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Advances in Chemistry
Volume 2014 (2014), Article ID 750973, 6 pages
Research Article

A Rapid Extractive Spectrophotometric Method for the Determination of Tin with 6-Chloro-3-hydroxy-2-(2′-thienyl)-4-oxo-4H-1-benzopyran

1Department of Chemistry and Centre of Advanced studies in Chemistry, Panjab University, Chandigarh 160014, India
2Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana 136119, India

Received 31 May 2014; Revised 3 July 2014; Accepted 31 July 2014; Published 14 August 2014

Academic Editor: Gerd-Uwe Flechsig

Copyright © 2014 Ramesh Kataria and Harish Kumar Sharma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An extractive spectrophotometric method for the determination of the trace amounts of tin has been carried out by employing 6-chloro-3-hydroxy-2-(2′-thienyl)-4-oxo-4H-1-benzopyran (in acetone) (CHTB) for the complexation of the metal ion in HCl medium. The colored species thus produced is quantitatively extracted into dichloromethane and shows the maximum absorbance at 432–437 nm. The method obeys Beer’s law in the range 0.0–1.3 μg mL−1 of tin with molar absorptivity and Sandell’s sensitivity of  L mol−1 cm−1 and 0.0020 μg Sn cm−2, respectively, at 435 nm. The method is highly selective and free from the interference of a large number of elements including platinum metals. The ratio of metal to ligand in the extracted species is 1 : 2. Utilizing this method, the analysis of various synthetic and technical samples including gun metal and tin can have been carried out satisfactorily.