Preface

Bourke, John B.; Felsot, Allan S.; GILDING, THOMAS J.; Jensen, Janice King; Seiber, James N.

doi:10.1021/bk-1992-0510.pr001

Cited by 2 publications

(2 citation statements)

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“…The methods include physical (evaporation, adsorption, filtration), chemical (hydrolysis, oxidation, incineration), biological (composting, landfarming, enzymatic, bioreactors), and combinations of various methods (Ferguson, 1991;Seiber, 1992). With each technology, analytes have traditionally been monitored using conventional analytical methods such as gas-liquid chromatography (GLC) and high-performance liquid chromatography (HPLC) to ensure the effectiveness of the treatment and to determine end-points for multiple-step processes.…”

Section: Introductionmentioning

confidence: 99%

Pesticide Waste Treatment Monitoring of s-Triazines Using Immunoassay

Muldoon¹,

Nelson²

1994

J. Agric. Food Chem.

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Section: Introductionmentioning

confidence: 99%

Pesticide Waste Treatment Monitoring of s-Triazines Using Immunoassay

Muldoon¹,

Nelson²

1994

J. Agric. Food Chem.

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“…Careful examination of the literature shows that two heterogeneous PCTA/DT formation pathways were proposed: Reactions from elemental carbon, sulfur, and chlorine- and sulfur-containing pesticides [22], and reactions from chemical precursors [23,24,25,26,27], which is the most direct route to the formation of PCTA/DTs. Among different precursors of PCTA/DTs, chlorothiophenols (CTPs) are demonstrated to be the most important precursors of PCTA/DTs, which is consistent with the widely recognized fact that chlorophenols (CPs) are identified to be predominant precursors of PCDD/DFs [23,24,28].…”

Section: Introductionmentioning

confidence: 99%

Quantum Chemical and Kinetic Study on Radical/Molecule Formation Mechanism of Pre-Intermediates for PCTA/PT/DT/DFs from 2-Chlorothiophenol and 2-Chlorophenol Precursors

Zuo

Wang

Pan

et al. 2019

IJMS

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Polychlorinated phenoxathiins (PCPTs), polychlorinated dibenzothiophenes (PCDTs), and polychlorinated thianthrenes (PCTAs) are sulfur analogues of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/DFs). Chlorothiophenols (CTPs) and chlorophenols (CPs) are key precursors for the formation of PCTA/PT/DTs, which can react with H or OH to form chloro(thio)phenoxy radical, sulfydryl/hydroxyl-substituted phenyl radicals, and (thio)phenoxyl diradicals. However, previous radical/radical PCTA/DT formation mechanisms in the literature failed to explain the higher concentration of PCDTs than that of PCTAs under the pyrolysis or combustion conditions. In this work, a detailed thermodynamics and kinetic calculations were carried out to investigate the pre-intermediate formation for PCTA/PT/DTs from radical/molecule coupling of the 2-C(T)P with their key radical species. Our study showed that the radical/molecule coupling mechanism explains the gas-phase formation of PCTA/PT/DTs in both thermodynamic and kinetic perspectives. The S/C coupling modes to form thioether-(thio)enol intermediates are preferable over the O/C coupling modes to form ether-(thio)enol intermediates. Thus, although the radical/molecule coupling of chlorophenoxy radical with 2-C(T)P has no effect on the PCDD/PT formation, the radical/molecule coupling of chlorothiophenoxy radical with 2-C(T)P plays an important role in the PCTA/PT formation. Most importantly, the pre-PCDT intermediates formation pathways from the couplings of sulfydryl/hydroxyl-substituted phenyl radical with 2-C(T)P and (thio)phenoxyl diradicals with 2-C(T)P are more favorable than pre-PCTA/PT intermediates formation pathways from the coupling of chlorothiophenoxy radical with 2-C(T)P, which provides reasonable explanation for the high PCDT-to-PCTA ratio in the environment.

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Preface

Cited by 2 publications

References 0 publications

Pesticide Waste Treatment Monitoring of s-Triazines Using Immunoassay

Pesticide Waste Treatment Monitoring of s-Triazines Using Immunoassay

Quantum Chemical and Kinetic Study on Radical/Molecule Formation Mechanism of Pre-Intermediates for PCTA/PT/DT/DFs from 2-Chlorothiophenol and 2-Chlorophenol Precursors

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