کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4909493 | 1362624 | 2016 | 8 صفحه PDF | دانلود رایگان |
A new sensitive and simple method was developed for the preconcentration of trace amounts of cobalt (Co) using 1-(2-pyridylazo)-2-naphthol (PAN) as chelating reagent prior to its determination by flame atomic absorption spectrometry. The proposed method is based on the utilization of a column packed with graphene as sorbent. Several effective parameters on the extraction and complex formation were selected and optimized. Under optimum conditions, the calibration graph was linear in the concentration range of 5.0-240.0 μg Lâ1 with a detection limit of 0.36 μg Lâ1. The relative standard deviation for ten replicate measurements of 20.0 and 100.0 μg Lâ1 of Co were 3.45 and 3.18%, respectively. Comparative studies showed that graphene is superior to other adsorbents including C18 silica, graphitic carbon, and single- and multi-walled carbon nanotubes for the extraction of Co. The proposed method was successfully applied in the analysis of four real environmental water samples. Good spiked recoveries over the range of 95.8-102.6% were obtained.
Journal: Journal of Saudi Chemical Society - Volume 20, Supplement 1, September 2016, Pages S145-S152