Abstract：The sample was digested by aqua regia in oven at 180 ℃ for 12 h. Then, 10 mL of 100 g/L lanthanum chloride solution and 10 mL of 100 g/L copper sulfate solution were added as releasing agent. Consequently, iridium in platinum-iridium alloy was determined by flame atomic absorption spectrometry (FAAS). The results showed that, the concentration of iridium in the range of 15-100 μg/mL exhibited good linear relationship to the absorbance. The linear regression equation was A=0.000 83ρ+0.001 5 with correlation coefficient of 0.999 5. The detection limit of method was 0.002 8 μg/mL. This method was applied to the determination of iridium in Pt25Ir and Pt10Ir samples, and the recovery test was conducted by addition of iridium standard solution. The relative standard deviation (n=11) was 1.6 % and 2.3 %, respectively. The recoveries were between 95% and 101%.
石新层，杨军红，李海燕，刘厚勇. 火焰原子吸收光谱法测定铂铱合金中铱[J]. 冶金分析, 2013, 33(9): 46-48.
SHI Xin-ceng,YANG Jun-hong, LI Hai-yan, LIU Hou-yong. Determination of iridium in platinum iridium alloy by flame atomic absorption spectrometry. , 2013, 33(9): 46-48.
