【摘要】 提出了红土镍矿中镍量的酸溶-丁二酮肟分光光度测定法。试样经混酸(盐酸+硝酸+氢氟酸)溶解,高氯酸冒烟。在氢氧化钠介质中,以过硫酸铵作氧化剂,使镍与丁二酮肟生成可溶性的酒红色络合物,于460nm波长处进行镍的光度法测定。将该法应用于含镍量不同的9个红土镍矿样品中镍的测定,相对误差(RSD)为1.10%～3.78%(n=11),加标回收率在98.5%～101.5%之间,与其他3个实验室测定结果以及不同分析方法(过氧化钠碱熔-丁二酮肟光度法、AAS法和ICP-AES法)的测定结果一致。更多还原

【Abstract】 Nickel content in laterite nickel ores was determined by acid digestion-dimethylglyoxime photometric method.Samples were dissolved with mixed acid of HCl-HNO3-HF,and then made through perchloric acid smoke.In sodium hydroxide medium,with ammonium persulfate as oxidant,a soluble wine-red complex was formed through the reaction of nickel and dimethylglyoxime.Nickel content was determined at 460 nm wavelength.The proposed method was applied to determine the nickel content in 9 samples of different laterite nickel ores.The relative deviation(RSD) was between 1.10%～3.78%,and the recovery was in the range of 98.5%～101.5%.Compared with that of other three laboratories and three different methods including sodium peroxide fusion-dimethylglyoxime spectrophotometry,AAS and ICP-AES,the results were consistent.更多还原