FIBER OPTIC AIDED SPECTROPHOTOMETRIC DETERMINATION OF GADOLINIUM IN FBR REPROCESSING STREAMS
International Journal of Advances in Chemistry (IJAC), 3 (1/2):
01-10 (May 2017)DOI: 10.5121/ijac.2017.3201
Abstract
A new spectrophotometric method has been developed for the quantitative analysis of gadolinium using 1,
2-dihydroxy anthraquinone-3-sulphonic acid, sodium salt (Alizarin Red S). Influence of various parameters
such as concentration of complexing agent, pH, and interference of other competing metal ions was
examined in a systematic manner. Gadolinium is found to be a stable complex as Gd-ARS at pH 4.6-4.8
and having a maximum absorbance at 530 nm. Beer’s law was found to be obeyed in 1to14 µg/mL range of
gadolinium with a correlation coefficient of R2
= 0.9992 (n=14). The system allowed for the determination
of gadolinium with a limit of detection (LOD) (3.3σ/S) of 0.264 µg/mL, limit of quantitation (LOQ) (10σ/S)
of 0.8 µg/mL. The precision expressed as relative standard deviation (RSD) of 0.38 % and 1.96 % at 5.4
and 1.85 mg/L. Its molar absorptivity and Sandell’s sensitivity are found to be 9.33x103
L.Mol-1
.cm
-1 and
1.07x10-4 µg/cm2
respectively. An easy and versatile determination of gadolinium concentration during the
solvent extraction study of Gadolinium with 30% tri-n-butyl phosphate-nitric acid system is proposed.