丁二酮肟光度法测定镍矿中的镍

Determination of Nickel in Nickel Ore by Dimethylglyoxime Photometry

试样在铂金坩埚以氢氟酸、硝酸溶解后,加高氯酸冒烟驱除去硅和氟,以稀盐酸溶解盐类,定容。移取部分试液,加酒石酸钾钠掩蔽铁、铝等干扰元素,以氢氧化钠溶液调节试液pH≥12,在氧化剂过硫酸铵存在下的pH≥12碱性介质中镍与丁二酮肟生成1∶3的可溶性的酒红色络和物,测定吸光度以求得镍量。

The sample was dissolved with hydrofluoric acid and nitric acid in a platinum crucible, perchloric acid was added to make smoke rise to remove silicon and fluorin and dilute hydrochloric acid was used to dissolve salt and make it constant-volumed. Parts of test solution was taken and sodium-potassium tartrate was added to mask the disturbing elements like iron and aluminium, then sodium hydroxide solution was used to adjust the solution at PH≥ 12 and in the alkaline medium of PH≥ 12 in the presence of the oxidant ammonium persulphate, nickel and dimethylglyoxime form 1 ： 3 soluble wine - red complex, the absorbency of which was determined to find out the content of nickel.