Trace Determination of Zirconium (IV) as its 3-Hydroxy-2-[2′-(5′-Methylthienyl)]-4H-Chromen-4-One Complex and Structural Elucidation by Quantization Technique

Abstract

Micro determination of Zirconium (IV) has been carried out using 3-Hydroxy-2-[2′-(5′-methylthienyl)]-4H-chromen-4-one (HMTC) as an analytical reagent. Zr (IV) forms a 1:4 (M:L) yellow coloured complex with HMTC extracted into dichloromethane from ammoniacal medium (pH 7.05–7.09). The complex system shows a maximum at 424–440 nm and follows Beer’s law in the range 0.0–0.9 µg Zr (IV) ml⁻¹ with an optimum range of determination as 0.27–0.79 µg Zr (IV) ml⁻¹as detected from Ringbom plot. Zr (IV)-HMTC complex has molar absorptivity of 8.22 × 10⁴ Lmol⁻¹ cm⁻¹, specific absorptivity of 0.900 ml g⁻¹ cm⁻¹ and Sandell’s sensitivity value 0.0011 µg Zr (IV)cm⁻²; the linear regression equation being Y = 0.981X − 0.036 (Y = absorbance, X = µg Zr (IV) ml⁻¹) with the correlation coefficient 0.9987. Detection limit of the procedure is 0.0174 µg ml⁻¹. The repercussions obtained are highly consistent with the standard deviation of ±0.0039 absorbance unit and has been confirmed by student’s t-test with 0.5% limit. The proposed technique has been successfully applied in diverse synthetic and industrial samples.