Method of determining small concentrations of chemical compounds

Details Method of determining small concentrations of chemical compounds Method of determining small concentrations of chemical compounds

1979-11-05

1981-03-31

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250282, 250283, B01D 5944

Patent

active

042595738

ABSTRACT:
An accurate method of determining by plasma chromatography the concentration of an ionizable gaseous or volatile chemical species A in air or another gaseous medium. Small, known increments of species A plus, optionally, another calibrant species are introduced in turn into the plasma chromatograph together with the unknown sample; and the respective changes of the amplitude or area of a characteristic ion peak of species A in the unknown sample are measured. The second, optical calibrant, which is different from species A, must have similar kinetic characteristics but a different ion mobility from the ion formed by A. By means of this technique, inaccurate readings caused by background concentration variations are significantly reduced.

REFERENCES:
patent: 3621239 (1971-11-01), Cohen
patent: 3626180 (1971-12-01), Carroll et al.
patent: 3626182 (1971-12-01), Cohen
"Instrumental Methods of Analysis", Willard et al., monogram published by D. Von Nostrand Co., 4th Ed., pp. 342-344 and 695.

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