A novel indicator reaction for the catalytic determination of V(V) at ppb levels by the kinetic spectrophotometric method
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Keywords

catalytic effect
V(V)
kinetic-spectrophotometric method
fixed-time method
bromate
Ponceau Xylydine and 5-sulphosalycilic acid

How to Cite

Ulusoy, H. İbrahim, & Gürkan, R. (2009). A novel indicator reaction for the catalytic determination of V(V) at ppb levels by the kinetic spectrophotometric method. Eclética Química, 34(4), 49–64. https://doi.org/10.26850/1678-4618eqj.v39.4.2009.p49-64

Abstract

A novel sensitive and relatively selective kinetic method is presented for the determination of V(V), based on its catalytic effect on the oxidation reaction of Ponceau Xylydine by potassium bromate in presence of 5-sulfosalicylic acid (SSA) as activator. The reaction was monitored spectrophotometrically by measuring the decrease in absorbance of Ponceau Xylydine at 640 nm between 0.5 to 7 min (the fixed time method) in H3PO4 medium at 25oC. The effect of various parameters such as concentrations of H3PO4, SSA, bromate and Ponceau Xylydine, temperature and ionic strength on the rate of net reaction were studied. The method is free from most interferences, especially from large amounts of V(IV). The decrease in absorbance is proportional to the concentration of V(V) over the entire concentration range tested (1–15 ng mL−1) with a detection limit of 0.46 ng mL–1 (according to statistical 3Sblank/k criterion) and a coefficient of variation (CV) of 1.8% (for ten replicate measurement at 95% confidence level).

https://doi.org/10.26850/1678-4618eqj.v39.4.2009.p49-64
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