clay minerals: the coagulation of montmorillonite dispersions, Adv. Colloid Interf. Sci., 100-102, 105-128
6 Missana. T. and Adell, A., 2000, On the applicability of DLVO theory to the predictin of clay colloids stability, J. Call. Interf. Sci., 230, 150-156   DOI   ScienceOn
7 Penrose, W.R., Polzer, W.L., Essington, E.H., Nelson, D.M., and Orlandini, K.A., 1990, Mobility of plutonium and americium through a shallow aquifer in a semiarid region, Environ. Sci. Technol., 24, 228-234   DOI
8 Tombacz, E., Szekeres, M., 2004, Colloidal behavior of aqueous montmorillonite suspensions: the specific role of pH in the presence of indifferent electrolytes, Appl. Clay Sci., 27, 75-94   DOI   ScienceOn
9 Ledin, A., Karlsson, S., Duker, A., and Allard, B., 1993, Applicability of photon correlation spectroscopy for measurement of concentration and size distribution of colloids in natural waters, Analytica Chimica Acta, 281, 421-428   DOI   ScienceOn
10 Mori, A., Alexander, W.R., Geckeis, H., Hauser, W., Schafer, T., Eikenberg, J., Fierz, Th., Degueldre, C., and Missana, T., 2003, The colloid and radionuclide retardation experiment at the Grimsel Test Site: influence of bentonite colloids on radionuelide migration in a fractured rock, Colloids and Surfaces A, 217, 33-47   DOI   ScienceOn
11 Pusch, R., 1999, Clay colloid formation and release from MX80 buffer, SKB Technical Report TR-99-31, Swedish Nuclear Fuel and Waste Waste Management Co., Stockholm, Sweden
12 Hesterberg, D. and Page, A.L., 1990, Critical coagulation concentration of sodium and potassium illite as affected by pH, Soil Sci. Soc. Am. J., 54, 735-739   DOI
13 Busenberg, E. and Clemency, C.V., 1973, Determination of the cation exchange capacity of clays and soils using an ammonia electrode, Clays Clay Miner, 21, 213-217   DOI
14 Heil, D. and Sposito, G., 1993, Organic matter role in illite soil colloids flocculation: I. Counter ions and pH, Soil Sci. Soc. Am. J., 57, 1241-1246   DOI   ScienceOn
15 조원진, 이재완, 강철형, 전관식, 1999, 고준위폐기물처분장 완충재용 국산 벤토나이트 및 벤토나이트-모래 혼합물의 물리화학적, 광물학적 및 역학적 특성, KAERI/TR-1388/99, 한국원자력연구소, 대전
16 Van Olphen, H., 1977, An Introduction to Clay Colloid Chemistry,2nd Ed., A Wiley Interscience Publisher, New York, p. 32
17 McDowell-Boyer, L.M., 1992, Chemical mobilization of micronsized particles in saturated porous media under steady flow conditions, Environ. Sci. Technol., 26(3), 586-593   DOI
18 Buddemeier, R.W. and Hunt, J.R., 1988, Transport of colloidal contaminants in groundwater: radionuclide migration at the Nevada Test Site, Appl. Geochem., 3, 535-548   DOI   ScienceOn
19 Frenkel, H., Fey, M.V., and Levy, G.J., 1992, Organic and inorganic anion effects on reference and soil clay critical flocculation concentration, Soil Sci. Soc. Am J., 56, 1762-1766   DOI   ScienceOn
20 Glasgow, L.A., 1989, Effects of the physicochemical environment on floc properties, Chem. Engr. Prog., 85(8), 51-55
21 Hsu, J.-P., Yu, H.-Y., Yseng, S., 2006, Critical coagulation concentration of a salt-free colloidal dispersion, J. Phys. Chem. B., 110, 7600-7604   DOI   ScienceOn
22 Smith, M.J. et al., 1980, Engineered barrier development for a nuclear waste repository in basalt: An integration of current knowledge, RHO-BWl-ST 7, Rockwell Hanford Operations
23 Kersting, A.B., Efurd, D.W., Finnegan, D.L., Rokop, D.J., Smith, D.K., and Thompson, J.L., 1999, Migration of plutonium in groundwater at the Nevada Test Site, Nature, 397, 56-59   DOI
24 Novich, B.E., and Ring, T.A., 1984, Colloid stability of clays using photon correlation spectroscopy, Clays Clay Miner., 32, 400-406   DOI
25 Tombacz, E., Filipcsei, G, Szekeres, M., and Gingl, Z., 1999, Particle aggregation in complex aquatic systems, Colloids and Surfaces A, 151, 233-244   DOI   ScienceOn
26 Virden, J.W. and Berg, J.C., 1992, The use of photon correlation spectroscopy for estimating the rate constant for doublet formation in an aggregating colloidal dispersion, J. Coll. Interf. Sci., 149(2), 528-535   DOI   ScienceOn
27 Missana, T., Alonso, U., and Turrero, M.J., 2003, Generation and stability of bentonite colloids at the bentonite/granite interface of a deep geological radioactive waste repository, J. Contam. Hydrol., 61, 17-31   DOI   ScienceOn
28 Grindrod, P., Peletie, M., and Takase, H., 1999, Mechanical interaction between swelling compacted clay and fractured rock, and the leaching of clay colloids, Eng. Geol., 54, 159-165   DOI   ScienceOn