The mass spectrometry of polychlorinated dibenzo‐<i>p</i>‐dioxins

Hass, J. Ronald; Friesen, Marlin D.; Hoffman, Michael K.

doi:10.1002/oms.1210140105

Cited by 55 publications

(38 citation statements)

References 21 publications

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“…Mass spectra of PCDPEs were characterized by the presence of their molecular ion cluster and their distribution of 37 Cl isotope ions. In general, PCDPEs were common impurities in chlorophenols and other industrial chemicals, 20 and they could be also formed by photolysis of PCP. In EI, they yielded intense molecular ions and [M-Cl2] + ions.…”

Section: Identification Of Pcp Photodegradation Productsmentioning

confidence: 99%

Identification of Photolytical Transformation Products of Pentachlorophenol in Water

et al. 2000

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The photodegradation of pentachlorophenol in water was examined with a high-pressure mercury lamp. A number of photodegradation products of pentachlorophenol, such as less-chlorinated phenols through reductive dechlorination, and catechol and trihydroxylated products via the addition of hydroxyl radicals, were observed as major products. Moreover, polychlorinated biphenylethers, hydroxylated polychlorobiphenylethers and polychlorinated dibenzo-p-dioxins as minor products were also formed by dimerization process during the photolysis of pentachlorophenol. These compounds were identified by gas chromatography-mass spectrometry. The degradation rate of PCP in water was measured against the UV-irradiation time. After the irradiation for 15 min, 75% of PCP was converted into a number of products through reductive dechlorination and oxidation. On the basis of the identified products, the photodegradation pathways of PCP under UV irradiation were proposed.

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Section: Identification Of Pcp Photodegradation Productsmentioning

confidence: 99%

Identification of Photolytical Transformation Products of Pentachlorophenol in Water

et al. 2000

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“…65 The quasimolecular [M + HIi ion is the most abundant ion observed. The next most abundant ion, [M-Cl]', has a relative abundance that differs somewhat among positional isomers, as shown in Table 2.…”

Section: Chemical Ionizationmentioning

confidence: 99%

The mass spectrometry of chlorinated dibenzo-p-dioxins

Mahle

Shadoff

1982

Biol. Mass Spectrom.

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All aspects of the use of mass spectrometry for the identification and quantitation of chlorodibenzo-p-dioxins are critically reviewed. The mass spectra obtained by various ionization methods are discussed. Numerous mass spectral techniques and cleanup procedures are covered, with emphasis on their interrelationships. These techniques have been applied to the determination of chlorodibenzo-p-dioxins in many different matrices, including product materials, such as chlorophenols and phenoxy acid herbicides, and toxicological and environmental materials such as cattle, fish, rodent and human tissues. Formation and degradation studies, which include thermal chemistry, photochemistry and chemical stability and degradation, are presented. Numerous considerations in the handling and quantitation of chlorodibenzo-p-dioxins, such as interferences, detection limits and recovery studies, are evaluated.

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“…Recently, several other modes of mass spectrometry involving chemical ionization with reagent gases such as methane, oxygen-doped methane, and isobutane have been used to improve sensitivity and in some cases isomer specificity (25)(26)(27).…”

Section: Conjrmatory Techiziques Usiizg Gclinsmentioning

confidence: 99%

Recent advances in ultratrace analysis of dioxins and related halogenated hydrocarbons

Afghan¹,

Carron²,

Goulden³

et al. 1987

Can. J. Chem.

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Can. J. Chem. 65, 1086Chem. 65, (1987.Analytical methodology for polychlorinated dioxins and furans (PCDDs and PCDFs) in environmental samples is not standardized. Many variations exist for the extraction, cleanup, quantitation, and confirmation of these compounds and reported detection limits and recoveries vary over several orders of magnitude. This paper describes research carried out at the Canada Centre for Inland Waters over the past seven or eight years to develop reliable methodology at ultratrace levels (10-'2-10-l 5 g/g) applicable to a wide range of environmental samples. Extraction techniques are described for biological tissue (fish, clams, leaches, eggs), fly ash, sediments, and water. Detailed cleanup procedures for the various matrices consist of most or all of the following: gel permeation chromatography liquid/liquid extraction with Na3P04, liquid/liquid extraction with H2S04, basic alumina chromatography, and carbon fibre chromatography. Preliminary screening of the cleaned extracts is achieved by gas chromatography equipped with a mass selective detector and positive identification by gas chromatography /mass spectrometry operated in electron impact and chemical ionization modes and with full scan and multiple ion detection. Custom software permitting the analysis of a wide range of compounds in a single run by gc/ms is reported. The presence of specific isomers of PCDDs and PCDFs is confirmed by high resolution gas chromatography /mass spectrometry. A radioimmunoassay screening procedure for PCDDs in environmental samples is also described. Les mtthodes d'analyse des dioxinnes et des furannes polychlorts (DPC et FPC) ne sont pas standardisees. Plusieurs variations existent pour l'extraction, le nettoyage, la quantification et la confirmation de la prtsence de ces composCs; de plus, les limites de dttection ainsi que les taux de rtcuptration rapportCs varient par plusieurs ordres de grandeur. Dans ce travail, on dtcrit les etudes effectukes au cours des 7 a 8 dernikres anntes au centre canadien des eaux inttrieures dans le but de dtvelopper une mtthodologie applicable a des niveaux d'ultratraces (lo-" h 10-g/g) et a un grand Cventail d'tchantillons prtlevts dans I'environnement. On dtcrit des techniques d'extraction pour des tissus biologiques (poissons, moules, eaux de lessivage et oeufs), des suies, des sediments et des tchantillons d'eau. Les diverses mCthodes dCtaillCes proposCes pour le nettoyage de diverses matrices comportent la plupart ou toutes les techniques suivantes: chromatographie par permCation de gel; extraction liquide/liquide avec du Na3P04; extraction liquide/liquide avec du &So4; chromatographie standards sur de l'alumine ou des fibres de charbon.On a effectut des essais prtliminaires sur des extraits IavCs en faisant appel a la chromatographie en phase gazeuse couplte h un dttecteur sClectif de masses; on a proctdC I'identification positive par chromatographie en phase gazeuse couplCe la spectromCtrie de masse, optrCe soit dans le mode d'impact Clectronique ou d'ionisat...

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The mass spectrometry of polychlorinated dibenzo‐p‐dioxins

Cited by 55 publications

References 21 publications

Identification of Photolytical Transformation Products of Pentachlorophenol in Water

Identification of Photolytical Transformation Products of Pentachlorophenol in Water

The mass spectrometry of chlorinated dibenzo-p-dioxins

Recent advances in ultratrace analysis of dioxins and related halogenated hydrocarbons

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