On-line monitoring system of P5CDF homologues in waste incineration plants using VUV-SPI-IT-TOFMS.
It usuallytakes a few weeks to analyze dioxin concentrations and dioxin-TEQ (toxicity equivalency quantity) in fluegases from municipal solid waste (MSW) incinerators by a standard method provided by Japanese industrial standard (JIS 0311). To reduce the required time for analysis, we have developed a new on-line measuring system for furans homologues. This system is composed of a sensitive and robust vacuum ultraviolet (VUV) single-photon ionization (SPI) ion trap (IT) time-of-flight mass spectrometer (VUV-SPI-IT-TOFMS) and automatic sampling/concentrating process. In this work, pentachloro-dibenzofuran (P5CDF) was selected as an index homologue in chlorinated dibenzo-p-dioxin/ furan homologues (DXNs) because its concentration and I-TEF (international toxicity equivalency factor), which are 2,3,4,7,8-P5CDF is 0.5 and 1,2,3,7,8-P5CDF is 0.05, are high and the concentration correlates closely with the total amount of dioxin-TEQ. The lowest detectable limit, 1 pg (0.001 ng-TEQ/m3 N) was demonstrated by laboratory tests. This system underwent a field test at several actual MSW plants and the tests revealed the following: (a) This system is applicable for dioxin-TEQ evaluation from actual MSW incinerators. (b) It can continuously monitor P5CDF in a fluegas for 7 months. (c) The frequency of the measurements is once every 2-6 h, depending on the concentration of P5-CDF.
Tsuruga
Shigenori
S
Yokohama Research & Development Center, Mitsubishi Heavy Industries, Ltd., 1-8-1 Sachiura, Kanazawa-ku, Yokohama, 236-8515, Japan. shigenori_tsuruga@mhi.co.jp
Suzuki
Takumi
T
Takatsudo
Yasuhiro
Y
Seki
Katsuo
K
Yamauchi
Sumio
S
Kuribayashi
Shizuma
S
Morii
Shigeki
S
D001572:Benzofurans / Q000032:analysis*; D002138:Calibration; D017745:Incineration; D013058:Mass Spectrometry / Q000379:methods*; D009862:Online Systems; D014866:Waste Products / Q000032:analysis*
D001572:Benzofurans; D014866:Waste Products; C057584:1,2,3,7,8-pentachlorodibenzofuran; C038890:2,3,4,7,8-pentachlorodibenzofuran