期刊
ANALYTICA CHIMICA ACTA
卷 725, 期 -, 页码 81-86出版社
ELSEVIER
DOI: 10.1016/j.aca.2012.03.005
关键词
Modified mesoporous silica; Hexavalent chromium; Trivalent chromium; Solid phase extraction; Flame atomic absorption spectrometry
资金
- National Natural Science Foundation of China [21175145]
- Science and Technology Commission of Shanghai Municipality [09142201800]
- Chinese Academy of Sciences [O87YQ1110G]
A modified SBA-15 mesoporous silica material NH2-SBA-15 was synthesized successfully by grafting gamma-aminopropyl-triethoxysilane. The material was characterized using transmission electron microscopy (TEM) and Fourier transform infrared/Raman (FT-IR/Raman) spectroscopy. and used for the first time in a flow injection on-line solid phase extraction (SPE) coupled with flame atomic absorption spectrometry (FAAS) to detect trace Cr (VI). Effective sorption of Cr (VI) was achieved at pH 2.0 with no interference from Cr (III) and other ions and 0.5 mol L-1 NH3 center dot H2O solution was found optimal for the complete elution of Cr (VI). An enrichment factor of 44 and was achieved under optimized experimental conditions at a sample loading of 2.0 mL min(-1) sample loading (300 s) and an elution flow rate of 2.0 mL min(-1) (24 s). The precision of the 11 replicate Cr (VI) measurements was 2.1% at the 100 mu g L-1 level with a detection limit of 0.2 mu g L-1 (3 s, n = 10) using the FAAS. The developed method was successfully applied to trace chromium determination in waste water. The accuracy was validated using a certified reference material of riverine water (GBW08607). (c) 2012 Elsevier B.V. All rights reserved.
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