Minimization of mass interferences in quadrupole inductively coupled plasma mass spectrometric (ICP-MS) determination of palladium using a flow injection on-line displacement solid-phase extraction protocol |
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| Institution: | 1. School of Materials and Metallurgy, Northeastern University, Box 117, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang City 110819, China;2. School of Science, Northeastern University, Box 332, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang City, 110819, China;1. Chongqing Key Laboratory of Environmental Materials and Remediation Technology, College of Materials and Chemical Engineering, Chongqing University of Arts and Sciences, Chongqing 402160, PR China;2. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 N. Zhongshan Road, Shanghai 200062, PR China;3. Yongchuan Institute for Food and Drug Control, Chongqing 402160, PR China;4. Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing 402160, PR China;1. Jo?ef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia;2. University of Ljubljana, Faculty of Chemistry and Chemical Technology, A?ker?eva 5, SI-1000 Ljubljana, Slovenia;1. Department of Biosciences, Integral University, Lucknow, 226026, UP, India;2. Department of Bioengineering, Integral University, Lucknow, 226026, UP, India;3. Department of Biology, University of Ottawa, 30 Marie-Curie, Ottawa, ON, K1N 6N5, Canada;4. Center for Stroke Recovery, Ottawa Hospital Research Institute and Department of Medicine, University of Ottawa, Ottawa, Ontario, Canada;5. Medipure Pharmaceuticals Inc., Maple Ridge, BC, V2X 2Z3, Canada;1. Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC 27710, USA;2. Department of Psychiatry & Behavioral Sciences, Duke University Medical Center, Durham, NC 27710, USA |
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| Abstract: | A flow injection on-line displacement solid-phase extraction protocol was employed to minimize mass interferences with determination of palladium by inductively coupled plasma mass spectrometry (ICP-MS). The developed method involved in on-line complexing of Ag+ with pyrrolidine dithiocarbamate (PDC), presorption of the resultant Ag–PDC onto a microcolumn packed with the cigarette filter, displacement sorption of Pd2+ through loading the sample solution onto the microcolumn due to on-line displacement reaction between Pd2+ and the presorbed Ag–PDC, elution of the retained Pd2+ with 50 μL of ethanol for on-line ICP-MS detection. Interferences from co-existing heavy metal ions with lower stability of their PDC complexes relative to Ag–PDC were minimized/eliminated. No interferences from 5 mg L? 1 Zn and 3 mg L? 1 Pb for 104Pd, 0.4 mg L? 1 Cu for 105Pd, 6 mg L? 1 Zn and 2 mg L? 1 Cd for 106Pd, 6 mg L? 1 Zn and 3 mg L? 1 Cd for 108Pd, and 2 mg L? 1 Cd for 110Pd were observed for the determination of 100 ng L? 1 Pd. The enhancement factors of 71–75, sample throughput of 23 samples h? 1 and detection limits of 2.8–3.5 ng L? 1 were achieved with the consumption of 3.0 mL of sample solution. The precision (RSD) for eleven replicate determinations of Pd at the 100 ng L? 1 level was 1.8–2.7%. The developed method was applied to the determination of palladium in rock samples. |
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