적외선양자폭포레이저와 차등흡광법을 이용한
대기 중 HONO와 H2O2의 동시 연속 측정 타당성 연구
안준영1·박진수1·최진수1·임재현1·정유미2·이강웅2,†
1국립환경과학원 대기환경과, 2한국외국어대학교 환경학과

Feasibility Study for Simultaneous Measurements of
Atmospheric HONO and H2O2 using a Tunable Infrared Quantum
Cascade Laser Differential Absorption Spectrometer (QC-TILDAS)
Joon Young Ahn1, Jin Su Park1, Jinsu Choi1, Jae-Hyun Lim1, Yoo-mi Chung2, and Gangwoong Lee2,†
1Climate & Air Quality Research Department, National Institute of Environmental Research, Incheon, Korea
2Department of Environmental Science, Hankuk University of Foreign Studies, Yongin, Korea
Received December 17, 2012/Revised February 1, 2013/Accepted February 14, 2013

We tested a tunable laser differential absorption spectrometer with two mid-infrared continuous-wave mode
quantum cascade lasers (cw-QCLs) for simultaneous measurements of nitrous acid (HONO) and hydrogen peroxide
(H2O2) in the remote marine atmosphere at Baengyeong Island, Korea in October 2012. Two lasers
scanned frequencies that covered approximately 0.2 cm-1 near at 1277.15 cm-1 and 1283.3 cm-1 for HONO and
H2O2, respectively with resolution of about 0.001 cm-1 per channel. Ambient air sample was drawn to a 260
m multi-pass astigmatic sampling path cell at reduced pressure and light transmissions along predefined frequency
ranges were detected at two peltier cooled HgCdTe detectors. The resulting one hour detection limits
based on 2 s of background signal noise are 0.17 ppbv for HONO and 0.12 ppbv for H2O2. The concentrations
over the measurement periods varied from below the detection limit to 0.8 ppbv for HONO, and from 0.5 ppbv
to 0.8 ppbv for H2O2, respectively. Sensitivities and detection limits for QC-TILDAS of HONO and H2O2 were
acceptable for their continuous monitoring in the remote background air. However, we found that further
improvement could be achieved by the stabilizing intensities of transmitted laser light sources and reducing the
humidity interferences.
Key words: HONO, H2O2, QC-TILDAS, Baengyeong Island