Development of compact emission detection devices for the measurement of environmental pollutants using helium radio-frequency plasma
| Project/Area Number |
17510014
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
NAKAGAMA Tatsuro Tokyo Metropolitan University, Graduate School of Urban Environmental Sciences, Research associate (50244421)
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| Co-Investigator(Kenkyū-buntansha) |
UCHIYAMA Katsumi Tokyo Metropolitan University, Graduate School of Urban Environmental Sciences, Professor (40151899)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,860,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Atomic emission detection / Environmental pollutants / Gas chromatograph / Organic phosphorus compounds / Organic sulfur compounds / 有機塩素化合物 / 有機フッ素化合物 |
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| Research Abstract |
The purpose of this study was that the development of compact atomic emission detection (AED) devices capable of performing high-sensitive and high-selective detections for environmental pollutants because we paid attention to the easy generation of miniaturized and stable helium plasma by applying radio-wave (200-300kHz).
An AED device with high-sensitivity for some organic sulfur compounds was firstly developed. An avalanche photodiode (APD) module was used for the photometric system. Some typical atomic emissions (921-923nm)from sulfur were detected by the APD module after selecting by a suitable interference filter. The pg/sec sensitivity for sulfur was achieved as a GC detector by optimizing the inner diameter of electrodes and the distance between them, the applied power and frequency, and the flow rate of plasma gas etc.
Next, a smaller and power-saving AED device equipped with a coaxial double-tube type micro plasma torch was newly developed. The plasma was capable of being generated by using the AED device with below 1W of applied power and a few mL/min of plasma gas. When the AED device was equipped on a GC system, more highly sensitive detection of organic phosphorus and sulfur compounds was performed with a CCD spectrometer after the optimization of applied power and frequency, and the flow rate of plasma gas.
Furthermore, another AED device with a coaxial type micro plasma torch with face-to-face positioned electrode tubes was developed. 8pg/sec for sulfur and 12pg/sec for phosphorus as the detection limit were achieved, respectively.
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Report
(4 results)
Research Products
(25 results)
