Most work on colloid generation from bentonite [e.g. 127, 128] has focused on bentonite as a source of colloids in the geosphere due to erosion at the bentonite-host rock interface, a topic which ...
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The size and shape of colloids released from a natural bentonite into a low-mineralized groundwater are investigated using various colloid characterization …
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Ghiasi et al. (2020a) studied the impact of colloid concentration, flow velocity, and sand gradation on co-transport of Cr(VI) and bentonite colloids.
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Bentonite colloid with different concentrations was prepared according to the mass ratios of bentonite to water of 0 %, 1 %, 3 %, 5 % and 7 %, respectively. ... liquid. At the same time, the rotor was subjected to greater shear stress, resulting in a gradual increase in viscosity test values. When the content of bentonite was low, the apparent ...
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Cationic surfactants are strongly coagulating agents for clay mineral dispersions. The critical coagulation concentration of cetyltrimethylammonium chloride (CTMAC) is 0.09 mEql–1 for a 0.025% sodium montmorillonite dispersion and increases to 0.35 mEql–1 for a 0.5% dispersion. The very low concentrations are caused by the strong adsorption of the …
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The deposited colloid aggregates could be redistributed and released when the solution chemistry became favorable towards dispersion. These findings provide essential insight into the environmental colloid fate as well as a vital reference for the risk of colloid-driven transport of contaminants in the subsurface aquifer environment.
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Bentonite fining trials determine the lowest bentonite addition needed to protein (heat) stabilize a wine. The colloid stability test is used to ensure the addition of a tartrate inhibitor, for cold stability purposes, does not create a haze at the various bentonite addition rates.Wines should be previously checked for protein (heat) stability before …
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Both the natural and bentonite colloid populations in the GGW measured by LIBD showed no significant changes in either concentration or average size over the course of the experiments [10,11,13]. ... Analytical results indicate that under the conditions present in the test shear zone, both natural and bentonite colloids influence the transport ...
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Abstract. An in-situ procedure for evaluating the quality of soil and soil/bentonite admix liners is described. The methylene blue () test is based on the principle that cationic dyes base exchange in proportion to the clay content in soils or clay slurries. The number of exchangeable ions present is determined by replacing these ions with methylene …
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Lack of an osmotic phase is evident in the free swell of calcium-bentonites (i.e., bentonites where the exchange sites are occupied by Ca 2ϩ cations), which typically is about 3 mL/2 g even when ...
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Considering the colloid generation data obtained in the static experiments with the bentonite compacted to 1.6 g/cm 3, the maximum value at equilibrium of …
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The primary minimum interaction was found to contribute more to irreversible colloid retention in a Ca 2+ system, while the secondary energy minimum was found to …
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DOI: 10.1016/j.nucana.2023.100048 Corpus ID: 256657648; Interaction between Gaomiaozi bentonite colloid and uranium @article{Zhu2023InteractionBG, title={Interaction between Gaomiaozi bentonite colloid and uranium}, author={Shan Zhu and Zhaomin Tan and Xin Wei and Qiang Tian and Zhichao Zhu and Fang Yang and …
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Their retention and consequent release pose a great challenge to the soil-groundwater environment. Some papers reported colloid facilitated the migration of heavy metals (Baumann et al., 2006;Gao ...
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In Sweden and in many other countries, a bentonite barrier will be used in the repository for spent nuclear fuel. In the event of canister failure, colloidal diffusion is a potential, but scarcely studied mechanism of radionuclide migration through the bentonite barrier. Column and in situ experiments are vital in understanding colloid diffusion and …
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Highlights Colloids may affect radionuclide migration in a deep geological repository (DGR). Colloid formation from the bentonite barrier of a DGR was investigated by novel tests. Salinity of the water and Ca concentration affect colloid formation and stability. A range of colloid generation rates under different chemical conditions was …
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Consumer preference for a totally clear, shining apple juice has made clarified apple juice much more popular than unclarified natural apple juice.
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In this study, we characterized the physical properties of bentonite colloids, conducted stability tests, and examined the effects of the colloids on the sorption of radionuclides in groundwater (Cs-137). The resulting data provides a valuable reference for safety assessments of final disposal sites for spent nuclear fuel and high-level radwaste. …
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: Co-transport of Cr(VI) with bentonite colloids (Bc) at different flow rate, pH, ion strength (IS), and colloid concentration in heterogeneous sand media was investigated. The results showed that obvious penetration of dissolved Cr(VI) in co-transport occurred at about 0.5PV, which was mainly due to the heterogeneity of the sand column. The …
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Colloids. Bentonite. The size and shape of colloids released from a natural bentonite into a low-mineralized groundwater are investigated using various colloid …
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The influence of smectite colloids on the migration behaviour of U(VI), Th(IV), Pu(IV), Am(III), Np(V), Sr(II) and Cs(I) is investigated within the Colloid and Radionuclide Retardation experiment (CRR). Two in situ experiments in a well-characterized granitic fracture zone are carried out in presence and absence of bentonite colloids.
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Mineral-rich and volcanic in origin, bentonite clay could be considered a panacea amidst the world's deluge of toxins. Chronic degenerative diseases and cancer are modern health epidemics. Here …
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3.1 Bentonite Colloid Fractionation. As described in the Methods section, the size of the particles was obtained through DLS at 25 ℃. It is obvious that colloid …
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Semantic Scholar extracted view of "Stability of bentonite colloid carried with kaolin-supported nanoscale zero-valent iron together as composite remediation materials and its adsorption property onto multi-heavy metals" by Yong He et al.
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Preparation of suspensions. Eu(III) stock solution was prepared from Eu 2 O 3 (purity, 99.99%), all Eu(III) solutions used in our transport experiments were diluted with deionized water. The bentonite used in this work obtained from Gaomiaozi region (Inner Mongolia, China) was transformed to Na type [], and then dispersed in deionized water …
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A colloid is a heterogeneous mixture in which the dispersed particles are intermediate in size between those of a solution and a suspension. The particles are spread evenly throughout the dispersion medium, which can be a solid, liquid, or gas. Because the dispersed particles of a colloid are not as large as those of a suspension, they do not ...
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You can test the humidity for effective compaction by squeezing a sample of the mixture in your hand. If the sample just retains its shape when opening your hand, it is good for compaction. ... with some good reviews is Soilfloc® which is a polymer pond sealer reported to be substantially cheaper than sodium bentonite. Our relative price ...
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Experiments have shown that an inferior bentonite mud forms a strong colloid with poor rheological properties at 150 °C (the so-called colloid high-temperature curing), which may prevent carrying out the drilling. ... The price of SNV32 at the concentration of 0.35% is much lower than that of HSB, and the use of SNV is very …
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A geological repository for high-level radioactive waste (HLWR) consists on a multi-barrier system, emplaced hundred meters deep in a geological medium. In most of the repository concepts, the waste would be located in metal canisters surrounded by a layer of compacted clay, i.e. bentonite. To guarantee the long-term safety of a …
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Southern Bentonite (calcium bentonite) is not available at Bracker's, but can be found at some metal casting foundry suppliers. Bentonite is a very fine-grained (colloidal) clay of the montmorillonite type containing bases and iron, derived from volcanic ash. The particle size is probably under 0.03% of the average kaolinite grain.
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