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.
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.
PubMed | Government Vyt Autonomous College
Type: Journal Article | Journal: Environmental monitoring and assessment | Year: 2010
The present study is focused on the relationship of school community personal exposure of respirable particulate matter (RPM) with its indoor and ambient outdoor component. A representative longitudinal study design has been adopted. School community is divided into two categories: (1) subjects of science discipline and (2) subjects of nonscience discipline. On the basis of local meteorological parameters and school building constructions, three schools have been identified for the study. Selected subjects have been monitored for 24-h personal RPM exposure along with school indoor and respective outdoor RPM. Paired samples of ambient PM(10) and RPM were collected to establish the correlation between them. Regressions between school indoor and ambient outdoor RPM have shown strong positive relationships in case of two schools having moderate ventilation. The highest RPM to PM(10) ratio (0.62) has occurred at school X located near the steel plant downwind. Almost all indoor and ambient outdoor RPM levels exceed Indian National Ambient Air Quality Standards (NAAQS; 60 microg m( - 3)). Highest levels of indoor and ambient outdoor RPM have occurred in school X located near the steel plant. Subjects belonging to the school located near the steel plant (school X) have shown five to six times higher values of RPM compared to NAAQS standards.