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Pandey G.P.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | Singh A.K.,Government Vyt Postgraduate Autonomous College | Deshmukh L.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | Prasad S.,University of The South Pacific | And 3 more authors.
Microchemical Journal | Year: 2014

A novel and sensitive kinetic spectrophotometric method for the determination of malathion has been developed. The method is based on the oxidation of malathion with slight excess of N-bromosuccinimide (NBS) at 30°C where unconsumed NBS was monitored with safranine dye spectrophotometerically at λmax 530nm using fixed time procedure after 10min of the reaction. The oxidized product was characterized as malaoxon by Fourier transformation infrared (FTIR) spectroscopy. Beer's law was obeyed in the concentration range of 0.025-0.25μgmL-1. Important analytical parameters such as time, temperature, reagents concentration, and acidity have been optimized for the reaction. Sandell's sensitivity and molar absorptivity for the reaction system were found to be 0.0003μgcm-2 and 9.6×105Lmol-1cm-1 respectively. The proposed method was successfully applied for the determination of malathion in different samples with satisfactory results. The results were compared with those obtained by GC-MS methods. © 2013 Elsevier B.V.


Pandey G.P.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | Singh A.K.,Government Vyt Postgraduate Autonomous College | Prasad S.,University of The South Pacific | Deshmukh L.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | And 3 more authors.
Microchemical Journal | Year: 2016

A novel, simple, sensitive and selective kinetic spectrophotometric method has been developed for the determination of Hg(II) in environmental samples. The method is based on the catalytic effect of Hg(II) on the potassium bromate-leucocrystal violet (LCV) reaction system in the acidic medium. Decolourization of LCV was used to monitor the reaction spectrophotometrically at 595 nm. The indicator reaction obeys Beer's law in the range of 0.005-0.05 μg mL-1. The effects of various parameters such as pH, time, temperature and the concentration of the reagents have been optimized for the indicator reaction. Sandell's sensitivity and molar absorptivity for the system were found to be 0.00006875 μg cm-2 and 3.95 × 106 L mol-1 cm-1, respectively. The detection limit and the limit of quantification were calculated to be 0.0021 μg mL-1 and 0.014 μg mL-1, respectively. The proposed method involving KBrO3 for the oxidation of LCV has successfully been applied for the determination of Hg(II) in vegetables, water, soil and fungicides samples. © 2016 Elsevier B.V.


Pandey G.P.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | Singh A.K.,Government Vyt Postgraduate Autonomous College | Prasad S.,University of The South Pacific | Deshmukh L.,Dr Ira Nimdeokar Postgraduate And Research Center For Chemistry | Asthana A.,Government Vyt Postgraduate Autonomous College
Microchemical Journal | Year: 2014

A simple and highly selective surfactant assisted kinetic spectrophotometric method for the determination of thallium has been developed. The method is based on the quantitative oxidation of Tl(I) to Tl(III) using bromine water where the resulting Tl(III) liberated iodine from potassium iodide in acidic medium. The liberated iodine was subsequently reacted with I- ion to form tri-iodide ions (I3 -). The tri-iodide ions formed were further reacted with cetylpyridinium cation (CP+) which produced a violet ion associate species having a λmax of 512nm at which reaction was monitored. The reaction variables such as time, temperature, reagent concentration and acidity were optimized for the indicator reaction to achieve maximum sensitivity. The linear regression calibration concentration range of 0.007-0.1μgmL-1 Tl(I) was established as the Beer's law was obeyed in this range. Sandell's sensitivity and molar absorptivity of the ion associate species in terms of thallium were determined to be 0.000133μgcm-2 and 1.99×106Lmol-1cm-1 respectively. The limit of detection was determined as 0.0029μgmL-1. The developed method has successfully been applied for the determination of thallium in different environmental samples with satisfactory results. © 2014 Elsevier B.V.

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