Colloid properties in granitic groundwater systems. II: Stability and transport study

Degueldre, C.; Grauer, R.; Laube, A.; Oess, A.; Silby, H.

doi:10.1016/s0883-2927(96)00035-2

Cited by 63 publications

(32 citation statements)

References 24 publications

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“…This may have maintained high levels of soluble Ca, thus enhancing coagulation of the colloids and reducing their mobility. The higher ionic strength of the eluted LSB suspensions compared to those of other colloids supports the potential negative influence of Ca as an inhibitor of colloid mobility (Degueldre et al, 1996).…”

Section: Colloid Elutionmentioning

confidence: 56%

“…The higher pH of the Maury and Woolper soils is expected to have an effect on colloid mobility, since colloid stability is enhanced at high pH values (Degueldre et al, 1996).…”

Section: Soil Propertiesmentioning

confidence: 99%

“…3a). It is possible that the smaller size of the PMB colloids enhanced physical attachment and entrapment (Kovenya et al, 1972;Degueldre et al, 1996;Roy and Dzombak, 1996). Other than an abrupt pH drop from 6.0 to 5.0 at the 17th pore volume, there were no drastic changes in the eluted suspension chemistry to explain this colloid elution pattern.…”

Section: Colloid Elutionmentioning

confidence: 99%

See 2 more Smart Citations

Stability and transportability of biosolid colloids through undisturbed soil monoliths

Karathanasis

Johnson

2006

Geoderma

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Section: Colloid Elutionmentioning

confidence: 56%

“…The higher pH of the Maury and Woolper soils is expected to have an effect on colloid mobility, since colloid stability is enhanced at high pH values (Degueldre et al, 1996).…”

Section: Soil Propertiesmentioning

confidence: 99%

Section: Colloid Elutionmentioning

confidence: 99%

See 1 more Smart Citation

Stability and transportability of biosolid colloids through undisturbed soil monoliths

Karathanasis

Johnson

2006

Geoderma

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“…Key factors that affect colloid stability are pH, redox potential, salt (Nay Ca) concentrations, the presence of dissolved organics, and the extent to which the system exists at steady state with respect to chemistry and flow (Degueldre, Grauer et al 1996;Degueldre, Pfeiffer et al 1996;O'Melia and Tiller 1993). For an aquifer in a steady-state situation, decreases of the concentration of alkali elements (Nay K) below M and of alkali-earth elements (Cay Mg) below lo4 M contribute to an increase in the colloid stability and concentration (Degueldre, Grauer et al 1996;Degueldre, Pfeiffer et al 1996). Mixing of waters of different compositions and large concentrations of organic carbon also contribute to an increase in colloid stability and concentration.…”

Section: Review Of Geochemical Controls On Colloid Stabilitymentioning

confidence: 99%

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Conca¹

2000

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“…During this period, the aggregation of the colloids in the size range considered should not be significant (the aggregation halftime has to be estimated for a colloid concentration of 1 ppm or 1 ppb and for attachment coefficients of the order of 10 −1 to 10 −3 (corresponding to the Ca, Mg, Na, and K concentration) and size 100 nm [14].…”

Section: Assessing the Colloid Datamentioning

confidence: 99%

Granitic groundwater colloids sampling and characterisation: the strategy for artefact elimination

Nilsson

Hedqvist²,

Degueldre

2008

Anal Bioanal Chem

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Colloids were separated by submicro-filtration of granitic groundwater samples collected at-line under in-situ thermodynamic conditions after down-hole groundwater sampling and transfer at the well head. The methodology avoids the generation of artefacts produced by pH changes due to CO 2 exchange, yielding potential carbonate precipitation, or by O 2 contamination yielding oxidized insoluble phases. The enhanced pressure and the anoxic conditions are also maintained through the filtering procedure. This procedure was carried out after a period of regular sampling of groundwater pumped to the ground surface and continuous on-line long-term measurements (weeks, months) of chemical and physical parameters in the unbroken sample water both at the ground surface and at depth down-hole. Colloid samples were characterized on the submicro-filtration membrane by scanning electron microscopy. Under deep granite groundwater conditions, natural colloids occur sparsely. The colloid concentration was determined C col ∼1 and ∼50 μg L −1 for sizes ranging from 50 to 200 nm or n col ∼3.9×10 9 and 47×10 9 L −1 for sizes larger than 50 nm for KFM11A, Forsmark, and KLX17A, Laxemar, Oskarshamn, respectively, Sweden. These colloids are expected to be clay particles with an average size smaller than 200 nm for the Na-Ca-Cl and NaCl groundwaters (pH 7.6 and 8.00, ionic strength ∼10 −1 and ∼10 −2 mol L −1 , respectively, for KFM11A and KLX17A), the colloid concentrations were comparable with values previously reported in the literature.

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Colloid properties in granitic groundwater systems. II: Stability and transport study

Cited by 63 publications

References 24 publications

Stability and transportability of biosolid colloids through undisturbed soil monoliths

Stability and transportability of biosolid colloids through undisturbed soil monoliths

Unsaturated Zone and Saturated Zone Transport Properties (U0100)

Granitic groundwater colloids sampling and characterisation: the strategy for artefact elimination

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