The effect of additives on the co-crystallisation of calcium with barium sulphate

Hennessy, Alison; Graham, Gordon Michael

doi:10.1016/s0022-0248(01)02258-8

Cited by 35 publications

(42 citation statements)

References 2 publications

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“…In this way, the behaviour of calcium cations can be more rigorously determined and a mechanism for the observed behaviour proposed. This work is similar to that of Hennessey et al [14], but the conditions and methods used are substantially different. In particular, the supersaturation of the following experiments are much lower than that of reference [14] and several techniques are used for the first time to assess the effect of the calcium cations on the process of barium sulphate nucleation and crystallisation.…”

Section: Introductionmentioning

confidence: 60%

“…Graham et al [13] have suggested the effect of calcium is dependent on the organic additive type (phosphonate vs. carboxylate vs. sulphonate), while another study suggests that the presence of calcium cations can modify the surface activity [12] of additives causing them to be adsorbed to a greater extent and thereby having a greater effect. Hennessey et al [14] have quite recently looked at the effect of calcium at very high supersaturation. They concluded the presence of calcium cations increases the solubility of barium sulphate.…”

Section: Introductionmentioning

confidence: 99%

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The effect of calcium ions on the precipitation of barium sulphate 1: calcium ions in the absence of organic additives

Jones

Oliviera

Parkinson

et al. 2004

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

The effect of calcium ions on the precipitation of barium sulphate 1: calcium ions in the absence of organic additives

Jones

Oliviera

Parkinson

et al. 2004

Journal of Crystal Growth

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“…Solution chemistry, such as the presence of humic substances and other organic compounds, divalent cations other than Ba 2+ , and saturation state are also thought to influence crystal growth and morphology (e.g., Hennessy and Graham, 2002;Smith et al, 2004) and should be considered when studying barite precipitation in the continental setting. For example, spontaneous barite precipitation from solution can be prevented by the presence of humic substances or other organic compounds, which could be attributed to crystal-growth inhibition due to adsorption of organic compounds to the growing crystal surfaces (Smith et al, 2004).…”

Section: Precipitation Of Barite In a Continental Settingmentioning

confidence: 99%

Controls on stable Sr-isotope fractionation in continental barite

et al. 2015

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Barite precipitation typically occurs when barium rich fluids mix with sulfate rich fluids, however barite found in the modern continental environment suggests that biological activity can play an important role in barite formation by oxidizing sulfur and/or concentrating barium within microenvironments. These activities induce barite precipitation, and carry with them implications for studies of barite genesis. Strontium (Sr) is incorporated into the barite crystal structure during barite formation preserving a radiogenic and stable Sr-isotope signature in barite, providing information about its formation. Here we present Sr-isotope results from three artesian sulfidic springs with ongoing barite precipitation (Zodletone Spring, Oklahoma; Stinking Spring, Utah; and Doughty Springs, Colorado) to explore the controls on stable Sr-isotope fractionation during barite precipitation in a continental setting. Apparent stable Sr-isotope fractionation for all three sites ranged from −0.6‰ to~0.0‰ similar to previously published calculated values for equilibrium conditions and measured values of synthetic barite. However, clear relationships do not exist between water and barite chemistry in the natural systems, indicating that barite does not precipitate directly from solution, but heterogeneously within diverse microenvironments created by microbial biomass or on sediment surfaces. The dynamic microenvironments in a continental setting influence the apparent stable Sr-isotope fractionation during barite precipitation because of changing saturation conditions, Sr concentration and/or precipitation of different mineral phases (e.g., celestine). In order to better understand the geochemistry of barite deposits, future work is necessary to study the controls on radiogenic and stable Sr-isotope signatures of barite in the context of the temporally and spatially dynamic nature of the continental setting.

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“…However, Ca can also be incorporated in trace amounts within other minerals, substituting for the major cation(s). For example, the mineral barite (BaSO 4 ) can support up to 6% substitution of Ca 2+ for Ba 2+ in its crystal lattice (Hennessy and Graham, 2002), although natural barite samples typically contain much lower Ca concentrations ($400 ppm; Averyt and Paytan, 2003). Trace element incorporation into a solid is influenced by many parameters, including the ionic strength and trace element concentration of the solution, competing complexation reactions, precipitation or growth rate, temperature, pressure, and saturation state (e.g.…”

Section: Introductionmentioning

confidence: 99%