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Determination of trace total inorganic arsenic by hydride generation atomic fluorescence spectrometry after solid phase extraction-preconcentration on aluminium hydroxide gel |
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| Authors: | Fang Deng Ruizhi Dong Kai Yu Xubiao Luo Xinman Tu Shenglian Luo Lixia Yang |
| Institution: | 1. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China 3. College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, 330063, People’s Republic of China 2. Institute of Wastes and Soil Environment, Shanghai Academy of Environmental Sciences, Shanghai, 200233, China |
| Abstract: | We describe a simple, effective, inexpensive and rapid method for the determination of trace amounts of total inorganic arsenic in water samples by means of a modified solid phase preconcentration procedure using an aluminium hydroxide gel sorbent and hydride generation atomic fluorescence spectrometry (HGAFS). This method avoids the traditional extraction procedures that are time- and solvent-consuming. The effects of quantity of adsorbent, solution pH, adsorption time and potentially interfering ions were studied. Under the optimal conditions, the detection limit is 3 ng?L?1, and the enrichment factor is 167. The calibration plot is linear in the range from 0.05 to 10 μg?L?1, with a correlation coefficient of 0.9992. The relative standard deviation (RSD) was less than 6.1 % (n?=?5) and recoveries in spiked environmental water were >100 %. The method was successfully applied to the determination of total inorganic arsenic in natural water samples. The above figure showed effect of adsorption time on recoveries of total inorganic arsenic. The adsorption rate of total inorganic arsenic on is very fast and it takes only several minutes to reach adsorption balance. After reaching adsorption balance, recoveries of total inorganic arsenic is up to 95 %. |
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