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• W1989801802 abstract "A simple and powerful microextraction technique was used for determination of cadmium in water samples using liquid phase microextraction (LPME) followed by graphite furnace atomic absorption spectrometry (GF-AAS). In a preconcentration step, cadmium was extracted from a 2 mL of its aqueous sample in the pH = 6 as cadmium-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) cationic complex into a 4 µL drop of nitrobenzene and ammonium tetraphenylborate as counter ion. In the drop, the cadmium-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) ammonium tetraphenylborate ion associated complex was formed. After extraction, the microdrop was retracted and directly transferred into a graphite tube modified by [Pd(c) + Pd(i)]. Some effective parameters on extraction and complex formation, such as type and volume of organic solvent, pH, concentration of chelating agent and counter ion, extraction time and stirring rate were optimized. Under the optimum conditions, the enrichment factor and recovery were 390 and 78%, respectively. The calibration graph was linear in the range of 0.01–1 µg L− 1 with correlation coefficient of 0.9952 under the optimum conditions of the recommended procedure. The detection limit based on the 3Sb criterion was 0.0065 µg L− 1 and relative standard deviation (RSD) for eight replicate measurements of 0.1 µg L− 1 and 0.4 µg L− 1 cadmium was 6.4 and 5.8% respectively. The characteristic concentration was 0.0014 µg L− 1 equivalent to a characteristic mass of 5.6 fg. In order to evaluate the accuracy and recovery of the presented method the procedure was applied to the analysis of reference materials and seawater." @default.
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• W1989801802 date "2008-12-01" @default.
• W1989801802 modified "2023-10-16" @default.
• W1989801802 title "Determination of trace amounts of cadmium by modified graphite furnace atomic absorption spectrometry after liquid phase microextraction" @default.
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• W1989801802 doi "https://doi.org/10.1016/j.microc.2008.04.002" @default.
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