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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 3
JKCSEZ 54(3)
June 20, 2010 

Determination of Trace Amounts of Zirconium by Flotation - Spectrophotometric Method

부유 - 분광광도법에 의한 지르코늄의 극미량 측정
N Pourreza*, H Parham, S Shiri

N Pourreza*, H Parham, S Shiri
부유-분광광도법, 지르코늄, 자일렌 오렌지 , Flotation-Spectrophotometry, Zirconium, Xylenol orange

A sensitive and reproducible method for the flotation-spectrophotometric determination of zirconium is reported. The method is based on the complex formation zirconium and xylenol orange (XO) which is floated in the interface of aqueous phase and n-hexane by vigorous shaking. By discarding the aqueous solution and n-hexane, the adsorbed complex on to the wall of a separating funnel was dissolved in a small volume of methanol solvent and its absorbance was measured at 429 nm. The effect of different parameters such as pH, concentrations of HCl, and XO, and volume of n-hexane flotation dissolvent, standing and shaking time were studied. The calibration curve was linear in the range of 7-120 ng mL-1 of zirconium with a correlation coefficient of 0.9991. The limit of detection (LOD) was 5.8 ng mL-1. The relative standard deviation (RSD) for seven replicate measurements of 50 and 110 ng mL-1 of zirconium were 4.4 and 3.0%, respectively. The method was successfully applied to the determination of zirconium in water samples.

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