1. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：The trace elements, Ca, Mg, Ba, Co, Cd, Cu, Mn, Pb, Sr, Zn, Al, Fe, Ni, Ti, Si and V, in K2CrO4 were simultaneously determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Optimum spectral lines were selected for each analyzed element. The matrix effect was studied and eliminated through matrix matching. The results show that the linear correlations of standard curves are good (R2=0.998 6-1.000) under the determined conditions. The recoveries of standard addition are in the range of 83.7%-113.0%, and the relative standard deviations are lower than 9.48％(n=9). Detection limits of these impurities are in the range of 0.075-2.625 mg·kg-1. The method is rapid, simple, accurate and credible, so it can be used for the determination of impurities in K2CrO4 product. The results also show that there is relatively high content of Ca, Mg, Al and Si in K2CrO4 product, so the K2CrO4 product can’t be directly used for the ion membrane electrochemical synthesis of chromic anhydride and the product must be taken for further purification.
[1] LI Cheng-wei, YU Zhi-hui, QI Tao, et al(李成未，余志辉，齐 涛，等). Journal of Chemical Industry and Engineering(化工学报)， 2006，57(1):71. [2] ZHANG Yi, LI Zuo-hu, QI Tao, et al(张 懿，李佐虎，齐 涛, 等). Acta Chimica Sinica(化学学报)，1999，57(3):258. [3] CHENG Dian-bin(程殿彬). Production Technique of Manufacturing Alkali by Ion-Exchange Membrane(离子膜法制碱生产技术). Beijing: Chemical Industry Press(北京:化学工业出版社)，1998. [4] DONG Yin-gen, SHEN Hui-jun, SHEN Zhi-wu(董银根，沈惠君，沈志武). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2002，22(1):161. [5] SUN Jing, XU Li-hua(孙 晶，徐丽华). China Pharmacist(中国药师)，2006，9(11):1009. [6] LIU Li-xing, LI Zhuo(刘立行，李 卓). Chinese Journal of Analysis Laboratory(分析试验室)，2004，23(1): 46. [7] QIN Yan, DONG Wei, GE Xin(秦 岩, 董 薇，葛 欣). Chinese Journal of Spectroscopy Laboratory(光谱实验室)，2005，22(2): 287. [8] GONG Xiao-feng, CHEN Chun-li, ZHAO Jin，et al(弓晓峰，陈春丽，赵 晋，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2007，27(8): 1634. [9] Thompson M，Walsh JN(M汤姆逊，J N沃尔什). A Handbook of Inductively Coupled Plasma Spectrometry(ICP光谱分析指南). Beijing： Metallurgical Industry Press(北京:冶金工业出版社), 1991. [10] Boss Charles B，Fredeen Kenneth J.Concepts Instrumentation and Techniques in Inductively Coupled Plasma Optical Emission Spectrometry, Norwalk: The Perkin-Elmer Corporation, 1999. 36.
