Qualitative and quantitative processes for reactive chemicals in

Details Qualitative and quantitative processes for reactive chemicals in Qualitative and quantitative processes for reactive chemicals in

1992-09-30

1994-12-06

Housel, James C.

Chemistry: analytical and immunological testing

Metal or metal containing

436 84, 436163, 436164, 436165, 436169, 422 59, G01N 3320

Patent

active

053710185

ABSTRACT:
A process for qualitative or quantitative determination of a reactive chemical contained in a liquid sample by forming doped sol-gel glass pellets from a metal alkoxide, arranging the porous doped sol-gel glass pellets in a glass tube, contacting a liquid sample containing a reactive chemical with the porous doped sol-gel glass pellets contained in the glass tube, and measuring a length of a stained portion of the glass tube resulting from a color change in the sol-gel glass pellets. The sol-gel glass pellets are formed by a gelling step conducted at room temperature in the presence of a colorimetric reagent dopant which produces a color change in the presence of the reactive chemical, and a drying step conducted at not greater than 41.degree. C. The doped sol-gel glass pellets contain the colorimetric reagent dopant encapsulated therein and the encapsulated colorimetric reagent dopant is color changeable in the presence of the reactive chemical in the pores of the doped sol-gel glass pellets.

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