An Extractive Spectrophotometric Determination of Tin as Sn(II)-6-Chloro-3-hydroxy-7-methyl-2-(4'-methoxyphenyl)-4-oxo-4H-1-benzopyran Complex into Dichloromethane
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Department of Chemistry, Bhaskaracharya College of Applied Sciences, University of Delhi, Delhi-110075, India
Department of Chemistry, Kurukshetra University, Kurukshetra-136119, Haryana, India
Publish date: 2017-11-01
Eurasian J Anal Chem 2011;6(3):140–149
Tin(II) forms a yellow colored complex with 6-chloro-3-hydroxy-7-methyl-2-(4'-methoxyphenyl)-4-oxo-4H-1-benzopyran in hydrochloric acid medium. The complex is extractable into dichloromethane and shows maximum absorbance in the range 424-428 nm. The 1:2 (M: L) complex formed is found to be stable for more than 4 h in dichloromethane. Beer’s law is obeyed in the range 0.0 to 1.68 μg Sn(II) mL-1 with an optimum range of determination as found from Ringbom plot is 0.23-1.51 μg mL-1. The molar absorptivity and Sandell’s sensitivity of the complex are 6.29×104 L mol-1 cm-1 and 0.0019 μg Sn(II) cm-2 at 426 nm, respectively. The method is free from interference of a large number of important anions/complexing agents and cations. The method is quite simple and has been satisfactorily applied to the analysis of tin in various samples including gun metal and tin can.
Harish Kumar Sharma   
Department of Chemistry, Kurukshetra University, Kurukshetra-136119, Haryana, India
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