Method and device for the determination of low concentrations of

Details Method and device for the determination of low concentrations of Method and device for the determination of low concentrations of

1991-09-24

1992-08-18

Housel, James C.

Chemistry: analytical and immunological testing

Oxygen containing

Molecular oxygen

436 59, 436127, 436155, 422 80, G01N 3112

Patent

active

051399580

ABSTRACT:
Oxygen in carbonaceous materials is converted to carbon monoxide (CO) by pyrolyzing the material in a stream of oxygen-free helium. The CO is reacted with Ni.sup.63, a readioactive isotope of nickel, to form nickel tetracarbonyl (Ni.sup.63 (CO).sub.4) which is carried by the helium stream into a flow-through gas proportional counter. The quantity of Ni(CO).sub.4 is determined by the radioactivity of the gas as measured by the gas proportional counter. After exiting the flow through counter the Ni.sup.63 (CO).sub.4 is destroyed by exposing it to high temperatures. The Ni.sup.63 is retained within the apparatus while the CO is flushed from the system after being oxidized to carbon dioxide (CO.sub.2). The detection limit is estimated to be less than 1 part per billion oxygen for a 10 mg sample.

REFERENCES:
patent: 3374064 (1968-03-01), Kolsto
patent: 4601882 (1986-07-01), Benner
patent: 4741817 (1988-05-01), Croset et al.
patent: 4744805 (1988-05-01), Maroulis et al.
patent: 4800747 (1989-01-01), Tsuji et al.

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