Separation and determination of Cd in biological materials by continuous-flow fluid extraction coupled to flow-injection ICP-AES |
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| Authors: | E Vereda Alonso M T Siles Cordero A García de Torres and J M Cano Pavón |
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| Institution: | (1) Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, E-29 071 Málaga, Spain |
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| Abstract: | An FI-ICP-AES method for the determination of trace levels of cadmium in biological samples is described based on the complexation of the metal ion with 1,5-bis(di-2-pyridyl)methylene thiocarbohydrazide (DPTH) and its subsequent on-line extraction into isobutyl methyl ketone (IBMK). The detection limit for cadmium is 8.7 ng/ml and the calibration is linear at least from 10 to 2000 ng/ml. The relative standard deviation for 7 replicate measurements is 3.4% for 100 ng/ml of cadmium. Results from the analysis of some certified biological reference materials are given. |
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