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Optimization and Validation of the Spectrophotometric Method for Quantification of Europium in Aqueous Reprocessing Streams |
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PP: 227- 233 |
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doi:10.18576/jrna/050310
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Author(s) |
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S. Ganesh,
N.K. Pandey,
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Abstract |
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| Europium(III) ion reacts with 3, 6-bis[(2-Arsonophenyl)azo]-4,5dihydroxy-2,7-naphtalene di sulphonic acid (Arsenazo III) to form a raspberry-red colour complex. The complex formed instantaneously at pH 2.6-2.8, maintained by mono chloroacetic acid and sodium acetate buffer and stable for over 24 hrs. The 1:1 chelate complex exhibits maximum absorption at 654 nm, obeys Beer’s law in the concentration range from 0.24 to 2.21 µg of Eu(III) per mL, has a molar absorptivity of 6.21x104 L.Mol-1.cm-1 and a Sandell’s sensitivity of 1.61x10-5 µg/cm2. From ten repeated determinations correlation coefficient was found to be ±0.98%. The limit of detection (LOD) (3.3σ/S) and limit of quantitation (LOQ) (10σ/S) were found to be 0.082 µg/mL and 0.249 µg/mL respectively. Interference of other competing metal ions, pH, and the concentration of the complexing agent, the stability of the colour and volume of the buffer were examined systematically. The proposed method is directly applicable for the determination of europium in environmental, industrial, water and waste streams of the nuclear plant. |
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