An indicator composition for detecting the presence of glutaraldehyde in wash water at concentrations of about 5 to about 20 ppm, comprises a sulphite and a pH indicator where the pH indicator is cresolphthalein. The ratio of sulphite to cresolphthalein is about 3:1 to about 5:1, and the composition is used in an amount such that the concentration of sulphite in the glutaraldehyde wash solution to be tested is about 0.6 mg.ml⁻¹ to about 1.4 mg.ml⁻¹.
一种用于检测洗涤
水中
戊二醛存在的指示剂组合物,浓度约为 5 至 20 ppm,由
亚硫酸盐和 pH 指示剂组成,其中 pH 指示剂为
酚酞。
亚硫酸盐与
石炭酸的比例约为 3:1 至约 5:1,组合物的使用量为:待测
戊二醛洗涤液中
亚硫酸盐的浓度约为 0.6 毫克.毫升-¹至约 1.4 毫克.毫升-¹。