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4 results on '"GREG P. MALIS"'

1. Isomer-specific determination of hexachlorodibenzo-p-dioxins by oxygen negative chemical ionization mass spectrometry, gas chromatography, and high-pressure liquid chromatography

Author

Narine P. Gurprasad, Walter F. Miles, and Greg P. Malis

Subjects
Chemical ionization, Chromatography, Liquid chromatography–mass spectrometry, Chemistry, Ionization, Analytical chemistry, Atmospheric-pressure chemical ionization, Gas chromatography, Direct electron ionization liquid chromatography–mass spectrometry interface, Mass spectrometry, High-performance liquid chromatography, Analytical Chemistry
Abstract

All ten hexachlorodibenzo-p-dioxin (HCDD) isomers, prepared by micropyrolysis of chlorophenates, were studied by using mass spectrometry, gas chromatography, and high-pressure liquid chromatography. Of several ionization modes studied, oxygen negative chemical ionization was the most suitable for isomer identification. This technique enabling isomer specific identification to be carried out was applied to hexachlorodioxin impurities in pentachlorophenol samples and detected small amounts of 4:2 substituted isomer not previously known. 17 references, 7 figures, 2 tables.

Published
1985
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2. Isomer specific determination of hexachlorodioxins in technical pentachlorophenol (PCP) and its sodium salt

Author

Joginder Singh, Greg P. Malis, Walter F. Miles, and Narine P. Gurprasad

Subjects
Chemical ionization, Environmental Engineering, Chromatography, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, chemistry.chemical_element, General Medicine, General Chemistry, Pollution, Oxygen, Pentachlorophenol, Sodium salt, chemistry.chemical_compound, chemistry, Environmental Chemistry, Nuclear chemistry
Abstract

A newly developed approach involving oxygen negative chemical ionization was employed to achieve isomer specific analysis of all ten hexachlorodioxins (HxCDD). A group of technical pentachlorophenols (PCP) and sodium salts of pentachlorophenol (NaPCP) originating from five different manufacturers were analyzed and the levels of different isomers of hexachlorodioxins determined. 1,2,3,6,7,8-HxCDD was the most abundant isomer in all the PCPs tested with levels ranging from 0.30 ppm to 21.3 ppm. The 1,2,3,7,8,9-HxCDD isomer was also found to be present in all the PCP samples but at lower levels of 0.01 ppm to 0.71 ppm. All ten isomers of HxCDD were observed in all samples of the sodium salts of PCP, however the 1,2,3,6,7,9-/1,2,3,6,8,9-HxCDD pair was the most abundant. The isomer distribution was found to be quite consistent in samples from the same manufacturer.

Published
1985
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4. Chemical and Biological Controls in Forestry

Author

WILLA Y. GARNER, JOHN HARVEY, VIRGIL H. FREED, LARRY R. NELSON, DEAN H. GJERSTAD, PATRICK J. MINOGUE, T. EVAN NEBEKER, RUSSELL F. MIZELL, NORMAN J. BEDWELL, P. J. SILK, L. P. S. KUENEN, REIDAR LIE, MAURO E. MARTIGNONI, JOHN NEISESS, ROBERT B. EKBLAD, JOHN W. BARRY, NORMAN B. AKESSON, WESLEY E. YATES, CHARLES J. WIESNER, RICHARD K. DUMBAULD, LEO J. FRITSCHEN, W. F. SPENCER, W. A. JURY, W. J. FARMER, W. D. MARSHALL, W. N. YULE, D. J. ECOBICHON, DONALD G. CROSBY, J. A. ARMSTRONG, K. M. S. SUNDARAM, P. D. KINGSBURY, S. B. HOLMES, GREG P. MALIS, DEREK C. G. MUIR, W. L. LOCKHART, D. A. METNER, B. N. BILLECK, G. P. RAWN, D. C. G. MUIR, T. L. LAVY, J. D. MATTICE, JAMES M. WITT, PEARL WEINBERGER, R. GREENHALGH, JACK K. WINJUM, LOGAN A. NORRIS, WILLA Y. GARNER, JOHN HARVEY, VIRGIL H. FREED, LARRY R. NELSON, DEAN H. GJERSTAD, PATRICK J. MINOGUE, T. EVAN NEBEKER, RUSSELL F. MIZELL, NORMAN J. BEDWELL, P. J. SILK, L. P. S. KUENEN, REIDAR LIE, MAURO E. MARTIGNONI, JOHN NEISESS, ROBERT B. EKBLAD, JOHN W. BARRY, NORMAN B. AKESSON, WESLEY E. YATES, CHARLES J. WIESNER, RICHARD K. DUMBAULD, LEO J. FRITSCHEN, W. F. SPENCER, W. A. JURY, W. J. FARMER, W. D. MARSHALL, W. N. YULE, D. J. ECOBICHON, DONALD G. CROSBY, J. A. ARMSTRONG, K. M. S. SUNDARAM, P. D. KINGSBURY, S. B. HOLMES, GREG P. MALIS, DEREK C. G. MUIR, W. L. LOCKHART, D. A. METNER, B. N. BILLECK, G. P. RAWN, D. C. G. MUIR, T. L. LAVY, J. D. MATTICE, JAMES M. WITT, PEARL WEINBERGER, R. GREENHALGH, JACK K. WINJUM, and LOGAN A. NORRIS

Subjects
Forest insects--Control--Congresses, Forest insects--Biological control--Congresses, Forest protection--Congresses, Pesticides--Congresses, Pesticides--Environmental aspects--Congresses, Pesticides--Toxicology--Congresses
Published
1984

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