Separation strontium

The cation exchange resin AG MP-50 (BioRad Laboratories) was used for one run, 33-1-9, in anticipation of a greater separation factor for the yttrium-strontium separation. However, the column retained strontium, only slowly releasing it in 6 -12 M HC1. A possible explanation is that strontium ions are adsorbed on the resin inside the large resin pores. When strong acid is passed over the resin, the pores contract, trapping the strontium ions within them. Because of the slow elution of strontium from this resin, AG MP-50 will not be used in the future for strontium purification. 

Law, J.D., Garn, T.G., Herbst, R.S. et al. 2006. Development of cesium and strontium separation and immobilization technologies in support of an advanced nuclear fuel cycle. WM 06 Conf, February 26 to March 2, Tucson, AZ. INL/CON-05-00970. 

R2 = net count rate in c/s after lengthy interval (typically, about, 18 days) Rj = net count rate in c/s promptly after strontium separation A = activity of radio-strontium in Bq at time of measurement D2 = ingrowth fraction of90Y after lengthy interval (0.996 after 21 days) ... 

Dj = ingrowth fraction of 90Y promptly after strontium separation (about... 

Sketch, in semilog coordinates, a net count rate vs. time curve (for a 3-week period) for a sample immediately after strontium separation in which only 90Sr is present. Also prepare a curve for a sample with only 89 Sr. Finally, prepare a curve in which 89Sr and 90Sr are present in equal activity concentrations at the time of counting. 

Strontium separation using Eichrom M Sr-spec column... 

Eabiani, C., Strontium separation with ultrafiltration membrane from dilute aqueous solutio, Sep. Sci. Tech., 214, 353, 1986. 

The finishing stages for strontium separation are shown in Fig. 4. The main separation of the rare earths from the alkaline earths is made by ammonia gas precipitation of the rare earths as hydroxides in a carbonate-free medium. The alkaline earths pass into the filtrate and are removed in the next step as the carbonates. Since the separation of rare earth hydroxides and the only moderately soluble alkaline earth hydroxides is not clean, a re-precipitation step is required. The alkaline carbonates are then passed to packaging, either as the dried carbonates, or are first converted to sulfates, oxides, or fluorides for subsequent packaging in multiple-walled, weld-sealed, containers for storage. The... 

Determination of Sr together with the long-lived Sr (see Section 6.4.1) is a widespread analytical endeavor for radiation protection because of the similarity of strontium to calcium in their absorption into bone mass. Strontium separation is performed as described in Section 6.4.1 whether or not Sr is in the sample. The distinction between treating a sample that is known to have no Sr and one... 

Raut, D.R., Mohapatra, P.K., Manchanda, V.K., A highly efficient supported liquid membrane system for selective strontium separation leading to radioactive waste remediation, J. Membr. Sci. 390-391, 76, 2012. 

R. Rodriguez, J. Avivar, L. Ferrer, L.O. Leal, V. Cerda, Automated total and radioactive strontium separation and pre-concentration in samples of environmental interest exploiting a lab-on-valve system, Talanta 96 (2012) 96-101. 

The product stream from the kilns is collected in storage bins. Black ash from the bins is fine-ground in a ball mill and fed to a leacher circuit, which is a system of stirred tanks, where it is dissolved in water and the muds are separated by countercurrent decantation. The solution from the decantation is passed through filter presses the muds are washed, centrifuged, and discarded. The filtered product, a saturated solution containing 12—13 wt % strontium sulfide, is sent to an agitation tank where soda ash is added to cause precipitation of strontium carbonate crystals ... 

After precipitation is complete, the slurry is pumped to vacuum dmm filters where a nearly complete Hquid-soHds separation is accompHshed. The hquid is dilute sodium sulfide solution, which is concentrated by evaporation to a flaked 60 wt % sodium sulfide product. The filter cake is a 60 wt % strontium carbonate soHd which is fed to a carbonate dryer. After drying, the strontium carbonate product is cooled, ground, and screened for packaging. 

The properties of hydrated titanium dioxide as an ion-exchange (qv) medium have been widely studied (51—55). Separations include those of alkaH and alkaline-earth metals, zinc, copper, cobalt, cesium, strontium, and barium. The use of hydrated titanium dioxide to separate uranium from seawater and also for the treatment of radioactive wastes from nuclear-reactor installations has been proposed (56). 

The classical analytical method of deterruination of barium ion is gravimetric, by precipitating and weighing insoluble barium sulfate. Barium chromate, which is more insoluble than strontium chromate in a slightly acidic solution, gives a fairly good separation of the two elements. 

Alkaline-earth metals are often deterruined volumetricaHy by complexometric titration at pH 10, using Eriochrome Black T as indicator. The most suitable complexing titrant for barium ion is a solution of diethylenetriaminepentaacetic acid (DTPA). Other alkaline earths, if present, are simultaneously titrated, and in the favored analytical procedure calcium and strontium are deterruined separately by atomic absorption spectrophotometry, and their values subtracted from the total to obtain the barium value. 

The anode material in SOF(7s is a cermet (rnetal/cerarnic composite material) of 30 to 40 percent nickel in zirconia, and the cathode is lanthanum rnanganite doped with calcium oxide or strontium oxide. Both of these materials are porous and mixed ionic/electronic conductors. The bipolar separator typically is doped lanthanum chromite, but a metal can be used in cells operating below 1073 K (1472°F). The bipolar plate materials are dense and electronically conductive. 

The chemical identities of the fission products determine their subsequent redistribution, those elements which are in the gaseous state at the temperature of the operation migrating to the cooler exterior of the fuel rods, and die less voltile elements undergoing incorporation in the fuel rod in solid solution. Thus caesium and iodine migrate to the gas fill which sunounds the fuel rod, and elements such as the rare earths and zirconium are accommodated in solid solution in UO2 without significant migration along the fuel rod radius. Strontium and barium oxidize to form separate islands which can be seen under the microscope. 

H. 8-Hydroxyquinaldine (XI). The reactions of 8-hydroxyquinaldine are, in general, similar to 8-hydroxyquinoline described under (C) above, but unlike the latter it does not produce an insoluble complex with aluminium. In acetic acid-acetate solution precipitates are formed with bismuth, cadmium, copper, iron(II) and iron(III), chromium, manganese, nickel, silver, zinc, titanium (Ti02 + ), molybdate, tungstate, and vanadate. The same ions are precipitated in ammoniacal solution with the exception of molybdate, tungstate, and vanadate, but with the addition of lead, calcium, strontium, and magnesium aluminium is not precipitated, but tartrate must be added to prevent the separation of aluminium hydroxide. 

Guogang J, Testa C, Desideri D, et al. 1998. Sequential separation and determination of plutonium, americium-241 and strontium-90 in soils and sediments. J Radioanal Nucl Chem 230(l-2) 21-27. 

---