MONOLITHIC MULTILAYERED ANALYZING MATERIAL FOR ANALYSIS OF AMMONIA OR AMMONIA FORMING SUBSTRATE AND DETECTING METHOD FOR SAID SUBSTRATE

摘要

PURPOSE:To obtain a monolithic multilayered analyzing material having high sensitivity and high accuracy providing a liquid shielding layer consisting of a woven meterial or the like which permits the transmission of gaseous ammonia but does not permit the transmission of liquid between an indicator layer and a reagent layer in lieu of conventional permselective layers. CONSTITUTION:An indicator layer contg. such a compd. which produces a change in absorption wavelength by reacting with gaseous ammonia such as, for example, a leucocyanine dye is provided on hydrophobic transparent backing of, for example, polyethylene terephthalate or the like. A woven material such as broadcloth, ''Bemberg '' broadcloth, which is substantially free from capillarity by water is provided on said indicator layer at 30-300mum thickness and =20% voids. In the case of a hydrophilic material, the layer is subjected to a water repelling treatment with silicone oil or the like. A reagent such as urease which forms ammonia by reacting with ammonia forming substrates is provided on such liquid shielding layer via a binder. Thus, the diffusion speed of gaseous ammonia is increased by the presence of the air layers and the time for measurement is markedly reduced.