Ionic Interactions of Calcium Sulfate Dihydrate in Aqueous Sodium Chloride Solutions: Solubilities, Densities, Viscosities, Electrical Conductivities, and Surface Tensions at 35 ∘C

Kumar, Arvind; Mohandas, V. P.; Sanghavi, Rahul J.; Ghosh, Pushpito K.

doi:10.1007/s10953-005-3053-0

Cited by 17 publications

(17 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gypsum solubility in saline solutions is strongly dependent on magnesium concentration due to the formation of a neutral species like MgSO 4 (0), which withdraws part of sulphate ions causing an increase of gypsum solubility (Marshall and Slusher, 1968). Kumar et al (2005) conjecture that the higher gypsum solubility in seawater than in pure water is due to the alteration of the solvent structure.…”

Section: Hydrochemistrymentioning

confidence: 99%

Human-induced hydrogeological changes and sinkholes in the coastal gypsum karst of Lesina Marina area (Foggia Province, Italy)

Fidelibus

Gutiérrez

Spilotro

2011

Engineering Geology

View full text Add to dashboard Cite

Section: Hydrochemistrymentioning

confidence: 99%

Human-induced hydrogeological changes and sinkholes in the coastal gypsum karst of Lesina Marina area (Foggia Province, Italy)

Fidelibus

Gutiérrez

Spilotro

2011

Engineering Geology

View full text Add to dashboard Cite

“…The solubility of gypsum in brines has been extensively studied in the past. − Freyer and Vogt and Marshall and Slusher have nicely compiled the data in detail on crystallization, phase stability, and solubility behavior of CaSO 4 ·2H 2 O in aqueous solution as well as in aqueous solutions of different electrolytes. Sensing the importance of such studies, we have also initiated a research program on the aqueous electrolyte solutions saturated with CaSO 4 ·2H 2 O and reported a number of physicochemical properties for the ternary systems (CaSO 4 ·2H 2 O + NaCl + H 2 O and CaSO 4 ·2H 2 O + CaCl 2 + H 2 O) − and quaternary systems (CaSO 4 ·2H 2 O + NaCl + CaCl 2 + H 2 O and CaSO 4 ·2H 2 O + NaCl + MgCl 2 + H 2 O) , in the past few years. The effect of pH on the solubility of CaSO 4 ·2H 2 O in the system CaSO 4 ·2H 2 O + NaCl + H 2 O has also been examined by our research group …”

Section: Introductionmentioning

confidence: 99%

Effect of Organic Additives on the Solubility Behavior and Morphology of Calcium Sulfate Dihydrate (Gypsum) in the Aqueous Sodium Chloride System and Physicochemical Solution Properties at 35 °C

2013

Self Cite

View full text Add to dashboard Cite

The effect of the addition of organic solvents, such as ethyl acetate (EA), glycerol (GLY), isopropyl alcohol (IPA), dimethylformamide (DMF), oxalic acid (OA), and propylamine (PA), on the solubility behavior of calcium sulfate dihydrate (gypsum, CaSO 4 •2H 2 O) in aqueous NaCl solutions has been examined at 35 °C. Compared to organic solvent free system, the addition of EA slightly increased CaSO 4 •2H 2 O solubility, whereas only a little alteration in solubility was found with the addition of GLY. CaSO 4 •2H 2 O solubility decreased significantly and to nearly same extent with the addition of IPA or DMF. In the solutions containing PA or OA, CaSO 4 •2H 2 O dissolution was very limited probably due to precipitation of highly stable Ca salts of these organic solvents. Except OA, where no solubility maximum was observed, the addition of organic solvents did not shift the solubility maximum of CaSO 4 •2H 2 O as a function of NaCl concentration in solution, and the solubility pattern remained similar. Accurate data on density (ρ) and speed of sound (u) data have been recorded for the quaternary systems (CaSO 4 •2H 2 O + NaCl + H 2 O + organic solvent) at 35 °C. Measurements of u and ρ have been used to determine the solution isentropic compressibility (κ S ). Empirical equations describing the solubility, density, speed of sound, and isentropic compressibility in these systems are presented. The morphology of CaSO 4 •2H 2 O recrystallized from different aqueous−organic solvent solutions and aqueous-NaCl-organic solvent solutions has also been examined from scanning electron microscopy (SEM).

show abstract

“…Figure 5 depicts the effect of temperature and ionic strength on the surface tension of water. The ionic strength–surface tension relation is the result of an experiment conducted at 35°C using a CaSO 4 and NaCl solution (Kumar et al, 2005). This figure illustrates that the effect of ionic strength within the range 0 to 1.6 mol kg −1 on surface tension is negligible and considerably smaller than the effect of temperature in the range 0 to 40°C.…”

Section: Resultsmentioning

confidence: 99%

“…Effect of temperature and ionic strength (measured at 35°C using a CaSO 4 and NaCl solution) on the surface tension of water (ionic strength data from Kumar et al, 2005). …”

Section: Resultsmentioning

confidence: 99%

Design and Testing of a Drop Counter for Use in Vadose Zone Water Samplers

Mertens

Tuts

Diels

et al. 2008

Vadose Zone Journal

View full text Add to dashboard Cite

Measuring leachate mobility in the vadose zone is necessary to understand the processes controlling groundwater and river contamination, and requires recording leachate volumes with time. Many field studies manually measure the volume of leachate with a daily, weekly, or even biweekly resolution; however, measurement of leachate at higher temporal resolution is needed for the calibration of solute transport models and is useful in identifying the contribution of preferential flow to solute transport. We designed a simple, robust, and low‐cost drop counter for measuring leachate volumes at a high temporal resolution. Laboratory experiments showed a nearly perfect linear relationship between the applied flux and the number of drops per unit time, and indicate an average drop size of 35 μL. Due to manual manufacturing, variability between drop counters is not negligible and a one‐point calibration is necessary. The drop counter consists of an upper (guiding) tube from which a drop forms and a lower (capillary) tube that “sucks” the drop down before it falls. The presence of the lower tube makes the counter less vulnerable to temperature and ionic strength effects of the leachate. Counting of the drops can be easily achieved using any type of datalogger capable of logging electrical pulses.

show abstract

Ionic Interactions of Calcium Sulfate Dihydrate in Aqueous Sodium Chloride Solutions: Solubilities, Densities, Viscosities, Electrical Conductivities, and Surface Tensions at 35 ∘C

Cited by 17 publications

References 10 publications

Human-induced hydrogeological changes and sinkholes in the coastal gypsum karst of Lesina Marina area (Foggia Province, Italy)

Human-induced hydrogeological changes and sinkholes in the coastal gypsum karst of Lesina Marina area (Foggia Province, Italy)

Effect of Organic Additives on the Solubility Behavior and Morphology of Calcium Sulfate Dihydrate (Gypsum) in the Aqueous Sodium Chloride System and Physicochemical Solution Properties at 35 °C

Design and Testing of a Drop Counter for Use in Vadose Zone Water Samplers

Contact Info

Product

Resources

About