本规范涵盖了从推进剂系统中回收的四氧化二氮（N2O4）溶液，也称为氧化剂溶液（OS）的要求。N2O4溶液实际上是N2O4、硝酸（HNO3）和水（H2O）的混合物。本规范提供了一种对回收的推进剂进行分类的方法，用于回收以备替代再利用或再加工至原始制造纯度。

This specification covers the requirement for nitrogen tetroxide (N2O4) solution, also known as oxidizer solution (OS) recovered from propellant systems. N2O4solution is actually a blend of N2O4, nitric acid (HNO3), and water (H2O). This specification provides a means of categorizing recovered propellants for either reclamation for alternate reuse or for reprocessing to original manufacturing purity.