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Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   FEBRUARY 2014 , Volume 11 , Number 1; Page(s) 1 To 8.
 
Paper: 

FLOW INJECTION ON-LINE SPECTROPHOTOMETRIC DETERMINATION OF THORIUM (IV) AFTER PRECONCENTRATION ON XAD-4 RESIN IMPREGNATED WITH OXYTETRACYCLINE

 
 
Author(s):  SHAHIDA SHABNAM*, ALI AKBAR, HALEEM KHAN MUHAMMAD
 
* DEPARTMENT OF CHEMISTRY, UNIVERSITY OF AZAD JAMMU AND KASHMIR, MUZAFFARABAD, AJK, PAKISTAN
 
Abstract: 

A very sensitive, selective and simple flow injection time-based method was developed for on-line preconcentration and determination of thorium IV) at micro g L-1 levels in environmental samples. The system operation was based on thorium (IV) ion retention at pH 4.0 in the minicolumn at a flow rate of 15.2 mL min-1. The trapped complex was then eluted with 3.6 mol L-1 HCl at a flow rate of 4.9 mL min-1. The amount of thorium (IV) in the eluate was measured spectrophotometrically at 651 nm using arsenazo-III solution (0.05 % in 3.6 mol L-1 HCl stabilized with 1 % triton X-100, 4.9 mL min-1) as colorimetric reagent. All chemical, and flow injection variables were optimized for the quantitative preconcentration of metal and a study of interference level of various ions was also carried out. The system offered low backpressure and improved sensitivity and selectivity. At a preconcentration time of 60 s and a sample frequency of 40 h-1, the enhancement factor was 97, the detection limit was 0.25 mg L-1, and the precision expressed as relative standard deviation was 1.08 % (at 50 mg L-1), whereas for 300 s of the preconcentration time and a sample frequency of 10 h-1, the enhancement factor of 357, the detection limit (3s) of 0.069 mg L-1 and the precision of 1.32 % (at 10 mg L-1) was reported. The accuracy of the developed method was sufficient and evaluated by the analysis of certified reference material IAEA-SL-1 (Lake Sediment) and spiked water samples.

 
Keyword(s): SPECTROPHOTOMETER, ON-LINE PRECONCENTRATION, IMPREGNATED XAD-4 RESIN, OXYTETRACYCLINE, THORIUM (IV)
 
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