期刊
TALANTA
卷 85, 期 1, 页码 625-630出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.04.039
关键词
Silica bound dithizone; Flow injection; Solid-phase extraction; Copper; Flame atomic absorption spectrometry
资金
- Natural Science Foundation of China [21005011, 21075013, 20725517, 20821120292]
- SRFDP program [20100042120027]
- Fundamental Research Funds for the Central Universities [N90105001, N100305003]
A novel adsorbent-silica gel bound dithizone (H(2)Dz-SG) was prepared and used as solid-phase extraction of copper from complex matrix. The H(2)Dz-SG is investigated by means of FT-IR spectra and the SEM images, demonstrating the bonding of dithizone. The H(2)Dz-SG quantitatively adsorb copper ions, and the retained copper is afterwards collected by elution of 10% (v/v) nitric acid. An on-line flow injection solid-phase extraction procedure was developed for trace copper separation and preconcentration with detection by flame atomic spectrometry. By loading 5.4 mL of sample solution, a liner range of 0.5-120 mu g L-1, an enrichment factor of 42.6, a detection limit of 0.2 mu g L-1 and a precision of 1.7% RSD at the 40 mu g L-1 level (n = 11) were obtained, along with a sampling frequency of 47 h(-1). The dynamic sorption capacity of H(2)Dz-SG to Cu2+ was 0.76 mg g(-1). The accuracy of the proposed procedure was evaluated by determination of copper in reference water sample. The potential applications of the procedure for extraction of trace copper were successfully accomplished in water samples (tap, rain, snow, sea and river). The spiking recoveries within 91-107% are achieved. (C) 2011 Elsevier B.V. All rights reserved.
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