抄録
A spectrophotometric method is critically examined for the determination of microgram quantities of nickel in uranium with dimethlyglyoxime. Nickel is determined spectrophotometrically after extracting its dimethylglyoxime complex with chloroform. The outline of the procedure is as follows.
An approximately 30 ml of acid sample solution containing not more than 2.5 g of uranium and 150 μg of nickel, is treated with 10 ml of 30% ammonium citrate solution, 1 ml of 1% dimethylglyoxime solution (1 g in 100 ml of 95% ethanol) and proper amount of ammonium hydroxide to adjust the pH to 8.8 to 10, and the volume is brought to 50 ml. Then, the nickel complex is extracted with exactly 10 ml of chloroform, and the absorbance of the extract is measured at 375 mμ using a blank as reference.
By this method, as small as 5 μg of nickel in 2.5 g of uranium can be determined rapidly and accurately. The method provides for the presence of other metals.
