Ligandless preconcentration and determination of cadmium in food and human serum samples by dispersive liquid- liquid microextraction method based on a task-specific ionic liquid combined with flame atomic absorption spectrometry
Subject Areas : Others
Neda Sarrafi
1
(
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
)
Susan Sadeghi
2
(
Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
)
Keywords: Task specific ionic liquid, Flame atomic absorption spectrometry, Dispersive liquid-liquid microextraction, Cadmium ions,
Abstract :
In the present paper, a simple, and reliable method for the preconcentration of cadmium ions based on dispersive liquid-liquid microextraction technique is introduced. A new task specific ionic liquid (TSIL) was used as an extractant for the selective preconceration of Cd2+ ions from aqueous solution and determination by flame atomic absorption spectrometer (AAS). Parameters affecting the extraction of Cd2+ ions such as pH solution, TSIL concentration, centrifugation time, hydrophobic salt concentration, nonionic surfactant concentration, and ionic strength were optimized. Under the optimal conditions, the calibration curve was linear in the concentration range of 5 - 250 µg L-1 with a detection limit of 0.42 µg L-1 Cd2+. Since, TSIL has a high affinity toward cadmium ions, interferents have little effects on the microextraction, so satisfactory recoveries were obtained for the extraction of trace amounts of cadmium ions from real samples (blood serum, milk and honey).
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