本文描述了海洋环境中低水平~(241)Am测定的放射化学程序的改进。即应用DDCP[2-丁基-N,N-2乙基氨基甲酰磷酸]萃取镅以代替以前的HDEHP[2-2乙基已基磷酸)萃取镅。原程序用HDEHP萃取镅并结合硝酸-甲醇介质进行阴离子交换。其中HDEHP萃取是镅回收率的关键一步。原程序中溶液的pH应控制在2～3,即使pH控制严格,某些样品,尤其是沉积物样,在此pH范 This article describes the improvements in radiochemical procedures for the low-level ~ (241) Am determination in the marine environment. In other words, DDCP [2-butyl-N, N-2 ethylcarbamoyl phosphate] should be used instead of the former HDEHP [2-ethylhexylphosphoric acid] for extraction. The original program extracted with HDEHP 镅 combined with nitric acid - methanol medium for anion exchange. Among them, HDEHP extraction is a key step in the recovery rate. The original program solution pH should be controlled at 2 to 3, even if the pH control is strict, some samples, especially sediment-like, at this pH range