Chemistry: physical processes – Physical processes – Crystallization
Patent
1979-07-27
1981-02-10
Smith, William F.
Chemistry: physical processes
Physical processes
Crystallization
23232R, 422 88, 55 70, 423245, 252436, 252434, 252428, 252184, G01N 3100, G01N 2762, C01G 2800
Patent
active
042499046
ABSTRACT:
A method and apparatus are disclosed for extracting N-nitroso compounds from air samples without artifact formation of nitrosamines from precursors in the sample. The apparatus includes a cartridge having two zones between a first port and a second port. The first zone, closest to the first port, contains an air pervious packing of a granular, solid phase amine complexing agent. The second zone, closest to the second port, contains an air pervious packing of a mixture of a granular, solid phase amine complexing agent and a particulate sorbent adapted to extract and concentrate N-nitroso compounds from air. The method includes a first step of driving an air sample through the first and second contiguous zones of the cartridge in succession, and a second step of driving an eluent through the second and first zones in succession, or backflushing the cartridge. To extract N-nitroso compounds, the eluent is a polar, or nitrogenous based, solvent for both N-nitroso compounds and the amine complexing agent in the second zone of the cartridge. The method may contain the further step of determining the N-nitroso compound concentration of at least a portion of the eluate which passes from the first zone following the second step of the method.
REFERENCES:
patent: 1864988 (1932-06-01), Downs
patent: 2140271 (1938-12-01), Schwarcman
patent: 2237459 (1941-04-01), Thompson
patent: 2694923 (1954-11-01), Carpenter
patent: 3996002 (1976-12-01), Fire
patent: 4003257 (1977-01-01), Fletcher et al.
patent: 4131544 (1978-12-01), Elani
Russell, J. W., Environmental Science and Technology, vol. 9, No. 13, 1975, p. 1175.
Fire, D. H. et al., Environmental Science and Technology, vol. 11, No. 6, p. 577, 1977.
Reisch John W.
Rounbehler David P.
Konkol Chris
Messenger Herbert E.
Neal James L.
Smith William F.
Thermo Electron Corporation
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