期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 43, 期 3, 页码 790-795出版社
AMER CHEMICAL SOC
DOI: 10.1021/es801621f
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资金
- University of Wisconsin-Madison
Direct, in situ detection of gas phase formaldehyde (HCHO) via laser induced fluorescence in a White-type multipass cell is demonstrated with a (3 sigma) limit of detection of similar to 0.051 parts per billion by volume in a 1 s sampling time. Calibration is performed in two ways: using permeation tubes and with air bubbled through an aqueous solution of HCHO. The concentration of HCHO output from the bubbler is measured by cavity ring-down spectroscopy. Measurement of ambient HCHO is carried out at the University of Wisconsin, Madison for a period of several days.
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