News Column

Studies from Osaka Prefecture University in the Area of Nitrogen Described (Direct measurement system of nitrogen dioxide in the atmosphere using a...

August 22, 2014



Studies from Osaka Prefecture University in the Area of Nitrogen Described (Direct measurement system of nitrogen dioxide in the atmosphere using a blue light-emitting diode induced fluorescence technique)

By a News Reporter-Staff News Editor at Science Letter -- Research findings on Nitrogen are discussed in a new report. According to news reporting out of Osaka, Japan, by NewsRx editors, research stated, "An instrument for measuring atmospheric nitrogen dioxide has been developed by a light-emitting diode induced fluorescence (LED-IF) technique. Air was introduced into a fluorescence detection cell."

Our news journalists obtained a quote from the research from Osaka Prefecture University, "A pulsed blue light LED with a peak wavelength of 430 nm was irradiated to excite NO2 molecules in this cell. Fluorescence emitted from excited NO2 molecules was detected by a dynode-gated photomultiplier tube. The current detection limit of the LED-IF instrument was estimated to be 7.0 and 0.91 ppbv (parts per billion by volume) at 1-min and 1-h integration times, respectively, with a signal to noise ratio of 2. This result indicates that this LED-IF instrument can measure sufficiently precise 1-h values of NO2 concentrations in the urban atmosphere. An NO2 test observation and an intercomparison of the LED-IF instrument with an NO2 measurement system based on a photolytic converter/NO-O-3 chemiluminescence method were performed in the urban atmosphere. Concentration differences between the two methods were within +/- 25% for about 90% of the data."

According to the news editors, the research concluded: "It has been demonstrated by these observations that NO2 concentrations can be observed in the urban areas using the LED-IF instrument."

For more information on this research see: Direct measurement system of nitrogen dioxide in the atmosphere using a blue light-emitting diode induced fluorescence technique. Review of Scientific Instruments, 2014;85(6):282-286. Review of Scientific Instruments can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Review of Scientific Instruments - rsi.aip.org/)

Our news journalists report that additional information may be obtained by contacting Y. Sadanaga, Osaka Prefecture Univ, Grad Sch Engn, Naka Ku, Sakai, Osaka 5998531, Japan. Additional authors for this research include K. Suzuki, T. Yoshimoto and H. Bandow (see also Nitrogen).

Keywords for this news article include: Asia, Osaka, Japan, Chemicals, Chemistry, Electronics, Nitrogen Oxides, Nitrogen Dioxide, Light-emitting Diode

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Science Letter


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters