光谱学与光谱分析 |
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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 |
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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.
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Received: 2011-12-15
Accepted: 2012-03-16
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Corresponding Authors:
REN Zhao-yu
E-mail: rzy@nwu.edu.cn
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