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| Determination of Trace SO42-,HPO42-,Li+,Na,K,Mg,Ca in High Pure Boric Acid by Matrix Pre-removal-Ion Chromatography |
| Received:August 13, 2011 Revised:October 08, 2011 |
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| DOI：10.3969/j.issn.2095-1035.2011.04.0014 |
| KeyWord:boric acid; trace element; ion chromatography(IC) |
| Author | Institution |
| LIBoping |
核工业北京地质研究院，北京 |
| CUI Jianyong |
核工业北京地质研究院，北京 |
| XU Jing |
核工业北京地质研究院，北京 |
| GUO Dongfa |
核工业北京地质研究院，北京 |
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| Abstract: |
| A new method for determination of trace amounts of SO42-, HPO42-, Li+, Na+，K+, Mg2+ and Ca2+ in high pure boric acid by matrix pre-removal-ion chromatography was studied in this paper. The elimination of boric acid matrix was achieved based on the principle of the following reaction: in a special air-tight device, boric acid reacts with methanol to form volatile trimethyl borate, and then the trimethyl borate reacts with liquid glycerin to form nonvolatile polyolbrate complex and in the meantime release some methanols. Trace amounts of SO42-,HPO42-, Li+, Na+, K+, Mg2+ and Ca2+ were dissolved by HNO3(5%) and determined using ion chromatography. The detection limit of each ion was: SO42-:100 ng/g, HPO42-:200 ng/g, Li+: 15 ng/g, Na+:20 ng/g, K+:30 ng/g, Mg2+:50 ng/g and Ca2+:50 ng/g. |
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