Strontium distributions

Brass, G. W. and Turekian. K. K. (1974). Strontium distribution in GEOSECS oceanic profiles. Earth Planet. Sci. Lett. 23,141-148. 

Comar, C.L., Lotz, W.E. and Boyd, G.A. 1952 Autoradiographic studies of calcium, phosphorus, and strontium distribution in the bones of the growing pig. American Journal of Anatomy 90 113-125. 

FIGURE 4.5 Strontium distribution ratios of DC18C6 (1) (10 1 M in NPHE) and CA16 (2) (ICE2 M in NPHE) as a function of the nitric acid concentration. 

The variation of strontium distribution ratios DSr from nitric acid solution was investigated as a function of the irradiation dose. In toluene DCH18C6 solution, DSl was minimally affected by radiolysis, but decreased with the absorbed dose in the other nonaromatic solvents (254). Nevertheless, the distribution ratios measured after radiolysis were higher than expected, given the remaining extractant concentration, indicating some contribution from the degradation products (e.g., after an irradiation of 0.84 MGy, 70% of the crown ether was destroyed in chloroform, while the distribution ratio exhibited a decrease of only 30%) (254). 

The depth distribution of the Sr/Ca ratios of the recrystallized calcites in these sediments was calculated from the Sr2+/Ca2+ concentrations in the pore waters and appropriate values of the strontium distribution coefficient as a function of temperature from 5-25°C, where... 

Figure 5, Strontium distribution in the lower part of the lithologic sequence including underclay, the Kinneman Creek lignite, and directly overlying clay and mudstone.

Robin M. J. L., Sudicky E. A., Gillham R. W., and Kachanoski R. G. (1991) Spatial variability of strontium distribution coefficients and their correlation with hydrauhc conductivity in the Canadian forces base bordon aquifer. Water Resour. Res. 27(10), 2619-2632. 

Strontium distributes relatively uniformly within the bone volume where it exchanges with calcium in hydroxyapatite (see Section 3.5.1), although small differences in the calcium and strontium distributions within bone have been reported. The Sr Ca concentration ratio in bone increases with age from approximately 0.3 mg strontium/g Ca at birth to a value of 0.5 in adults (Papworth and Vannart 1984 Tanaka et al. 1981). The Sr Ca ratio in bone also has been shown to vary with the bone type ratios in cortical bone were approximately 10-20% higher than in trabecular bone (Tanaka et al. 1981). 

Boivin G, Deloffre P, Perrat B, et al. 1996. Strontium distribution and interactions with bone mineral in monkey iliac bone after strontium salt (S 12911) administration. J Bone Miner Res 11(9) 1302-1311. 

Bunde RL, Rosentreter JJ, Liszewski MJ, et al. 1997. Effects of calcium and magnesium on strontium distribution coefficients. Environ Geol 32(3) 219-229. 

Jacobsen N, Alfheim I, Jonsen J. 1978. Nickel and strontium distribution in some mouse tissues passage through placenta and mammary glands. Res Commun Chem Pathol Pharmacol 20(3) 571-584. 

There have been several reports on studies of the determinations of the strontium (2, 4, 5, 6, 8, JO, 12,14,17, 19, 20, 23) and barium (7, 8, 9, 11,22) concentrations of sea >vater and the resulting calculated strontium/ chlorinity and barium/chlorinity ratios. The samples analyzed were from numerous geographical locations and depths, with the pretreatment and methods of analysis of the samples not always being similar. The majority of the reports concerning strontium distributions indicate a constant strontium/chlorinity ratio with respect to depth and geographical location within the limits of experimental error of the methods used. The range of the values for this ratio which have been reported most recently... 

Barium [7440-39-3] Ba, is a member of Group 2 (IIA) of the periodic table where it Hes between strontium and radium. Along with calcium and strontium, barium is classed as an alkaline earth metal, and is the densest of the three. Barium metal does not occur free in nature however, its compounds occur in small but widely distributed amounts in the earth s cmst, especially in igneous rocks, sandstone, and shale. The principal barium minerals are barytes [13462-86-7] (barium sulfate) and witherite [14941-39-0] (barium carbonate) which is also known as heavy spar. The latter mineral can be readily decomposed via calcination to form barium oxide [1304-28-5] BaO, which is the ore used commercially for the preparation of barium metal. 

Strontium molybdate (SrMo04) using laser light seattering (Sohnel etal., 1988). Bimodal distributions were observed and the presenee of agglomerates was eonfirmed by mieroseopy (Figure 6.16). 

Martin, A. 1969 Content and distribution of stable strontium and Ra in human skeletons from Wisconsin descendants 1957-1961. BritishJoumal ofRadiology 42 295-298. 

Runia, XT. 1987 Strontium and calcium distribution in plants effect on paleodietaiy studies. 

The sarcoplasmic reticulum (SR) was first identified as the major mobilizable intracellular store of Ca2+ in skeletal muscles through the work of S. Ebashi, W. Hasselbach and A. Weber (review in Ebashi 1991). Identification of the SR and its role in smooth muscle met some early difficulties, partly due to the destructive effects of osmium fixation. Eventually the SR of smooth muscle was also identified, quantitated and its spatial distribution, peripheral and central, determined (Somlyo et al 1971, Devine et al 1971). Strontium (Sr), used as an electron opaque analogue of Ca2+, permitted direct, electron microscopic visualization of divalent cation transport into the SR (Somlyo Somlyo 1971). 

Strontium compounds, 23 319-324 estimated distribution of, 23 3201 world production of, 23 319-320 Strontium cyanide, 8 197 Strontium ferrate (1 1), 5 598 Strontium fluoride, 23 323 Strontium fluoroborate tetrahydrate, 4 153 Strontium halides, 23 323 Strontium hexaferrite, 23 323 Strontium hydride, 13 613 Strontium hydroxide, 23 324 Strontium iodide, 23 323 Strontium-lead alloys, 14 779 Strontium minerals, 23 320 producers of, 23 319 Strontium nitrate, 23 319, 321, 323 Strontium oxide, 23 318, 324 Strontium peroxide, 18 396, 23 324 Strontium-silicon alloy, 22 520 Strontium sulfate, 23 322, 324 Strontium sulfide, 23 322 Strontium titanate... 

Vidal, P., Dosso, L., Bowden, P. Lameyre, J. (1979). Strontium isotope geochemistry in syenite-alkaline granite complexes. In Origin and Distribution of the Elements, ed. L. H. Ahrens, pp. 223-31. Oxford Pergamon. 

It may be noted that, since the distribution coefficient is smaller than unity, the solid phase becomes depleted in strontium relative to the concentration in the aqueous solution. The small value of D may be interpreted in terms of a high activity coefficient of strontium in the solid phase, /srco3 38. If the strontium were in equilibrium with strontianite, [Sr2+] 10 3-2 M, that is, its concentration would be more than six times larger than at saturation with Cao.996Sro.oo4C03(s). This is an illustration of the consequence of solid solution formation where with Xcaco3 /caC03 -1 ... 

Menzel, R.G., Heald, W.R., 1955, Distribution of potassium, rubidium, caesium, calcium and strontium within plants grown in nutrient solutions. Soil Sci. 78 (5) 287-293. 

Uranium, thorium, radium, and strontium spatial distribution within studied area turn out to be different 1) a relatively similar pictures of U, Th, and Ra distributions (Fig. 2 - 4), and 2) a clear difference of distribution for Sr (Fig. 5). The greatest features in the spatial distributions of U, Th, and Ra appear in the northern-western and southern-eastern parts of the region (see Fig. 2 - 4). 

The lonsiv ion exchange resins are extraction technologies used to separate radionuclides from alkaline wastewater in the presence of competing cations. These resins include lonsiv IE-910 and lonsiv IE-911, which are manufactured using a new class of crystalline silicotitanates (CSTs) invented by researchers from Sandia National Laboratory (SNL) and Texas A M University. CSTs demonstrate high distribution coefficients in acidic, neutral, and alkaline solutions with high concentrations of competitive ions such as sodium and potassium. The affinity of CSTs for strontium in neutral or alkaline wastes is also high. 

Black lamps A black lamp is a low-pressure mercury lamp whose envelope is covered with a phosphor such as strontium fluoroborate or barium disilicate. The type of phosphor determines the spectral distribution of the lamp output (Forbes et al., 1976). Figure 16.4 shows a typical spectral distribution for A < 500 nm from a black lamp as well as the solar... 

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