Copyright (c) 2010 AJC
![Creative Commons License](http://i.creativecommons.org/l/by/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution 4.0 International License.
Flotation-Spectrophotometric Determination of Traces of Lead Ion
Asian Journal of Chemistry,
Vol. 22 No. 1 (2010): Vol 22 Issue 1, 2010
Abstract
A simple, fast, reproducible and sensitive method for the flotation- spectrophotometric determination of Pb2+ is reported. The method is based on the ternary ion-association of Pb2+, xylenol orange (XO) and cetyltrimethylammonium bromide (CTAB) which is floated at interface of aqueous phase and n-hexane by shaking the separating funnel. By discarding the aqueous solution (the more dense phase) the adsorbed ion associate (Pb2+-XO)-CTA+ on to the wall of a separatory funnel was extracted and dissolved in a small volume of methanol solvent and absorbance was measured at 583 nm. The apparent molar absorptivity (ε) of the ion associate was determined to be 6.13 × 104 mol-1 cm-1. The calibration curve was linear in the concentration range of 0.2-5.0 μg mL-1 of Pb2+ with a correlation coefficient of 0.9996. The limit of detection (LOD) is 0.0427 μg mL-1. The relative standard deviation (RSD) at 0.6 and 1.5 μg mL-1 of lead were 2.478 and 1.040 % (n = 8), respectively. The method was applied for measuring the amount of lead in blood and soil samples.
Keywords
Flotation-spectrophotometry
Lead
Xylenol orange
Cetyltrimethylammonium bromide
Ion associate.
NEKOUEI, F., & PARHAM*, H. (2009). Flotation-Spectrophotometric Determination of Traces of Lead Ion. Asian Journal of Chemistry, 22(1), 319–324. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/16650
Download Citation
Endnote/Zotero/Mendeley (RIS)BibTeX