Micro analytical method, sampling plate used in same, method of

Details Micro analytical method, sampling plate used in same, method of Micro analytical method, sampling plate used in same, method of

1992-09-30

1994-08-02

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

G01N 2101, G01N 2135

Patent

active

053348370

ABSTRACT:
Microanalytical methods and associated apparatus for detecting and quantifying organic compounds with very high sensitivity utilize reflected or refracted infrared radiation. By depositing microliter sized quantities of the sample containing solution in a drop-by-drop manner on a water-repellent thin film and rapidly evaporating a solvent, a coherently condensed concentric sample is produced having enhanced sample thickness. This sample is irradiated with infrared radiation which is either reflected or transmitted by the material underlying the thin film. Measuring the spectrum of the infrared radiation passing through the sample detects the existence and concentration of the organic compound. The water-repellent thin film may be provided with multiple small scale depressions, pinholes or zones of reduced surface tension for condensing the sample.

REFERENCES:
patent: 4823009 (1989-04-01), Biemann et al.

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