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Desorption characteristics of four polyimide sorbent materials using supercritical carbon dioxide and thermal methods.

Authors
Raymer-JH; Pellizzari-ED; Cooper-SD
Source
Anal Chem 1987 Oct; 59(17):2069-2073
NIOSHTIC No.
00187000
Abstract
A study was made to determine whether supercritical carbon-dioxide (CO2) desorption was equally applicable to the more highly retentive polyimides as it is applicable to Tenax-GC for the desorption of 1,2,3,4,5,6-hexachlorocyclohexane (608731), hexachlorobiphenyl, anthracene (120127), and parathion (56382). Carbon-14 labeled compounds were used for the recovery determinations. The identification of the compounds desorbed with supercritical CO2 was verified by using thin layer chromatography and mass spectrometry. The results were compared to those from Tenax-GC studies. The results indicated that supercritical fluid desorption method was superior to thermal desorption. Both types of desorption were more difficult from the polyimides than from Tenax-GC used in previous works. Anthracene was very poorly desorbed from the polymers, which indicated a high energy of adsorption. Results indicated that supercritical CO2 can be used to desorb three of the four test analytes from the polyimides, with recoveries being better using polymers of lower overall retention. Recoveries with thermal desorption were very poor for all of the sorbents with low desorption volumes; with larger desorption volumes, there was some improvement.
Keywords
NIOSH-Publication; NIOSH-Grant; Grants-other; Analytical-methods; Chemical-analysis; Analytical-chemistry
Contact
Analytical and Chemical Scis Research Triangle Institute PO Box 12194 Res Triangle Park, NC 27709
CODEN
ANCHAM
CAS No.
608-73-1; 120-12-7; 56-38-2
Publication Date
19871001
Document Type
Journal Article
Funding Amount
289350.00
Funding Type
Grant
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02108
Issue of Publication
17
Priority Area
Other Occupational Concerns; Grants-other
Source Name
Analytical Chemistry
State
NC
Performing Organization
Research Triangle Institute, Research Triangle, North Carolina
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