Abstract：During the determination of cadmium in mixture containing zinc by inductively coupled plasma atomic emission spectrometry (ICP-AES), the coexisting elements in sample solution such as lead and zinc had obviously positive interference with determination of cadmium if the impurities were not separated. The sample was digested with hydrochloric acid and nitric acid. After full complexation cadmium ions with potassium iodide solution, the complexed cadmium ions were selectively adsorbed with 0.2 g of strong alkaline anion exchange fiber(SBAEF), realizing the complete separation of cadmium from other impurity elements. Then, in the weak alkaline medium at pH 8, the adsorbed cadmium ions were eluted with 0.05 mol/L EDTA solution at 30 ℃ for 30 min. The eluted cadmium was determined by ICP-AES. Consequently, a determination method of cadmium in mixture containing zinc was established by ICP-AES after strong alkaline anion exchange fiber absorption. The mass concentration of cadmium in range of 0.2-1.0 μg/mL was linear to its corresponding emission intensity. The linear correlation coefficient of calibration curve was R2=0.999 8. The detection limit and low limit of determination was 0.032×10-6(mass fraction, similarly hereinafter) and 0.13×10－6, respectively. The content of cadmium in four actual samples of mixture containing zinc was determined according to the experimental method. The relative standard deviations (RSD, n=11) were between 0.87% and 1.6%. The recoveries were between 97% and 102%.
王晓.FAAS法连续测定锌精矿中铜、铅、镉[J].昆明理工大学学报:理工版,2003,28(5):127-129.WANG Xiao.Flame atomic absorption photometric method to determine copper and lead and cadmiumin zinc concentrate successively[J]. Journal of Kunming University of Science and Technology:Science and Technology,2003,28(5):127-129.
刘新,陈卫中,贾皓,等.火焰原子吸收光谱法测定铅锌矿尾矿矿渣中镉和铬[J].冶金分析,2012,32(9):30-35.LIU Xin,CHEN wei-zhong,JIA Hao,et al. Determination of cadmium and chromium slag in lead-zinc tailings by flame atomic absorption spectrometry[J].Metallurgical Analysis,2012,32(9):30-35.
[4]
郑忠勤.原子吸收分光光度法测定锌基合金中铜、镁、铅、镉、铁[J].有色矿冶,2005,21(3): 49-51.ZHENG Zhong-qin.Measuring Cu,Mg,Pb,Cd and Fe in cast alloy by atomic absorption spectrophptometry[J].Non-ferrous Mining and Metallurgy,2005,21(3): 49-51.
[5]
赵晶晶.电感耦合等离子体发射光谱法测定锌精矿、锌矿石、铅锌混合矿中的锌、铜、砷、铅、镉含量[J].现代仪器与医疗,2013,19(6):55-56.ZHAO Jing-jing.Rapid method for determination of zinc,copper,arsenic,lead and cadmium in fine zinc ores,zinc ores and lead-zinc ores—inductively coupled plasma spectrometry (ICP-AES) method[J].Modern Instrument and Medical Treatment,2013,19(6):55-56.
[6]
程键.电感耦合等离子体原子发射光谱法测定锌精矿及焙砂中10种杂质元素[J].冶金分析,2007,27(11):65-68.CHENG Jian.Detemination of ten impurity elements in zinc concentrate and zinc calcine by inductively coupIed plasma atomic emission spectrometry[J].Metallurgical Analysis,2007,27(11):65-68.
[7]
康俊,杨春茹,高建文,等.王水提取-电感耦合等离子体质谱法测定煤中微量银和镉[J].煤质技术,2013(5):23-26.KANG Jun,YANG Chun-ru,GAO Jian-wen,et al.Determination of silver and cadmium in coal samples by inductively coupled plasma-mass spectrometry with aqua regia sample digestion[J].Goal Quality Technology,2013(5):23-26.
[8]
田琼,张文昔,宋嘉宁,等.波长色散X射线荧光光谱法测定锌精矿中主次量成分[J].岩矿测试,2012,31(3):463-467.TIAN Qiong,ZHANG Wen-xi,SONG Jia-ning,et al.Determination of major and minor components in zinc concentrate by wavelength dispersive-X-ray fluorescence spectrometry[J].Nock and Mineral Analysis,2012,31(3):463-467.
[9]
潘雪珍,龚琦,韦小玲,等.强酸阳离子交换纤维柱分离-石墨炉原子吸收光谱法测定金属铟及其盐中镉[J].冶金分析,2010,30(4):9-13.PAN Xue-zhen,GONG Qi,WEI Xiao-ling,et al.Separation with strong acid cation exchange fiber column for the determination of cadmium in metallic indium and its salt by graphite furnace atomic absorption spectrometry[J].Metallurgical Analysis,2010,30(4):9-13
