PRECIPITATION SEPARATION OF STRONTIUM AND CALCIUM FROM ACIDIC SOLUTIONS USING CROWN-ETHER AND TUNGSTOSILICIC ACID

被引：10

作者：

MIKULAJ, V

SVEC, V

机构：

[1] Department of Nuclear Chemistry, Comenius University, Bratislava, 842 15

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES | 1994年 / 183卷 / 01期

关键词：

D O I：

10.1007/BF02043125

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Strontium forms a compound of composition (SrL)AA.nH2O with low solubility (5.0 . 10(-6) mol Sr . dm-3) in the presence of 18-crown-6 (L) and tungstosilicic acid (H4A) in acid media, as has been found by radiometric precipitation titration. Formation of the compound with limited solubility was used for separation of strontium and calcium from 1 mol. dm-3 HCl. It is possible to separate strontium in the range from trace to 6 mmol. dm-3 in the presence of calcium with its concentration up to 0.2 mol. dm-3 and the recovery determined was 95% of Sr and 5% Ca or 90% of Sr and 4% Ca, respectively. The ratio of Sr/Ca depends on the stability constants ratio of metal-L (beta(sr)/beta(ca)) in the case of gradual addition of L. Potassium up to the concentration of 0.05 mol . dm-3 does not influence recovery of strontium.

引用

页码：127 / 133

页数：7