Research on measurement of urban C8H8 by open optical path detection system

Abstract

As a Class 2B carcinogen, C8H8 has great hidden danger to human health. Domestic research on the detection of styrene in the atmosphere is relatively lacking. Therefore, this article determined proper retrieval range of wavelength and a method to eliminate interference based on the absorption feature in the UV region. An open optical path detection system was set up based on the principle of ultraviolet differential absorption spectroscopy. The detection limit of C8H8 is 9.0μg/m3 when the optical path reaches 100m. The outdoor field measurement of C8H8 was carried out in Binjiang District of Hangzhou, indicating the daily average variation of styrene gas. The results showed that the maximum concentration of C8H8 is 60.6μg/m3, the minimum concentration is 38.2μg/m3 and the average concentration is 53.5μg/m3.