Preconcentration of Ultra-Trace As(Ⅲ) in Water Samples with Nano-Sized ZnO and Determination by HGAFS with Colloid Sampling
PENG Hong1, ZHANG Xu2*
1. School of Water Resources and Hydropower, State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China 2. School of Resources and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental, Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China
Abstract：When the pH values of solution were 6.5～7.5, the adsorption efficiency of nano-sized ZnO for As(Ⅲ) was higher than 99.5% in 10 min shaking. Based on the high adsorption capacity of As(Ⅲ) onto nano-sized ZnO and the good solubility of ZnO in acidic solution, a novel method for preconcentration of ultra-trace As(Ⅲ) by using ZnO was presented in the present work. After preconcentration and centrifugation, the supernatant fluid was removed. The sediment which contained the concentrated As(Ⅲ) was dissolved in HCl solution and the concentration was analyzed by hydride generation atomic fluorescence spectrometry (HGAFS). The proposed method possesses low detection limit (3σ) (0.075 μg·L-1) and good precision (the relative standard deviation (RSD) is 1.6%, n=6). The recovery rate for the analyzing of aquatic samples is between 97.0% and 104.5%. The results show that the method is simple, time saving and high sensitive.
彭 虹1，张 旭2* . 纳米氧化锌分离富集—氢化物原子荧光光谱法测定水中超痕量砷 [J]. 光谱学与光谱分析, 2013, 33(03): 822-825.
PENG Hong1, ZHANG Xu2* . Preconcentration of Ultra-Trace As(Ⅲ) in Water Samples with Nano-Sized ZnO and Determination by HGAFS with Colloid Sampling. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(03): 822-825.
[1] Fendorf S, Michael H A, van Geen A. Science, 2010, 328(5982): 1123. [2] Qian S, Huang Z, Fu J, et al. Analytical Methods, 2010, 2(8): 1140. [3] Latva S, Hurtta M, Perniemi S, et al. Analytica Chimica Acta, 2000, 418(1): 11. [4] QIAN Sha-hua, WEI Jin-bao(钱沙华，韦进宝). Environmental Instrument Ananlysis, Second Edition.(环境仪器分析，第2版). Beijing: China Environmental Science Press(北京：中国环境科学出版社)，2011. [5] Xiao Y, Ling J, Qian S, et al. Water and Environment Research, 2007, 79(9): 1015. [6] Chen D, Huang C, He M, et al. Journal of Hazardous Materials, 2009, 164(2-3): 1146. [7] Chen X W, Zou A M, Chen M L, et al. Analytical Chemistry, 2009, 81(3): 1291. [8] FANG Lan-yun, ZHENG Yan, WANG Li, et al(方兰云，郑 艳，王 立，等). Chinese Journal of Health Laboratory Technology(中国卫生检验杂志), 2012, 22(5): 987. [9] Jitmanee K, Oshima M, Motomizu S. Talanta, 2005, 66(3): 529. [10] Liang P, Liu R. Analytica Chimica Acta, 2007, 602(1): 32. [11] Huang C, Hu B, Jiang Z. Spectrochimica Acta Part B: Atomic Spectroscopy, 2007, 62(5): 454. [12] Xiong C, He M, Hu B. Talanta, 2008, 76(4): 772. [13] Sitko R, Zawisza B, Malicka E. TrAC, Trends in Analytical Chemistry, 2012, 37: 22.
