测定铍青铜中皱的方法有EDTA存在下,使铍成氢氧化铍沉淀或铜铁试剂沉淀,最后以氧化皱称重或称量铜铁试剂铍,但重量法速度慢。目前工厂中多用比色法,例如皱试剂Ⅱ或Ⅲ、铝试剂、铬青R、铬天青S比色法等。本法利用铬天青S与铍在pH9～10生成极为稳定的红色溶合物比色测定铍。铍与铬天青S反应的酸度范围较宽,pH2.5～11都能反应,但不同pH形成的络合物的吸收不一样,目前大多数采用pH5左右的微酸性溶液,因为pH再小试剂本身空白值太大,pH再大灵敏度降低。我们发现在微酸性条件下各种试剂对显色液的吸光度影响很大,尤其用来掩蔽其它干扰元素的EDTA溶液随 Determination of beryllium wrinkles in the presence of EDTA, the beryllium hydroxide beryllium hydroxide precipitation or precipitation of copper and iron reagents, and finally to the oxidation of wrinkles weighing or weighing copper and iron reagent beryllium, but gravimetric slow. At present the factory colorimetric method, such as wrinkle reagent Ⅱ or Ⅲ, aluminum reagent, chrome green R, chrome Azure S colorimetric method. This method uses chrome azure S and beryllium at pH9 ~ 10 to generate extremely stable red colorimetric determination of beryllium. Beryllium and azurol S reaction of a wide range of acidity, pH2.5 ~ 11 can react, but the absorption of complexes formed by different pH is not the same, most of the current use of slightly acidic pH5 solution, because the pH is smaller Reagent itself blank value is too large, pH and then reduce the sensitivity. We found that under slightly acidic conditions, various reagents have a great influence on the absorbance of the color developing solution, especially for masking other disturbing elements in the EDTA solution