Characteristics of Rubidium Forward Degenerate Four-Wave Mixing (FDFWM) Influenced by the Matrix Effect of Chloride Brine in Graphite Furnace
WANG Jian1, 2, REN Zhao-yu1*, CHENG Xue-mei1, MIAO Yi-zhu1, CHEN Hao-wei1, YIN Xun-li1, WANG Li-qin2, BAI Jin-tao1
1. National Key Laboratory of Photoelectric Technology and Functional Materials, National Photoelectric Technology, and Functional Materials and Application of Science and Technology International Cooperation Center, Department of Physics, Northwest University, Xi’an 710069, China 2. School of Cultural Heritage, Northwest University, Xi’an 710069, China
Abstract：Rb is mainly extracted from brine. The authors studied the matrix effect of chloride brine (NaCl,CaCl2,KCl and MgCl2) on FDFWM (Forward phase-matching degenerate four-wave mixing) of Rb in the graphite furnace. The Rb and other chloride brine concentrations dependences of FDFWM were investigated respectively. The results indicate that with the increase in Rb concentration, FDFWM increases and reaches the highest at 80 ng·mL-1. With the concentration of Rb sample further increasing, the FDFWM intensity drops. It was also found that when the Rb concentration is low, FDFWM signal is suppressed by the chloride brine, and the suppressing effect gets stronger with the increase in the chloride brine concentration. However, when the Rb concentration is high, FDFWM signal is first enhanced and then suppressed with the increase in the chloride brine concentration. The Cl- interference and Rb ionization in the graphite furnace were employed to explain the experimental results. This work is of important meaning in extracting and analyzing Rb in brine.
[1] ZHANG Bo, XIANG Li-ren(张 波，向立人). Chinese Journal of Analytical Chemistry(分析化学), 1999, 27(6): 661. [2] SHI Chun-yan, WEI Rong, LI Tang, et al(史春艳，魏 荣，李 唐，等). Scientia Sinica Physica, Mechanica & Astronomica(中国科学：物理学 力学 天文学), 2011, 41(5): 611. [3] MOU Shi-fen, LIU Ke-na(牟世芬, 刘克纳). Ion Chromatography Method and Application(离子色谱方法及应用). Beijing：Chemical Industry Press(北京：化学工业出版社), 2000. 271. [4] WANG Chun-ye, WANG Hai-zhen, DU Gui-rong(王春叶, 王海珍, 杜桂荣). Chemical Analysis and Meterage(化学分析计量), 2010, 19(2): 81. [5] FAN Xing-tao, ZHAN Xiu-chun, GONG Ai-hua(樊兴涛, 詹秀春, 巩爱华). Rock and Mineral Analysis(岩矿测试), 2003, 23(1): 15. [6] Kekedy-Nagy L, Cordos E A. Talanta, 2000, 52(4): 645. [7] Tong W G, Chen D A. Applied Spectroscopy，1987, 41(4): 586. [8] Wu Z Q, Liu J Y, Tong W G. Spectrochimica Acta, 1994, 49B(13-14), 1483. [9] Ron Briggs, Julia Schafer, Wendy Lyons, William G. Tong. Proc. of SPIE, 2004, 5686: 54. [10] SHI Shun-xiang, CHEN Guo-fu, ZHAO Wei, et al(石顺祥，陈国夫，赵 卫，等). Nonlinear Optics(非线性光学). Xi’an: Xidian University Press(西安：西安电子科技大学出版社), 2007. 222. [11] SUN Han-wen(孙汉文). Atomic Spectrum Analysis(原子光谱分析). Beijing: Higher Education Press(北京：高等教育出版社), 2002. 145. [12] SUN Han-wen(孙汉文). Atomic Spectrum Analysis(原子光谱分析). Beijing: Higher Education Press(北京：高等教育出版社), 2002. 250.
