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.
In this paper, based on the analysis of the shortcomings of three-point comparison odor bag method, gas chromatography method and gas sensor, a malodorous gas monitoring device based on differential optical absorption spectroscopy (DOAS) is designed. This paper focuses on testing six gases, including carbon disulfide, styrene, dimethyl disulfide and so on. The total length of the optical path is 60cm. When the standard deviation is twice, the detection limit of these gases is around 0.10ppm. The results of mixed malodorous by measured show that the interference between components is very small, and the relative error of each component is less than 3% of the full scale by least square method. The odor gas emission monitoring device based on DOAS technology designed in this paper has the advantages of simple device and high measurement accuracy, which can meet the application requirements of field measurement.
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