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Application of an ion-exchange and extraction chromatography for 226Ra determination in natural waters using HR-ICP-MS
https://repo.qst.go.jp/records/61349
https://repo.qst.go.jp/records/6134999c9faf1-3e37-478d-8dfa-1292cd186a06
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-05-29 | |||||
| タイトル | ||||||
| タイトル | Application of an ion-exchange and extraction chromatography for 226Ra determination in natural waters using HR-ICP-MS | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
トルマチョフ, セルゲイ
× トルマチョフ, セルゲイ× 内田, 滋夫× Ｔｏｌｍａｃｈｅｖ Ｓｅｒｇｅｉ× 内田 滋夫 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Radium-226 (226Ra, t1/2 = 1600 y) is naturally formed radioisotope belonging to the 238U decay series. Determination of 226Ra in the environmental samples is difficult due to its low concentration and the complexity of the environmental matrices, thus 226Ra preconcentration and selective extraction is required. We have developed the radiochemical procedure for 226Ra determination in natural waters based on the combination of an anion exchange and extraction chromatography. The Diphonix ion-exchange resin used for alkali earth cations (Ca2+, Sr2+, Mg2+, Ba2+ and Ra2+) extraction from natural water samples. Batch and column extraction experimental setups have been tested for 500 ml samples acidified to 0.06M HNO3. Column extraction showed higher uptake of the cations compare to that of the batch method. From 95 to 99% of Ba (used as a chemical analog of Ra) were retained and eluted with 3M HNO3 from the column, when maximum of 85% were extracted with batch experiment at the best experimental conditions tested (contact time and stirring speed). Next step, the Ba(Ra) separation from major of Ca, Mg and Sr have been carried out with cation-exchange resin using subsequent combination of HCl and HNO3 acids as the eluents. Hydrochloric acid of 2.5M and 4M were investigated to obtain optimal separation of Ba(Ra) from bulk of Ca, Mg and Sr. Finally, Ba-Ra separation has been performed using the Sr Spec extraction chromatographic resin. The performance of Ba-Ra separation was investigated using nitric acid of 1M, 2M, 3M and 4M as a sample loading-washing media. From 95.8 to 100.3% of 226Ra were observed in the effluent with only 8.2 - 12% of Ba in the Ra-fraction for 1M, 2M and 3M HNO3, and 26% of Ba were found in Ra-fraction when 4M HNO3 has been used. Overall 226Ra chemical recovery can be estimated >90%, and initial sample volume of 500 ml can be reduced to 2 - 3 ml resulting in 226Ra concentration factor of 200. As the concentration of 226Ra in surface and ground waters is generally in a range of 0.002 - 0.02 Bq l-1, the concentration of 0.4 - 4 Bq l-1 should be measured using the developed procedure. Due to high sensitivity and short time per analysis, high resolution ICP-MS (HR-ICP-MS) was selected a tool for 226Ra detection. Limit of detection for HR-ICP-MS instrument (ELEMENT1, Finnigan MAT, Germany) has been estimated to be 0.045 Bq l-1, that is sufficient for 226Ra detection in natural water samples after the selective extractions. Further details of the analytical procedure along with ICP-MS instrumental conditions for 226Ra determination are presented and discussed. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 第6回「環境放射能」研究会 | |||||
| 発表年月日 | ||||||
| 日付 | 2005-03-10 | |||||
| 日付タイプ | Issued | |||||
