The combustion of municipal solid wastes and PCDD and PCDF emissions. Part 2. PCDD and PCDF in stack gases

Pitea, Demetrio; Bonati, Laura; Lasagni, Marina; Moro, Giorgio; Todeschini, Roberto; Chiesa, Giacomo

doi:10.1016/0045-6535(89)90038-6

Cited by 24 publications

(4 citation statements)

References 22 publications

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“…Other estimates and assumptions used in our model could affect our results. For instance, the source profile we used (Figure A) is reasonably representative of municipal waste incinerators ( − ), but such incinerators represent less than one-third of known sources of atmospheric PCDD/F (). The actual profile of total PCDD/F source emissions could be different, and this could change the model results significantly.…”

Section: Resultsmentioning

confidence: 99%

Polychlorinated Dibenzo-p-dioxins and Dibenzofurans: Gas-Phase Hydroxyl Radical Reactions and Related Atmospheric Removal

Brubaker

Hites

1997

Environ. Sci. Technol.

111

101

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Gas-phase reactions with the hydroxyl radical (OH) are expected to be an important removal pathway of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) in the atmosphere. Our laboratory recently developed a system to measure the rate constants of the gas-phase reactions of OH with semivolatile organic compounds using on-line mass spectrometry. We have now incorporated electron capture mass spectrometry (EC-MS) into this system to increase its sensitivity to PCDD/F, which tend to have low vapor pressures. OH reaction rate constants were determined in helium for 1,2,3,4-tetrachlorodibenzo-pdioxin at 373-432 K using a heated quartz reaction chamber. The photolysis of O 3 in the presence of H 2 O and the photolysis of H 2 O 2 (both at λ ) 254 nm) served as OH sources. An extrapolation using the Arrhenius equation gives a 1,2,3,4tetrachlorodibenzo-p-dioxin-OH reaction rate constant of 8.5 × 10 -13 cm 3 s -1 at 298 K, which is in excellent agreement with the value predicted by a structure-activity method. The predicted OH reaction rate constants for tetra-through octachlorodibenzo-p-dioxin and dibenzofuran isomers were used in a simple model of the atmospheric removal of PCDD/ F. The results of our model indicate that atmospheric removal is a combination of gas-phase removal processes of lower chlorinated dioxins and furans and particlephase removal processes of higher chlorinated ones.

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Section: Resultsmentioning

confidence: 99%

Polychlorinated Dibenzo-p-dioxins and Dibenzofurans: Gas-Phase Hydroxyl Radical Reactions and Related Atmospheric Removal

Brubaker

Hites

1997

Environ. Sci. Technol.

111

101

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“…The initial reactant concentrations were (in molecule cm-3 units) CH3ONO, -2.4 X 1014; NO, -2. p-dioxin, (1.6-4.1) X 1011, or dibenzofuran, (2.4-3.0) X 1012; and cyclohexane or propene, (2.4-4.8) X 1013. Irradiations were carried out for [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] min at the maximum light intensity for the experiments with cyclohexane as the reference compound, and they were carried out for 3-24 min at 50% of the maximum light intensity for the experiments with propene as the reference compound. The maximum light intensity corresponded to an NO2 photolysis rate of 7.5 X 10"3 s"1.…”

Section: Dibenzofuran Experimental Sectionmentioning

confidence: 99%

Gas-phase atmospheric chemistry of dibenzo-p-dioxin and dibenzofuran

Kwok¹,

Arey²,

Atkinson³

1994

Environ. Sci. Technol.

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“…The vapor pressures at 298 K of the PCDDs, PCDFs, and PCBs decrease from ~4 10-4 Torr for dibenzo-p-dioxin, ~3 10-3 Torr for dibenzofuran and 8 10-3 Torr for biphenyl to <10-11 Torr for octachlorodibenzo-p-dioxin and octachlorodibenzofuran and ~4 Torr for decachlorobiphenyl (47,48). In the atmosphere, the PCDDs, PCDFs, and PCBs are partitioned between the gas and particle phases, with the major determining factor being the liquid-phase vapor pressure at the ambient atmospheric temperature (49,50).…”

Section: Introductionmentioning

confidence: 95%

Rate Constants for the Gas-Phase Reactions of the OH Radical with Dichlorobiphenyls, 1-Chlorodibenzo-p-dioxin, 1,2-Dimethoxybenzene, and Diphenyl Ether: Estimation of OH Radical Reaction Rate Constants for PCBs, PCDDs, and PCDFs

Kwok¹,

Atkinson²,

Arey³

1995

Environ. Sci. Technol.

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The combustion of municipal solid wastes and PCDD and PCDF emissions. Part 2. PCDD and PCDF in stack gases

Cited by 24 publications

References 22 publications

Polychlorinated Dibenzo-p-dioxins and Dibenzofurans: Gas-Phase Hydroxyl Radical Reactions and Related Atmospheric Removal

Polychlorinated Dibenzo-p-dioxins and Dibenzofurans: Gas-Phase Hydroxyl Radical Reactions and Related Atmospheric Removal

Gas-phase atmospheric chemistry of dibenzo-p-dioxin and dibenzofuran

Rate Constants for the Gas-Phase Reactions of the OH Radical with Dichlorobiphenyls, 1-Chlorodibenzo-p-dioxin, 1,2-Dimethoxybenzene, and Diphenyl Ether: Estimation of OH Radical Reaction Rate Constants for PCBs, PCDDs, and PCDFs

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