Analysis of Ba2+(aq) in the presence of BaSO4(s)

Meeks, F. R.; Meal, Larie

doi:10.1021/ed045p542

Cited by 1 publication

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“…The separated water after centrifuging was collected and used to prepare the BaCl 2 aqueous solution to examine the effect of Na + and Cl − on the size of BaSO 4 . The residual Ba 2+ content was measured by using the method reported by Meeks et al 30 Briefly, about 10 drops of diethylamine were added to 20 mL of the separated water to adjust the pH of the water to approximately 11.5, and methylthymol blue was added as an indicator. The separated water was then titrated with a standard EDTA solution.…”

Section: Methodsmentioning

confidence: 99%

Preparation of Barium Sulfate Nanoparticles in an Interdigital Channel Configuration Micromixer SIMM-V2

Wang

Zeng

et al. 2013

Ind. Eng. Chem. Res.

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BaSO 4 nanoparticles were synthesized by precipitation of Na 2 SO 4 and BaCl 2 at their concentrations close to their saturation concentrations in a commercially available micromixer, SIMM-V2. The particle size of BaSO 4 was dependent on the flow rate at the saturation concentrations, exhibiting a Z-type change with increasing the flow rate. The average particle size of BaSO 4 particles could be adjusted by decreasing the Na 2 SO 4 concentration. Decreasing the molar ratio R to less than 1 resulted in agglomerated round BaSO 4 particles, while dispersible rod-like ones were produced when R = 1.2−1.8. The wastewater separated from each synthesis solution could be reused to prepare the BaCl 2 solution, resulting in a slight increase in the mean particle size and broadened particle size distribution after eight cycles. The optimized preparation process could produce 2 kg/h of BaSO 4 nanoparticles with a mean particle size of 28 nm with a narrow particle size distribution.

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Section: Methodsmentioning

confidence: 99%