Barium partitioning

Guo J, Green TH (1989) Barium partitioning between alkali feldspar and silicate melts at high temperature and pressure. Contrib Mineral Petrol 102 328-335... 

Guo J, Green TH (1990) Experimental study of barium partitioning between phlogopite and sihcate liquid at upper-mantle pressure and temperature. Lithos 24 83-96 Harrison WJ, Wood BJ (1980) An experimental investigation of the partitioning of REE between garnet and liquid with reference to the role of defects. Contrib Mineral Petrol 72 145-155 Hart SR, Duim T (1993) Experimental cpx/melt partitioning of 24 trace elements. Contrib Mineral Petrol 113 1-8... 

Guo J. and Green T. H. (1990) Experimental study of barium partitioning between phlogopite and silicate liquid at upper-mantle pressure and temperature. Lithos 24, 83-96. 

Other elements are also uniquely partitioned into specific mantle mineral phases. Eor example, potassium, rubidium, and barium partition preferentially into phlogopite (Schmidt et al, 1999). Relative depletions in the abundances of these elements on primitive mantle normalized trace-element plots (see later sections) can therefore serve as evidence of residual phlogopite in the source region of basaltic rocks. Amphibole can also sequester potassium and barium, as well as... 

Chivas, A. R., P. De Deckker J. M. G. Shelley, 1983. Magnesium, strontium, and barium partitioning in nonmarine ostracode shells and their use in paleoenvironmental reconstructions — a preliminary study. In Maddocks, R. F. (ed.) Applications of Ostracoda. University of Houston, Geosciences Department, Houston 238-249. 

Environmental Fate. The partitioning of barium in environmental media is influenced by the specific form of the compound and such site-specific conditions as pH and cation exchange capacity (Bates 1988 Bodek et al. 1988 Bowen 1966 Kabata-Pendias and Pendias 1984 Lagas et al. 1984). Upon release to the environment, barium is most likely to partition to soils and sediments (Base et al. 

In general, the partition coefficient of Ca, Dca, between clinopyroxene and melt is in the range 1-4. Given a reasonable estimate of Dca, partition coefficients of other 2+ ions, particularly strontium, barium, and radium, into the M2-site should be calculated from ... 

A given trace element (e.g., barium, and to some extent beryllium in the sediments) partitions into mica and as mica is dissolved away with increasing depth and temperature, enters into the fluid only at greater depth, its flux at low temperature/pressure being small. 

For the equilibrium between barium chromate and dichromate, vide supra, chromic acid. I. Meschtschersky found that a litre of water dissolved 4-3 mgrms. at 100°. C. R. Fresenius said that at 0°, a litre of water dissolves 1-19 mgrms. The salt is less soluble after it has been ignited. E. Schweizer said that in that state a litre of water dissolves 0-62 mgrm. L. M. Henderson and F. C. Kracek pointed out that the solubilities of the alkaline earth chromates decrease as the at. wt. of the alkaline earth metal. Thus, at 15°, the solubilities of the anhydrous calcium, strontium and barium chromates are of the order 25,1-2, and 0-0033 grms. per litre respectively. The solubility of ladiom chromate seems to follow the rifle, and a separation of radium and barium can be effected by fractional precipitation as chromates. The partition factor for acidic soln. is about 15-5. 

Bunsen s experiments (1853) on the partition of oxygen between carbon monoxide and hydrogen, which he thought were incompatible with the law of mass action, were later shown to be vitiated by secondary effects, and the reaction is really in agreement with the law (see p. 289). Bunsen s assistant Debus, by precipitating a mixture of lime water and baryta water with carbonic acid, found that the calcium and barium carbonates were formed in simple ratios. ... 

Partition coefficients of rare-earth elements and barium between igneous matrix material and rock-forming-mineral phenocrysts—1, in Ahrens, L.H., ed.. Origin and Distribution of the Elements (Pergamon Press, New York) pp. 929. 

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