A Study on N2O Measurement Characteristics Using Photoacoustic Spectroscopy (PAS)

Sensors

Soyoung Kang¹  Seoungjin Kim¹  Seongmin Kang¹  Jeongwoo Lee¹  Chang-Sang Cho¹  Jea-Hwan Sa² 

[1] Cooperate Course for Climate Change, Sejong University, Seoul 143-747, Korea; E-Mails:;Environment & Energy Institute, Sejong University, Seoul 143-747, Korea; E-Mail:

关键词: greenhouse gas;    nitrous oxide;    photoacoustic spectroscopy;    gas chromatography;   

DOI  :  10.3390/s140814399

来源: mdpi

【 摘 要 】

N₂O, which is emitted mainly from nitrogen decomposition via bacteria, livestock manure, agricultural fertilizer use, fossil fuel combustion and waste incineration, is classified as a substance that causes significant destruction of the ozone layer. The N₂O measurement methods for these emission sources may be divided into chromatography, optical, and electrical current measurements. Chromatography has been widely utilized for analyzing N₂O. However, up until now, few studies have been conducted on N₂O using photoacoustic spectroscopy. Therefore, this study aimed to evaluate performance of photoacoustic spectroscopy in this regard based on laboratory and field test results. The repeatability of photoacoustic spectroscopy was measured at 1.12%, which is lower than the repeatability of 3.0% suggested by the ISO 1564 standard, so, it has shown an excellent repeatability. The detection limit was determined to be 0.025 ppm, and the response time was confirmed to be 3 min and 26 s. The results of comparison between these measurements and GC show that the latter has superior accuracy, but mobility and convenience are superior for PAS. On the contrary, GC has a continuous measurement limitation, but PAS makes it possible to conduct continuous measurements. Therefore, PAS can be extremely useful to confirm the characteristics of N₂O emissions and to quantify their amount.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.