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|Title:||Kinetic determination of mercury(II) at trace level from its catalytic effect on ligand substitution reaction between hexacyanoferrate(II) and nitroso-R-salt|
|Authors:||Naik, R M|
ligand substitution reaction
|Abstract:||A kinetic method is described for the determination of mercury(II), based on its catalytic effect on the ligand substitution reaction between hexacynoferrate(II) and Nitroso-R-Salt. The reaction is followed spectrophotometrically by measuring the absorbance at fixed times at 720 nm, the λ<sub>max</sub> of green coloured complex, [Fe(CN)<sub>5</sub>NRS]<sup>3–</sup> formed during the course of reaction under optimum reaction conditions <i style="">viz</i>, temp = 25.0±0.1 °C, pH = 6.5±0.02 and <i style="">I</i> = 0.1 M(KNO<sub>3</sub>). The method is simple, sensitive, selective, rapid and allows the determination of as little as 10<sup>–6</sup> M of mercury with good accuracy and precision. The detection limit is computed by standard procedure and found to be 1.6 <img src='/image/spc_char/cross.gif' border=0> 10<sup>–7 </sup>M of [Hg<sup>2+</sup>]. The effects of few interfering and non-interfering cations and anions on mercury(II) determination have also been reported with relative standard deviations.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.12(5) [September 2005]|
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