Determination of trace total inorganic arsenic by hydride generation atomic fluorescence spectrometry after solid phase extraction-preconcentration on aluminium hydroxide gel
Determination of trace total inorganic arsenic by hydride generation atomic fluorescence spectrometry after solid phase extraction-preconcentration on aluminium hydroxide gel
复制标题
氢氧化铝凝胶固相萃取-富集氢化物发生原子荧光光谱法测定痕量总无机砷
DOI：
10.1007/s00604-013-0941-7
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发表时间：
2013-04-01
影响因子：
5.7
通讯作者：
Yang, Lixia
中科院分区：
文献类型：
--
作者：
Deng, Fang;Dong, Ruizhi;Yang, Lixia
我们描述了一种简单、有效、廉价且快速的方法，通过使用氢氧化铝凝胶吸附剂和氢化物发生原子荧光光谱法 (HGAFS) 的改进固相预浓缩程序来测定水样中痕量总无机砷。该方法避免了耗时且消耗溶剂的传统萃取程序。研究了吸附剂用量、溶液pH值、吸附时间和潜在干扰离子的影响。最佳条件下，检出限为3ng•L−1，富集因子为167。校准图在0.05～10μg•L−1范围内呈线性，相关系数为0.9992。相对标准偏差 (RSD) 小于 6.1% (n= 5)，加标环境水中的回收率 >100%。该方法成功应用于天然水样中总无机砷的测定。图上图显示了吸附时间对总无机砷回收率的影响。总无机砷的吸附速度很快，仅需几分钟即可达到吸附平衡。达到吸附平衡后，总无机砷的回收率高达95%。
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.FigureThe 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 %.