کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1170581 | 960685 | 2007 | 5 صفحه PDF | دانلود رایگان |

A new method has been developed for the determination of gold based on separation and preconcentration with a microcolumn packed with nanometer TiO2 immobilized on silica gel (immobilized nanometer TiO2) prior to its determination by flame atomic absorption spectrometry. The optimum experimental parameters for preconcentration of gold, such as pH of the sample, sample flow rate and volume, eluent and interfering ions, have been investigated. Gold could be quantitatively retained by immobilized nanometer TiO2 in the pH range of 8–10, then eluted completely with 0.1 mol L−1 HNO3. The detection limit of this method for Au was 0.21 ng mL−1 with an enrichment factor of 50, and the relative standard deviation (R.S.D.) was 1.8% at the 100 ng mL−1 Au level. The method has been applied for the determination of trace amounts of Au in geological and water samples with satisfactory results.
Journal: Analytica Chimica Acta - Volume 604, Issue 2, 5 December 2007, Pages 114–118