流动注射分光光度法测定有机相中铀的研究

DETERMINGTION OF URANIUM IN ORGANIC PHASE BY FlOW INJECTION SPECTROPHOTOMETRIC ANALYSIS

使用流动注射分光光度法，以合并带流路模拟有机相铀标准系列溶液，从而求出未知有机相样品的铀含量。测定范围在10～200mg／L.时铀浓度与吸光度呈线性关系。载流溶液为异丙醇，混合显色剂组分为异丙醇、三乙醇胺、Br－PADAP和掩蔽剂。方法的相对标偏＜±5％。每次样品的测定速度为1min。本法具有3个特点：1）采用合并带模拟有机相铀的标准系列溶液，使测定方法的灵敏度高、准确性好;2）即使在少量混浊状态下也能进行定量测定;3）采用排带法，解决了蠕动泵管长期使用的问题。

Based on the use of merging zone circuit and simulating a series of standard solution of uranium in organic phase,uranium in unknown organic phase sample was determined by flow injection spectrophotometry. A linear calibration graph was obtained with correlation coefficient of 0. 999 for uranium concentration in organic phase over 10～200 mg/L. Isopropyl alcohol was used as carrier solution. Mixing colour solution contains isopropyl alcohol,triethanolamine, masking reagent and Br-PADAP. The relative standard deviation of the method wus better thane±5 %. Determination of each sample can be completed in one minute.The method characteristic is: (1) using merging zone and simulating standard solution of uranium in organic phase, the method is sensitive and reliable; (2)even if the determined solution was in turbid condition,it can be quantitatively determined; (3)by means of solution replace technique,the tube of peristaltic pump can be used over a long period of time.