光谱学与光谱分析 |
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Determination of Trace Mercury in Wastewater by a Flow Injection Analysis Composed of Immobilized Ionic Liquid Enrichment and Colorimetric Detection |
ZHANG Jun, MAO Li-li, YANG Gui-peng*, GAO Xian-chi, TANG Xu-li |
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China |
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Abstract Amberlite XAD-7 resin was modified by room temprature ionic liquid (1-hexyl-3-methylimidazolium hexafluorophosphate,[C6mim]PF6) coating through a maceration method, gaining a new sort of hydrophobic adsorbent for the solid phase extraction mini-column. Trace inorganic mercury in wastewater samples was preconcentrated and determined by flow injection on-line mini-column sampling coupled with spectrophotometric determination. In acid medium, dithizone was employed as chelator with cetyltrimethylammonium bromide (CTMAB) to form a red neutral mercury-dithizone complex, which could be extracted quantificationally by solid phase extraction technique on the mini-column.Under the optimized conditions, the linearity and the detection limit of the proposed method were found to be 0.35 to 50.0 μg·L-1 Hg2+ and 0.067 μg·L-1 Hg2+, respectively. The enrichment factor of 25 times could be achieved with a 50 mL sampling volume and the developed procedure was successfully applied for the determination of mercury in the certified reference material (GSBZ50016-90) and the spiked dock wastewater samples with the recovery of 99%-103%.
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Received: 2009-08-02
Accepted: 2009-11-06
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Corresponding Authors:
YANG Gui-peng
E-mail: gpyang@ouc.edu.cn
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