Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid
BACKGROUND Os can be separated from the sample matrix by distillation, and the absorbing liquid can be introduced into ICP-MS directly, which is a key step of the molybdenite Re-Os isotopic age analysis. However, the Os signal intensity declines significantly after long time storage. According to th...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2018-07-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805010054 |
| _version_ | 1797953713970610176 |
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| author | ZHOU Li-min LI Chao LI Xin-wei ZHAO Hong QU Wen-jun DU An-dao |
| author_facet | ZHOU Li-min LI Chao LI Xin-wei ZHAO Hong QU Wen-jun DU An-dao |
| author_sort | ZHOU Li-min |
| collection | DOAJ |
| description | BACKGROUND Os can be separated from the sample matrix by distillation, and the absorbing liquid can be introduced into ICP-MS directly, which is a key step of the molybdenite Re-Os isotopic age analysis. However, the Os signal intensity declines significantly after long time storage. According to the properties of OsO4, the possible causes may include:1) volatilization which reduces the Os content in the absorbing liquid, and 2) the reduction in which Os(Ⅷ) transforms to the low valence state without volatility and OsO4 in the gas state decreases. Although they can both reduce the Os being introduced into ICP-MS ultimately, the extent of their effect is not clear. OBJECTIVES To quantify the effects of absorbing liquid storage conditions such as duration, acidity and temperature on the Os signal intensity, to identify the cause of this decline and to find out the methods for its suppression. METHODS:The experiment consists of two parts:1) using the molybdenite Re-Os dating reference materials to construct a different absorbing liquid storage condition series, including duration, acidity and temperature, and measure their Os signal intensities in terms of 187Os/193Ir relative ratios. 2) sealing the residual absorbing liquid together with the spike and oxidizing agents within the Carius tube with sequent heating and distillation. The 187Os/190Os ratios were determined to calculate the Os content and the retention rate. RESULTS After storing, the Os signal intensities of absorbing liquids decline with time from 3.2% to 68.6%. The longer time, the lower acidity and the higher temperature for OsO4 absorbing liquid storage, the more obvious Os signal declines. After storing at room temperature for the same time, the Os retention rate of the low-acidity series is higher than that of the high-acidity series, but the former has a lower signal intensity than the latter. This indicates that both volatilization and reduction contribute to the decline of Os signal intensity and are the main factors. CONCLUSIONS Freezing to -18℃ can inhibit the volatilization of OsO4, whereas increasing the acidity (about 3.5 mol/L) can reduce OsO4 reduction. The combination of the two inhibits signal attenuation, and increases the flexibility and applicability of the distillation method. |
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| id | doaj.art-2eff941b1e5043769cf7755cac985d1d |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T23:07:37Z |
| publishDate | 2018-07-01 |
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| series | Yankuang ceshi |
| spelling | doaj.art-2eff941b1e5043769cf7755cac985d1d2023-01-13T10:09:44ZengScience Press, PR ChinaYankuang ceshi0254-53572018-07-0137443143810.15898/j.cnki.11-2131/td.201805010054ykcs-37-4-431Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption LiquidZHOU Li-min0LI Chao1LI Xin-wei2ZHAO Hong3QU Wen-jun4DU An-dao5National Research Center for Geoanalysis, Beijing 100037, ChinaNational Research Center for Geoanalysis, Beijing 100037, ChinaNational Research Center for Geoanalysis, Beijing 100037, ChinaNational Research Center for Geoanalysis, Beijing 100037, ChinaNational Research Center for Geoanalysis, Beijing 100037, ChinaNational Research Center for Geoanalysis, Beijing 100037, ChinaBACKGROUND Os can be separated from the sample matrix by distillation, and the absorbing liquid can be introduced into ICP-MS directly, which is a key step of the molybdenite Re-Os isotopic age analysis. However, the Os signal intensity declines significantly after long time storage. According to the properties of OsO4, the possible causes may include:1) volatilization which reduces the Os content in the absorbing liquid, and 2) the reduction in which Os(Ⅷ) transforms to the low valence state without volatility and OsO4 in the gas state decreases. Although they can both reduce the Os being introduced into ICP-MS ultimately, the extent of their effect is not clear. OBJECTIVES To quantify the effects of absorbing liquid storage conditions such as duration, acidity and temperature on the Os signal intensity, to identify the cause of this decline and to find out the methods for its suppression. METHODS:The experiment consists of two parts:1) using the molybdenite Re-Os dating reference materials to construct a different absorbing liquid storage condition series, including duration, acidity and temperature, and measure their Os signal intensities in terms of 187Os/193Ir relative ratios. 2) sealing the residual absorbing liquid together with the spike and oxidizing agents within the Carius tube with sequent heating and distillation. The 187Os/190Os ratios were determined to calculate the Os content and the retention rate. RESULTS After storing, the Os signal intensities of absorbing liquids decline with time from 3.2% to 68.6%. The longer time, the lower acidity and the higher temperature for OsO4 absorbing liquid storage, the more obvious Os signal declines. After storing at room temperature for the same time, the Os retention rate of the low-acidity series is higher than that of the high-acidity series, but the former has a lower signal intensity than the latter. This indicates that both volatilization and reduction contribute to the decline of Os signal intensity and are the main factors. CONCLUSIONS Freezing to -18℃ can inhibit the volatilization of OsO4, whereas increasing the acidity (about 3.5 mol/L) can reduce OsO4 reduction. The combination of the two inhibits signal attenuation, and increases the flexibility and applicability of the distillation method.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805010054re-os isotopedistillationicp-msvolatilizationreduction |
| spellingShingle | ZHOU Li-min LI Chao LI Xin-wei ZHAO Hong QU Wen-jun DU An-dao Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid Yankuang ceshi re-os isotope distillation icp-ms volatilization reduction |
| title | Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid |
| title_full | Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid |
| title_fullStr | Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid |
| title_full_unstemmed | Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid |
| title_short | Study on the Causes for ICP-MS Signal Intensity Declination of Os Water Absorption Liquid |
| title_sort | study on the causes for icp ms signal intensity declination of os water absorption liquid |
| topic | re-os isotope distillation icp-ms volatilization reduction |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.201805010054 |
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