Aqueous ferrioxalate compositions useful as calibrants

Details Aqueous ferrioxalate compositions useful as calibrants Aqueous ferrioxalate compositions useful as calibrants

1989-02-03

1991-12-03

Lacey, David L.

Chemistry: analytical and immunological testing

Composition for standardization, calibration, simulation,...

436 11, 436 19, G01N 3100

Patent

active

050700235

ABSTRACT:
Aqueous acidic ferrioxalate compositions are disclosed for use as calibrants of pCO2 and of PO2 after photodecomposition. Compositions with high iron(III) to oxalate molar ratios (e.g., 5:1 to 100:1 with 0.3 to 15 millimolar oxalate) produce carbon dioxide on exposure without oxygen consumption. Compositions with low iron(III) to oxalate ratios (e.g., 1:100 to 1:2000) with 0.1 to 5 millimolar iron(III) produce carbon dioxide on exposure with concurrent oxygen consumption. Use of the two types of compositions enables calibration values to be established with varying pCO2 values and with, respectively, high and low pO2 values.

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