title: Dopant-assisted negative photoionization Ion mobility spectrometry coupled with on-line cooling inlet for real-time monitoring H2S concentration in sewer gas.
abstract: Malodorous hydrogen sulfide (H2S) gas often exists in the sewer system and associates with the problems of releasing the dangerous odor to the atmosphere and causing sewer pipe to be corroded. A simple method is in demand for real-time measuring H2S level in the sewer gas. In this paper, an innovated method based on dopant-assisted negative photoionization ion mobility spectrometry (DANP-IMS) with on-line semiconductor cooling inlet was put forward and successfully applied for the real-time measurement of H2S in sewer gas. The influence of moisture was effectively reduced via an on-line cooling method and a non-equilibrium dilution with drift gas. The limits of quantitation for the H2S in ≥60% relative humidity air could be obtained at ≤79.0ng L(-1) with linear ranges of 129-2064ng L(-1). The H2S concentration in a sewer manhole was successfully determined while its product ions were identified by an ion-mobility time-of-fight mass spectrometry. Finally, the correlation between sewer H2S concentration and the daily routines and habits of residents was investigated through hourly or real-time monitoring the variation of sewer H2S in manholes, indicating the power of this DANP-IMS method in assessing the H2S concentration in sewer system.
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Liying
authors.initials: L
authors.lastname: Peng
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors.forename: Dandan
authors.initials: D
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China.
authors.forename: Zhenxin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Hua
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China. Electronic address: hli@dicp.ac.cn.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Li
mesh_terms: D061006:Bays; D005740:Gases; D006862:Hydrogen Sulfide; D007477:Ions; D013058:Mass Spectrometry; D009862:Online Systems; D012722:Sewage; D013057:Spectrum Analysis
chemical_list: D005740:Gases; D007477:Ions; D012722:Sewage; D006862:Hydrogen Sulfide
keywords: Dopant-assisted negative photoionization; Hydrogen sulfide; Ion mobility spectrometry; Semiconductor cooling; Sewer gas