引言 ECP-2工艺的前定影液被显影液带入的柯达彩色显影剂CD-2污染,将在胶片上引起品红色污斑。本文介绍的方法可以测定少量带入前定影液中的CD-2。原理将一份定影液样液调整至碱性(pH9.0以上),并用氯仿提取CD-2。然后将氯仿中的CD-2提取到稀酸液中,并用硫酸铈进行滴定,以试亚铁灵作指示剂。 Introduction Pre-fixes for the ECP-2 process are contaminated with Kodak Color Developer CD-2, which is carried by the developer solution, causing magenta stains on the film. The method described here allows the determination of a small amount of CD-2 taken into the pre-fixer. Principle One sample solution was adjusted to basic (pH 9.0 or higher) and CD-2 was extracted with chloroform. The CD-2 in chloroform was then extracted into dilute acid and titrated with cerium sulfate to test ferrimagine as an indicator.