| Preconcentration and determination of lead by solidification of floated organic drop coupled with Nanodrop spectrophotometry |
| Paper ID : 2173-UFGNSM13-FULL (R1) |
| Authors: |
|
nafiseh khatibi *1, ali mazloomifar2 1No 6, 2-8 unite, fifth Parvaresh Alley , Postal code: 3471765885, preceptors block, minoodar town, Qazvin, Iran 2Department of Chemistry
Shahre-Rey Branch
Islamic Azad University |
| Abstract: |
| The liquid-phase microextraction based on solidification of floating organic microdrop coupled with UV-visible spectrophotometer for preconcentration and determination of lead in the aqueous samples has been developed. In this technique, 20µL of 1-undecanol containing dithizone as the chelating agent (10-3 mol L-1) was transferred to the water samples containing lead ions, and the solution was stirred for 25 min. The sample vial was cooled in an ice bath for 5 min. The solidified extract was transferred into a conical vial where it melted immediately, and then the organic phase was analyzed by Nanodrop spectrophotometer. Factors that influence the extraction and complex formation, such as pH, concentration of dithizone, extraction time, effect of ionic strenght, temperature and stirring rate were optimized. Under the optimized conditions, a preconcentration factor of 356, detection limit of 0.006 µgL-1, limit of quantification 0.018 µgL-1 and a good relative standard deviation of 2.1% were obtained. The procedure was applied to sea water, mineral water and well water. |
| Keywords: |
| Solidified floating organic drop, Lead, Dithizone, Nanodrop spectrophotometry |
| Status : Paper Accepted (Poster Presentation) |
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