Significance of measuring non-2,3,7,8-substituted PCDD/PCDF congeners and the identification of a new mechanism of formation for a high-temperature industrial process

Tondeur, Yves; Vining, Bryan; Serne, J.C.; Hart, Jerry

doi:10.1016/j.chemosphere.2015.01.046

Cited by 7 publications

(1 citation statement)

References 12 publications

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“…The relative quantitative measurement of non-2,3,7,8-PCDD/Fs can be performed from sample to sample and calculated by comparing to the closest eluting standard’s response factor. ,, In this study, 12 of the 119 non-2,3,7,8-PCDD/F congeners were detected and quantified from CP products. These congeners included three TCDF congeners, five PeCDF congeners, one HxCDF congener, one HpCDF congener, one TCDD congener, and one HpCDD congener.…”

Section: Resultsmentioning

confidence: 99%

Occurrence and Formation Mechanism of PCDD/Fs and SCCPs in Chlorinated Paraffin Products

He,

Liu,

Gao

et al. 2023

Environ. Sci. Technol.

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Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and short-chain chlorinated paraffins (SCCPs) can be formed during the production of chlorinated paraffins (CPs). Detection and accurate quantification of PCDD/Fs in CPs are challenging because of their matrix complexity. Therefore, the occurrence and formation mechanisms of PCDD/Fs from CPs have not been studied extensively in the past. In this study, 15 commercial samples including solid and liquid CPs were collected in 2022 from China. The average ΣSCCP concentrations detected in the solid and liquid CPs were 158 and 137 mg/g, respectively. The average International Toxic Equivalent (I-TEQ) values of 2,3,7,8-PCDD/F in solid and liquid CPs were 15.8 pg I-TEQ/g and 15.0 pg I-TEQ/g, respectively. The solid and liquid CPs had different predominant congener groups for SCCPs and PCDD/Fs. Possible formation routes for the generation of PCDD/Fs were analyzed by screening precursors in paraffin and laboratory-scale thermochemical experiments of CPs. The transformation between 2,3,7,8-PCDD/Fs and non-2,3,7,8-PCDD/Fs was recognized by calculating the successive chlorination preference. The first reported occurrence of PCDD/Fs in CP commercial products indicated that exposure to CPs and downstream products might be an assignable source of PCDD/F emission, which is of great significance to further explore the control factors of PCDD/Fs in the whole life cycle of CPs.

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Section: Resultsmentioning

confidence: 99%