A method for the determination of Ni, Co and Cu contents in laterite is presented in this paper. Laterite samples were fused with a mixed flux of Na2CO3-Na2B4O7, then the analytes were extracted by HC1 acid. The sample solution was measured by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The internal standard method was used to avoid matrix interference based on choosing Y 371. 030 nm as the internal calibration line for Cu (324.754 nm) and Y 224.306 nm for Ni (231.604 nm) and Co (228.616 nm). The detection limits for Ni, Co and Cu were 0. 5 μg/g, 1.0 μg/g and 1.0 μg/g, respectively. The relative standard deviations (RSD) of the test result were 1. 2% -2. 0% (n =7) , and the recoveries ranged from 95% to 103.6%, which met the requirements of analysis for laterite.%红土镍矿样品用无水Na2 CO3 - Na2 B4 O7混合熔剂熔融,HCl浸出酸化,电感耦合等离子体发射光谱法直接测定样品中镍、钴、铜的含量.Cu 324.754 nm使用Y 371.030 nm作为内标线,Ni 231.604 nm、Co 228.616 nm使用Y 224.306 nm作为内标线校正基体干扰,方法检出限镍为0.5μg/g、钴为1.0 μg/g、铜为1.0μg/g,相对标准偏差( RSD,n=7)为1.2％ ～2.0％,加标回收率为95.0％ ～ 103.6％,能满足红土镍矿的分析要求.
展开▼
