Use of Electrically Excited Oxygen for the Low Temperature Decomposition of Organic Substances.

Gleit, Chester E.; Holland, W.D.

doi:10.1021/ac60191a031

Cited by 188 publications

(50 citation statements)

References 17 publications

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“…This type of plasma has long been known to have a catalytic effect in oxidizing virtually all types of carbonaceous materials (Gleit & Holland 1962;Gleit 1965;Hollahan 1966). The atomic oxygen and excited molecular species produced in the discharge readily react with organic matter in the paint, forming CO2 and H2O.…”

Section: Methods I -Sample Datingmentioning

confidence: 99%

Direct Radiocarbon Dating of Rock Art

1992

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ABSTRACT. In 14C dating of pictographs, we use a low-temperature oxygen plasma coupled with high-vacuum techniques to selectively remove carbon-containing material in the paint without contamination from the rock substrate, even if limestone (CaCO3). In addition to one previously published measurement, we analyzed two more pictograph samples, which are in accord with archaeological inference. A sample of known age charcoal, also processed by our method, matched the control. This technique produces little mass fractionation, the maximum 813C being 0.16%o from the untreated sample. Limestone decomposition does not occur during our procedure. Although the technique development is in its infancy, these new results demonstrate that our non-destructive technique has great potential for producing accurate 14C ages.

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Section: Methods I -Sample Datingmentioning

confidence: 99%

Direct Radiocarbon Dating of Rock Art

1992

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“…Hair samples were prepared by washing first in a sulfonated fatty acid detergent, followed by a rinse with deionized water and two ethanol solutions. After a final rinse in ethyl ether, hair samples were dried and ached by the low temperature decomposition using excited oxygen (Gleit and Holland 1962). Ashed samples were diluted with 0.1 N-nitric acid for determination of zinc and copper by atomic absorption spectrophotometry.…”

Section: Methodsmentioning

confidence: 99%

Zinc and copper contents in breast milk of japanese women.

Higashi

Ikeda

Uehara

et al. 1982

Tohoku J. Exp. Med.

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“…This was conducted in a stream of 02 excited by a radio-frequency discharge (Gleit and Holland, 1962). Any residual lung salts were removed by washing the samnples in 3 ml of cold ( 20°C) 0-2iW HCl before gravimetric estimations of the amounts of asbestos recovered were made using the infra-red spectrophotometric techniques described by Middleton, Beckett and Davis (1977).…”

Section: Methodsmentioning

confidence: 99%

Mass and number of fibres in the pathogenesis of asbestos-related lung disease in rats

Davis¹,

Beckett²,

Bolton³

et al. 1978

Br J Cancer

199

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Summary.-Five groups of rats were treated by inhalation for 12 months with the U.I.C.C. preparations of the 3 main commercially used asbestos types, chrysotile, crocidolite and amosite. The experiment was designed so that the effects of both fibre mass and fibre number could be examined. The results indicated that chrysotile dust caused far more lung fibrosis than either amphibole type even when the fibre numbers in the dust clouds were similar. All malignant pulmonary neoplasms found during this study occurred in animals treated with chrysotile. The fibre-number calculations used for the generation of dust clouds were evaluated using the parameters recommended by the Health and Safety Executive in 1976, by which all fibres over 5 ,um long are counted using a phase-contrast light microscope. When fibrelength distributions were calculated using a scanning electron microscope, however, it was found that the chrysotile clouds used in this study contained many more fibres over 20 ,um long than either of the amphibole clouds. The results, therefore, support previous suggestions that long asbestos fibres are more dangerous than short. They also indicate that neither a single mass standard, nor the present fibre-number standards are satisfactory.

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Use of Electrically Excited Oxygen for the Low Temperature Decomposition of Organic Substances.

Cited by 188 publications

References 17 publications

Direct Radiocarbon Dating of Rock Art

Direct Radiocarbon Dating of Rock Art

Zinc and copper contents in breast milk of japanese women.

Mass and number of fibres in the pathogenesis of asbestos-related lung disease in rats

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