Determination of nickel and cadmium in fish, canned tuna, black tea, and human urine samples after extraction by a novel quinoline thioacetamide functionalized magnetite /graphene oxide nanocomposite
관리자2018-05-03조회 2217
In this research, a novel and efficient quinoline thioacetamide functionalized magnetic graphene
oxide composite (GO@Fe3O4@QTA) was synthesized and utilized for dispersive
magnetic solid phase preconcentration of Cd(II) and Ni(II) ions in urine and various
food samples. A number of diverse methods were employed for characterization of the
new nanosorbent. The design of experiments approach and response surface methodology
were applied to monitor and find the parameters that affect the extraction performance. After
sorption and elution steps, the concentrations of target analytes were measured by employing
FAAS. The highest extraction performance was achieved under the following experimental
conditions: pH, 5.8; sorption time, 6.0 min; GO@Fe3O4@QTA amount, 17 mg; 2.4 mL 1.1
mol L-l HNO3 solution as the eluent and elution time, 13.0 min. The detection limit is 0.02
and 0.2 ng mL-1 for Cd(II), and Ni(II) ions, respectively. The accuracy of the new
method was investigated by analyzing two certified reference materials (sea food mix, Seronorm
LOT NO 2525 urine powder). The interfering study revealed that there are no interferences
from commonly occurring ions on the extractability of target ions. Finally, the new
method was satisfactorily employed for rapid extraction and determination of target ions in
urine and various food samples.
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