Journal
MICROCHEMICAL JOURNAL
Volume 133, Issue -, Pages 441-447Publisher
ELSEVIER
DOI: 10.1016/j.microc.2017.03.056
Keywords
Metal organic frameworks; Arsenic; Slurry sampling; Hydride generation; Atomic fluorescence spectrometry
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Funding
- NNSFC (National Natural Science Foundation of China) [21529501]
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In this work, metal organic framework (MOF) UiO-66 with strong stability in water was synthesized and used for the preconcentration of ultratrace arsenic in environment water and the precipitated UiO-66 was converted to slurry for direct determination with hydride generation-atomic fluorescence spectrometry (HG-AFS). Factors affecting the adsorption of arsenic by UiO-66, including pH, adsorption time, stability of UiO-66, masking agents together with the optimum conditions of HG-AFS were investigated in detail. The performance of UiO-66 for adsorbing arsenic was excellent at room temperature over a wide range of pH from 1 to 11, and adsorption efficiencies of >95% could be achieved within only 5 min. Meanwhile, since conventional digestion process is avoided, the slurry sampling method is fast and convenient with greatly reduced matrix interference. Under the optimum conditions, it shows a good linear relationship between AFS intensities (I) and the concentrations of arsenic (C) (I = 547C + 61) with linear correlation coefficients better than 0.99. A precision of 3% (RSD%, n = 11) at 1 ng/mL and a limit of detection (LOD) of 0.0002 ng/mL were obtained. (C) 2017 Published by Elsevier B.V.
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