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Parmar P.,Government Vyt Autonomous College | Pillai A.K.,Government Vyt Autonomous College | Gupta V.K.,Government Vyt Autonomous College | Gupta V.K.,Pandit Ravishankar Shukla University
Journal of the Korean Chemical Society | Year: 2010

A rapid spectrophotometric employed for the determination of trace amounts of cyanide and hydrogen cyanide using p-aminoacetanilide in samples was reported. An aqueous solution containing 0.4 ~ 5.0 μg of cyanide was taken and 1 mL of pyridine-p-aminoacetanilide reagent was added to it followed 1 mL of chloramine-T at 30°C. Contaminated air was drawn into two midget impingers, each containing 10 mL of 0.1 M NaOH solution connected to a source of suction in the environment at a flow rate of 0.25 L min-1 for 15 min. The stock solution of fenvalerate pesticide of 1 mg mL-1 was prepared in ethanol and working standards were prepared by appropriate dilution of the stock. 1.0 mL of 2 M sodium hydroxide solution was added to known amount of pesticide and after 5 minutes, 1 mL of 2 M hydrochloric acid, 1 mL of pyridine-p-aminoacetanilide reagent and 1 mL of chloramine-T were added. The results show that final colored product was stable for 30 min and showed maximum absorbance at 485 nm where as the reagent blank had negligible absorbance at this wave length. Source


Tiwari A.,Government Vyt Autonomous College | Devangan T.,Government Vyt Autonomous College | Bajpai A.K.,Government Model Science College
Toxicological and Environmental Chemistry | Year: 2010

Static and dynamic adsorption studies of Co (II) ions have been undertaken at fixed pH and ionic strength taking binary biopolymeric beads of cross-linked calcium alginate and carboxy methylcellulose as biosorbents. The adsorption data were applied to Langmuir and Freundlich isotherm equations and various static parameters were calculated. The dynamic nature of adsorption process was quantified in terms of several kinetic constants such as rate constants for adsorption (K) and Lagergreen rate constant (Kad). The influence of various experimental parameters such as solid-to-liquid ratio, pH, and temperature, the presence of salts and chemical composition of biopolymeric beads were investigated on the adsorption of cobalt ions. © 2010 Taylor & Francis. Source

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