Improved method for the separation of radioactive strontium from various samples by mixed solvent anion exchange

Abstract

Procedures tbr the separation and determination of 9~ in liquid samples, with cation and anion exchangers have been described. Strontium, yttrium and other cations bind to the cation exchanger and are eluted from the column by means of nitric acid. Separation of yttrium and strontium from other cations is carried out on columns filled with strong base anion exchangers in nitrate form with alcoholic solutions of nitric acid. This separation method enables the determination of 9~ through yttrium on a low-level gas flow c~, 13-counter, as well as through strontium on a lowlevel liquid scintillation counter by means of Cherenkov counting. Such procedures have been tested by the determination of 9~ in water, wine, medium radioactive liquid waste samples, milk and clover samples. For comparison, the determination has also been carried out by the standard method. It has been showed that the developed procedures might produce a high efficiency in strontium separation and a satisfactory accuracy of determination.

Study on the removal of interferences for the determination of ⁸⁷Sr/⁸⁶Sr isotopic ratio in petroleum drill-hole water samples using isotope dilution – inductively coupled plasma mass spectrometry (ID – ICP-MS)

“…The recovery of strontium in all cases was about 98%. This result is similar to other study with different anion exchangers [13,14,17].…”

“…Previous report in literature [17] showed that the distribution constant of calcium on anionic exchanger much lower than that of strontium in alcoholic medium. Several cations can adsorb on strong base anion exchange resins, which contain the quaternary ammonium group with nitrate as counter-ion from solutions of nitric acid in alcohol [14] and the order of adsorption of these cations depends on the distribution coefficients [13,14]. The phenomenon of adsorbed cations on anionic exchangers can only be obtained in solutions with highly polarized alcohol [17].…”

“…There exists several resolutions to correct the signal value for these two isotopes by using 85 Rb and 88 Sr [10,11] but the complete removal of Rb from Sr in analyzed sample is preferable with the use of ion-exchange chromatography [1,3,7,[9][10][11][12]. In case of sample containing thick matrix due to high concentration of calcium and other alkaline earth elements such as rock or soil, it is necessary to remove these interfered major elements before the separation of strontium and rubidium [7,[10][11][12][13][14][15][16][17]. The removal of calcium from sample matrices, especially from seawater was carried out with variety of reagents using solvent extraction or fractional precipitation or ion exchange [6,8,[15][16][17].…”

“…The removal of calcium from sample matrices, especially from seawater was carried out with variety of reagents using solvent extraction or fractional precipitation or ion exchange [6,8,[15][16][17]. Among them, the ion exchange technique was recently more applicable to separate calcium from different sample matrices [13][14][15][16][17] with high recovery of strontium. Since calcium and strontium are adjacent elements in alkaline earth group with similar physical and chemical properties, the quantitative separation of each other is rather difficult even using ion exchange technique, except for the use of special resin to separate 90 Sr trace from seawater [18].…”

A Rapid Method for Measuring Strontium-90 Activity in Crops in China

“…A lot of work has been done to find simpler, faster and more accurate methods. Nowadays, extraction chromatographic resin has been developed for isolation of radionuclides from various kinds of matrix [10][11][12][13]. In China, the conventional EC method for analyzing strontium-90 in crops is based on the GB11222.1 − 89 [14] which uses ion-exchange resin with di (2-ethylhexyl) phosphoric acid (HEDHP) to isolate Y-90, counting Y-90 with lowbackground proportional counter, and then the radioactivity of Sr-90 can be evaluated.…”