本工作研究了用自制的FIA-铀、镎、钚测定仪测定微量铀的方法。该方法也适用于一般流动注射分析系统。采用偶氮胂Ⅲ作显色剂,以DCTA作掩蔽剂,一氯乙酸——氯乙酸钠为缓冲液,可直接测定后处理工艺溶液中多个分析点的铀含量。在[Zr~(4+)]/[UO_2~(2+)] This work has studied the method of measuring trace uranium with the homemade FIA-uranium, uranium and plutonium detector. This method is also suitable for general flow injection analysis systems. Arsenazo Ⅲ was used as a chromogenic reagent, DCTA as a masking agent, and monochloroacetic acid-sodium chloroacetate as a buffer were used to directly determine the uranium content of several analytical points in the aftertreatment solution. In [Zr ~ (4 +)] / [UO_2 ~ (2+)]