The effects of concentration, temperature, stirring rate and specific interfacial area on the extraction of Pd (Ⅱ) with bis(2--ethylhexyl) sulfide (DEHS) were studied by the use of a constant interracial area cell. T...The effects of concentration, temperature, stirring rate and specific interfacial area on the extraction of Pd (Ⅱ) with bis(2--ethylhexyl) sulfide (DEHS) were studied by the use of a constant interracial area cell. The results support an interracial chemical reaction regime.展开更多
In the present work, an easy solid phase extraction method using alumina modified with polyethylenimine as a new adsorbent was applied to the simultaneous extraction of copper, silver, and palladium ions prior to thei...In the present work, an easy solid phase extraction method using alumina modified with polyethylenimine as a new adsorbent was applied to the simultaneous extraction of copper, silver, and palladium ions prior to their determination with electrothermal atomic absorption spectrometry. The analytical procedure involved the complex formation of these cations with polyethylenimine as a chelating agent in buffer media of pH 7.0. Under the optimum conditions, a preconcentration factor of 200, 150, and 200, precision of ~5.4%, ＋4.7%, and ＋5.2% and linear calibration ranges of 15.0-140, 4.0-93, and 7.5-125 ng/L （in original solution） for Cu, Ag, and Pd were obtained, respectively. Also detection limits of 3.9,1.1, and 2.0 ng/L were obtained for Cu, Ag, and Pd, respectively. The proposed method was applied to the determination of copper, silver, and palladium in some real samples with satisfactory results.展开更多
文摘The effects of concentration, temperature, stirring rate and specific interfacial area on the extraction of Pd (Ⅱ) with bis(2--ethylhexyl) sulfide (DEHS) were studied by the use of a constant interracial area cell. The results support an interracial chemical reaction regime.
文摘In the present work, an easy solid phase extraction method using alumina modified with polyethylenimine as a new adsorbent was applied to the simultaneous extraction of copper, silver, and palladium ions prior to their determination with electrothermal atomic absorption spectrometry. The analytical procedure involved the complex formation of these cations with polyethylenimine as a chelating agent in buffer media of pH 7.0. Under the optimum conditions, a preconcentration factor of 200, 150, and 200, precision of ~5.4%, ＋4.7%, and ＋5.2% and linear calibration ranges of 15.0-140, 4.0-93, and 7.5-125 ng/L （in original solution） for Cu, Ag, and Pd were obtained, respectively. Also detection limits of 3.9,1.1, and 2.0 ng/L were obtained for Cu, Ag, and Pd, respectively. The proposed method was applied to the determination of copper, silver, and palladium in some real samples with satisfactory results.
