比色センサを用いたヒト皮膚より放散されるNO2測定法の検討

• Published in: Journal of environmental chemistry Vol. 26; no. 3; pp. 123 - 129
• Main Authors: 日野, 慎司, 鈴木, 義史, 斉藤, 史弥, 丸尾, 容子
• Format: Journal Article
• Language: Japanese
• Published: Tsukuba 一般社団法人 日本環境化学会 01.01.2016; Japan Science and Technology Agency
• Subjects: Absorbance; Aldehydes; Ankle; Azo dyes; Colorimetry; Emission analysis; Emission measurements; Neck; Nitrogen dioxide; Polytetrafluoroethylene; Sensors; Skin; Thigh
• ISSN: 0917-2408; 1882-5818
• DOI: 10.5985/jec.26.123

We had previously developed a colorimetric sensing element for measuring atmospheric nitrogen dioxide (NO2) concentration. The sensor element has an absorption peak at 525 nm, and exposed NO2 concentration is calculated from absorbance change and exposure time. We used the sensor element as a passive sampler for measuring of NO2 emission from human skin and evaluated a performance of the passive sampler. First of all, in order to attach the passive sampler on human skin, a structure that was made of PTFE membrane filter's bag and adhesive plaster (Band-Aid) was invented. Interference gas that was released from the invented structure was under detection limit. Next, we experimentally determined the conversion formula that convert an absorbance change of the sensor element into an azo dye's amount. After that, we measured NO2 emission from human skin using a combination of the passive sampler and the structure. We picked up 7 measurement points (neck, underarm side, arm, waist, inner thigh, calf and ankle) and measured NO2 emission from a human skin of a man in a schoolroom with low atmospheric NO2 concentration during 8 hours. The obtained values were 2.6±2.3 ng/(cm2･h), 1.5±1.9 ng/(cm2･h) and 0.9±0.6 ng/(cm2･h) for underarm side, neck and ankle, respectively. We have successfully measured NO2 emission distribution of a human body using developed passive sampler and invented structure.