A method of preparing an integral multilayer analytical element such as for analysis of calcium comprising a water-impermeable light-transmissive support, a reagent layer containing a water-soluble indicator capable of reacting with an analyte to produce an optically detectable change, and a porous spreading layer containing a spreading action controller and/or an acid capable of decomposing the calcium compounds in a sample, superposed in this order, which is characterized in that dissolving the spreading action controller and/or the acid in an organic solvent which does not dissolve the above water-soluble indicator, incorporating this solution into the porous spreading layer, and drying this superposed material.
一种制备整体多层分析元件(如用于
钙分析)的方法,该元件包括一个透光的不透
水支撑层,一个试剂层,该试剂层含有一个能与被分析物反应产生光学可检测变化的
水溶性指示剂,以及一个多孔铺展层,该多孔铺展层含有一个铺展作用控制剂和/或一个能分解样品中
钙化合物的酸,这些试剂层依次叠加,其特征在于:将铺展作用控制剂和/或酸溶解在一个不溶解上述
水溶性指示剂的有机溶剂中,将该溶液加入多孔铺展层中,并干燥该叠加材料。