Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry
Graphite and clay mixed in pencil lead, with non-standard proportions will be read correctly by computer card reading equipment and identified by non-specialists. In this paper, a rapid and effective method based on atmospheric mass spectrometry utilizes quality evaluation for the pencil lead by the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2013-05-01
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| Series: | Yankuang ceshi |
| Subjects: | |
| Online Access: | http://www.ykcs.ac.cn/en/article/id/69f1ebf8-4176-4572-b50f-bb48d6febb8d |
| _version_ | 1811167444379631616 |
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| author | ZHOU Ya-fei LI Cao XIAO Sai-jin CHEN Huan-wen ZHANG Xing-lei |
| author_facet | ZHOU Ya-fei LI Cao XIAO Sai-jin CHEN Huan-wen ZHANG Xing-lei |
| author_sort | ZHOU Ya-fei |
| collection | DOAJ |
| description | Graphite and clay mixed in pencil lead, with non-standard proportions will be read correctly by computer card reading equipment and identified by non-specialists. In this paper, a rapid and effective method based on atmospheric mass spectrometry utilizes quality evaluation for the pencil lead by the analysis of different degrees of blackness (graphite content) and hardness. At ambient pressure, with about 40% relative humidity, pencil lead was directly used as an ionization device to produce coronal discharge and impact the mass spectrum signals in air at high voltage. Here, experimental conditions were optimized, the relationship between the graphite content in pencil leads (e.g. 4B, 3B, 2B, HB, H and 2H) and their mass spectrum signals were analyzed, and six kinds of pencil leads were discriminated by principal component analysis (PCA). The results showed that the discharge behaviors of the different types of pencil lead have an influence on the signal intensity, which increases with the increasing graphite content in pencil lead. On the basis of the mass spectra raw data, six kinds of pencil lead were correctly identified to more than 99%. The method is available with a good reproducibility and straightforward operation, providing a rapid tool for the quality evaluation for commercially available pencil lead. |
| first_indexed | 2024-04-10T16:10:32Z |
| format | Article |
| id | doaj.art-7f41a15a806845df942a2958b7a3d7fe |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T16:10:32Z |
| publishDate | 2013-05-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-7f41a15a806845df942a2958b7a3d7fe2023-02-10T01:43:43ZengScience Press, PR ChinaYankuang ceshi0254-53572013-05-01323409414ykcs-32-3-409Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass SpectrometryZHOU Ya-fei0LI Cao1XIAO Sai-jin2CHEN Huan-wen3ZHANG Xing-lei4Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, ChinaJiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, ChinaJiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, ChinaJiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, ChinaJiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China Institute of Technology, Nanchang 330013, ChinaGraphite and clay mixed in pencil lead, with non-standard proportions will be read correctly by computer card reading equipment and identified by non-specialists. In this paper, a rapid and effective method based on atmospheric mass spectrometry utilizes quality evaluation for the pencil lead by the analysis of different degrees of blackness (graphite content) and hardness. At ambient pressure, with about 40% relative humidity, pencil lead was directly used as an ionization device to produce coronal discharge and impact the mass spectrum signals in air at high voltage. Here, experimental conditions were optimized, the relationship between the graphite content in pencil leads (e.g. 4B, 3B, 2B, HB, H and 2H) and their mass spectrum signals were analyzed, and six kinds of pencil leads were discriminated by principal component analysis (PCA). The results showed that the discharge behaviors of the different types of pencil lead have an influence on the signal intensity, which increases with the increasing graphite content in pencil lead. On the basis of the mass spectra raw data, six kinds of pencil lead were correctly identified to more than 99%. The method is available with a good reproducibility and straightforward operation, providing a rapid tool for the quality evaluation for commercially available pencil lead.http://www.ykcs.ac.cn/en/article/id/69f1ebf8-4176-4572-b50f-bb48d6febb8dpencil leadprincipal component analysismass spectrometrydischarge behavior |
| spellingShingle | ZHOU Ya-fei LI Cao XIAO Sai-jin CHEN Huan-wen ZHANG Xing-lei Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry Yankuang ceshi pencil lead principal component analysis mass spectrometry discharge behavior |
| title | Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry |
| title_full | Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry |
| title_fullStr | Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry |
| title_full_unstemmed | Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry |
| title_short | Study on Discharge Behavior of Pencil Lead at Ambient Pressure by Mass Spectrometry |
| title_sort | study on discharge behavior of pencil lead at ambient pressure by mass spectrometry |
| topic | pencil lead principal component analysis mass spectrometry discharge behavior |
| url | http://www.ykcs.ac.cn/en/article/id/69f1ebf8-4176-4572-b50f-bb48d6febb8d |
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