Authors: Mohammad Reza Rezaei Kahkha Saba Daliran Ali Reza Oveisi Massoud Kaykhaii Zahra Sepehri
Publish Date: 2017/01/07
Volume: 10, Issue: 7, Pages: 2175-2184
Abstract
In this study the highly stable mesoporous porphyrinic zirconium metalorganic framework namely PCN222/MOF545 ZrMOF was prepared and used for pipettetip solidphase extraction of HgII As a highcapacity sorbent 4 mg of the ZrMOF was placed into a conventional pipette tip and used for the first time for the fast extraction and preconcentration of mercury ions For desorption 50 μL of 10 HCl was used by 15 repeated aspirating/dispensing cycles and Hg ions in elusion were measured by a cold vapor atomic absorption spectrometer Affecting parameters on extraction efficiency were studied and optimum conditions were established as amount of sorbent 2 mg pH was adjusted to 50 the eluting volume was 15 μL and extraction was performed on 18 mL of the sample The optimal number of aspirating/dispensing cycles for extraction and desorption of analytes was found to be 10 and 15 cycles respectively The limit of detection of the method was found to be 20 ng L−1 with a relative standard deviation of ≤31 for seven replicate analyses of 20 μg L−1 of mercury Adsorption capacity and enrichment factor were 355 mg g−1 and 120fold respectively The proposed method was successfully applied for the determination of HgII ions in fish samplesMohammad Reza Rezaei Kahkha declares that he has no conflict of interest Saba Daliran declares that she has no conflict of interest Ali Reza Oveisi declares that he has no conflict of interest Massoud Kaykhaii declares that he has no conflict of interest Zahra Sepehri declares that she has no conflict of interest
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