本文研究了用硝酸钙作盐析剂EDTA为辂合剂以丁酮一次萃取铀试剂显色测定复杂试样中铀的光度法。此法特点是操作快、误差小。根据试验拟订了具体操作方法,按照具体操作方法操作,相对误差在2-3％之间。在文献中韶载有一系列以生色团作用测定少量灿的方法。这些方法级有足够的选择性,但其灵敏度均不够高 In this paper, the use of calcium nitrate as a salting-out agent EDTA as a mixture of acetone butant ketone extraction uranium reagent colorimetric determination of uranium in complex samples spectrophotometry. This method is characterized by fast operation, small error. According to the test developed a specific method of operation, in accordance with the specific method of operation, the relative error of 2-3%. In the literature there is a series of methods that measure the small amount of light by the action of the chromophore. These method levels are sufficiently selective, but their sensitivity is not high enough