Showing 2 results for Nazmara
A Meshkinian , H Asilian , Sh Nazmara , Jd Shahtaheri ,
Volume 1, Issue 3 (7 2003)
Abstract
The purpose of this study was to measure ambient lead concentrations in Tehran's 12th Municipal District and also Pb concentrations in urine samples from municipal workers assigned to the same region. In this research workers from the 12th District were matched and compared with a control group who were doing the same type of work in another region in northern Tehran with lighter traffic and comparatively clean air.Air samples were analyzed by atomic absorption techniques. Results showed the mean air concentration of lead to be higher than standard (1.5ug/m3) except on Fridays and Thursdays (1.9±0.32). The end-shift urine samples were prepared and analyzed using the HSE method. Lead levels in 77.1% of the urine samples were higher than HSE-recommended limits (643.86±353.73). The independent t-testindicated that the mean urine Pb concentration in the case group was significantly higher than in controls (p<0.001). Mean urine lead levels in smokers were significantly higher than non-smokers in case group (p^0.043). The Pearson Correlation test showed a significant relationship between urine Pb concentration and age, duration of employment, and smoking habit in case workers (r=0.427, p= 0.011, r=0.385, p=0.632 and r=0.632, p=0.009 respectively). Also, the Kruskal-Wallis test indicated that urine lead levels were independent of the workers'education level and work shifts.
A Mesdaghinia, H Nourmoradi, F Vaezi, S Naseri, R Nabizadeh, M Ali Mohammadi, Sh Nazmara,
Volume 6, Issue 2 (27 2008)
Abstract
Background and Aim: Methyl tertiary butyl ether (MTBE) is an oxygenated additive chemical added to gasoline, which is as a substitute for tetra ethyl lead, to reduce discharge of pollutants from automobile exhausts. This organic chemical is present in water samples collected from areas where gasoline wastes are abundant. The objective of this study was to investigate the possibility of MTBE removal from drinking water at the point of use (POU) by using an Iranian granulated active carbon (GAC) bed.
Materials and Methods: Adsorption of MTBE from drinking water at POU was studied by using an Iranian GAC bed. The water samples treated by this filter adsorber were prepared synthetically at two concentrations (50 ppb and 100 ppb). In addition, the effects of residual chlorine at concentrations of 0.2 and 0.5 mg/L and of chloroform at a concentration of 100 ppb on removal of MTBE were determined.
Results: It was found that this filter adsorber could treat 375 liters of water containing 50 ppb MTBE, 100 ppb chloroform and 0.2 ppm residual chorine. If the residual chlorine content was increased to 0.5 ppb, the volume of water treated would be 335 liters. The filter could t eat 195 liters of water containing 100 ppb MTBE, 100 ppb chloroform and 0.2 ppm residual chlorine to acceptable levels for drinking, provided the amount of MTBE is below the respective standard.
Conclusion: Both residual chlorine and chloroform reduced the MTBE adsorption capacity on GAC due to occupation of adsorption sites. In addition, to the tendency of GAC to adsorb chloroform and chlorine was greater than that of MTBE.
