Film badge for determining carbonyl compounds
AssigneeArthur D. Little, Inc.
InventorMartin Koocher
Life of this patent
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Abstract
Method for the determination of fluidic-contained aldehydes. The method comprises bringing into contact said aldehyde and a chemically inert substrate having adhered to the surface thereof a substantially monodisperse system of particles of a derivatizing agent for the aldehydes thereby forming nucleating crystals; treating said nucleating crystals with a metastable supersaturated solution in which said nucleating crystals can grow; growing said nucleating crystals to form an optically measurable film of crystals; and optically measuring said film of crystals to determine the concentration of fluidic-contained aldehydes.
Claims10
A method for determining fluidic-contained aldehyde comprising
- a. contacting a chemically inert substrate having adhered to the surface thereof a substantially monodisperse system of particles of a derivatizing agent for the aldehyde with the fluidic-contained aldehyde to form nucleating sites;
- b. treating said nucleating sites with a metastable supersaturated solution in which said nucleating sites can grow;
- c. growing said nucleating sites to form an optically measurable film of crystals;
- and
- d. optically measuring said film of crystals to determine the concentration of fluidic-contained aldehyde.
A film badge useful for determining the presence or time-average amounts of fluidic-contained aldehyde comprising a container having a chamber therein, said chamber enclosing a chemically inert substrate having adhered to the surface thereof a substantially monodisperse system of particles of a derivatizing agent for said aldehyde, the size of said particles being in the micron to submicron range, and superimposed on said chamber and said substrate a porous fluid flow attenuating layer, said porous fluid flow attenuating layer causing the flow of said fluidic-contained aldehyde to contact said substrate layer to form nucleating sites for crystal growth.
A method for determining a fluidic-contained carbonyl compound comprising
- a. contacting a chemically inert substrate having adhered to the surface thereof a substantially monodisperse system of particles of a derivatizing agent for the carbonyl compound with the fluidic-contained carbonyl compound to form nucleating sites;
- b. treating said nucleating sites with a metastable supersaturated solution in which said nucleating sites can grow;
- c. growing said nucleating sites to form an optically measurable film of crystals;
- and
- d. optically measuring said film of crystals to determine the concentration of fluidic contained carbonyl compound.
Dependencies are inferred from the claim text.