Determination of trace chlorine in tap water by energydispersive X-ray fluorescence spectrometry
CHENG Da-wei1,2, NI Zi-yue1, LIAO Xue-liang2, LIU Ming-bo2 CHEN Ji-wen3, JIA Yun-hai*1,2
1. Central Iron & Steel Research Institute, Beijing 100081, China; 2. NCS Testing Technology Co., Ltd.,Beijing 100081, China; 3. School of Electrical and Control Engineering, North China University ofTechnology, Beijing 100144, China
Abstract：The content of trace chlorine in tap water was determined by energy dispersive X-ray fluorescence spectrometry in atmospheres of air, nitrogen and helium, respectively. The results showed that the helium atmosphere could not only eliminate the interference of argon in air, but also enhance the spectral peak intensity of chlorine received by detector. Therefore, the helium atmosphere was selected to determine trace chlorine in tap water by energy dispersive X-ray fluorescence spectrometry. The relationship between peak-to-background ratio and X-ray tube voltage and tube current was studied. The optimal working conditions were obtained as follows: the tube voltage was 15kV and the tube current was 800μA. When the mass fraction of chlorine was in range of 0-200μg/mL, it had linear relationship to the corresponding X-ray fluorescence relative intensity with linear correlation coefficient of R2=0.9975. The detection limit was 2.94μg/mL. The content of chlorine in standard solution (30μg/mL and 10μg/mL) was determined according to the experimental method. The relative standard deviation (RSD, n=11) was 11% and 16%, respectively. Two actual tap water samples were used for recovery tests. The spiked recoveries were between 89% and 119%.
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