Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis
In nuclear forensics the amount of Pb to be analyzed is usually in the order of several nanograms; that is >10-3 of ionization efficiency is required for mass spectrometry measurements. The traditional silica-gel-phosphoric acid loading technique is typically used to measure microgram amounts of...
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2014-03-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/id/1e95968f-d380-47ef-b604-9486f5f0a7ce |
| _version_ | 1811167510213427200 |
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| author | LIU Xue-mei TANG Lei FU Zhong-hua LONG Kai-ming |
| author_facet | LIU Xue-mei TANG Lei FU Zhong-hua LONG Kai-ming |
| author_sort | LIU Xue-mei |
| collection | DOAJ |
| description | In nuclear forensics the amount of Pb to be analyzed is usually in the order of several nanograms; that is >10-3 of ionization efficiency is required for mass spectrometry measurements. The traditional silica-gel-phosphoric acid loading technique is typically used to measure microgram amounts of Pb, and the ionization efficiency is in the order of 10-4-10-3. Although the boron-silica gel technique could increase the ionization efficiency to 10-3 or higher, it is also difficult to handle measurement conditions as the ion flow repeatedly increased and decay process in the ionization of Pb resulting in the ion emission instability. A new silica gel-perrhenic acid loading reagent method has been developed and exhibits a significant enhancement in the ionization efficiency of Pb. Compared with the boron-silica gel technique, the emission of Pb ions is very stable with this new technique. The measurement Relative Standard Deviation of 204Pb/206Pb, 207Pb/206Pb, 208Pb/206Pb was 0.4%, 0.2% and 0.1%, respectively from 1 ng of pb, which is an improvement over the precision with other silica gel techniques. The enhancement effect on the ion emission of Pb was compared with the silica gel-perrhenic acid and some other traditional silica gel techniques. The reagent amount of the silica gel was optimized to 0.5-3.0 μL and the ‘sandwich biscuit’ loading sequence was used. The ionization efficiency of the Pb reached 6.0×10-3-4.6×10-2 for 1100 ng Pb. The ionization efficiency was close to the boron-silica gel technique, whereas it was about ten times higher than the traditional silica gel-phosphoric acid technique. A stable ion current was obtained by use of the silica gel-perrhenic acid technique, and the measurement accuracy meets the requirements for region indicators on nuclear forensic analysis. |
| first_indexed | 2024-04-10T16:10:35Z |
| format | Article |
| id | doaj.art-8b42b9438f6e4fdd9c4fee3cfb231c46 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T16:10:35Z |
| publishDate | 2014-03-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-8b42b9438f6e4fdd9c4fee3cfb231c462023-02-10T01:00:47ZengScience Press, PR ChinaYankuang ceshi0254-53572014-03-01332178185ykcs-33-2-178Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope AnalysisLIU Xue-mei0TANG Lei1FU Zhong-hua2LONG Kai-ming3Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,ChinaInstitute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,ChinaInstitute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,ChinaInstitute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,ChinaIn nuclear forensics the amount of Pb to be analyzed is usually in the order of several nanograms; that is >10-3 of ionization efficiency is required for mass spectrometry measurements. The traditional silica-gel-phosphoric acid loading technique is typically used to measure microgram amounts of Pb, and the ionization efficiency is in the order of 10-4-10-3. Although the boron-silica gel technique could increase the ionization efficiency to 10-3 or higher, it is also difficult to handle measurement conditions as the ion flow repeatedly increased and decay process in the ionization of Pb resulting in the ion emission instability. A new silica gel-perrhenic acid loading reagent method has been developed and exhibits a significant enhancement in the ionization efficiency of Pb. Compared with the boron-silica gel technique, the emission of Pb ions is very stable with this new technique. The measurement Relative Standard Deviation of 204Pb/206Pb, 207Pb/206Pb, 208Pb/206Pb was 0.4%, 0.2% and 0.1%, respectively from 1 ng of pb, which is an improvement over the precision with other silica gel techniques. The enhancement effect on the ion emission of Pb was compared with the silica gel-perrhenic acid and some other traditional silica gel techniques. The reagent amount of the silica gel was optimized to 0.5-3.0 μL and the ‘sandwich biscuit’ loading sequence was used. The ionization efficiency of the Pb reached 6.0×10-3-4.6×10-2 for 1100 ng Pb. The ionization efficiency was close to the boron-silica gel technique, whereas it was about ten times higher than the traditional silica gel-phosphoric acid technique. A stable ion current was obtained by use of the silica gel-perrhenic acid technique, and the measurement accuracy meets the requirements for region indicators on nuclear forensic analysis.http://www.ykcs.ac.cn/en/article/id/1e95968f-d380-47ef-b604-9486f5f0a7cethermo ionization mass spectrometrynanogram leadlead isotopesilica gel-perrhenic acid emitterionization efficiency |
| spellingShingle | LIU Xue-mei TANG Lei FU Zhong-hua LONG Kai-ming Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis Yankuang ceshi thermo ionization mass spectrometry nanogram lead lead isotope silica gel-perrhenic acid emitter ionization efficiency |
| title | Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis |
| title_full | Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis |
| title_fullStr | Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis |
| title_full_unstemmed | Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis |
| title_short | Application of a New Silica Gel Ionization Intensifier on Nanogram Lead Isotope Analysis |
| title_sort | application of a new silica gel ionization intensifier on nanogram lead isotope analysis |
| topic | thermo ionization mass spectrometry nanogram lead lead isotope silica gel-perrhenic acid emitter ionization efficiency |
| url | http://www.ykcs.ac.cn/en/article/id/1e95968f-d380-47ef-b604-9486f5f0a7ce |
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