Perchloroethylene, the most widely used solvent in dry cleaning, is toxic to the liver, kidneys and central nervous system and may be a human carcinogen. An exposure assessment was carried out in 69 dry-cleaning shops using perchloroethylene in Tehran city, Iran. The 8-h time weighted average (TWA) breathing zone air samples and end-exhaled air samples were obtained from 179 workers who worked ...

The objective of this study is to assess the external and internal exposures to aromatic hydrocarbons in the cistern cleaning and cistern mechanic repair processes at a coke plant. 149 workers engaged as operators in cistern cleaning and cistern mechanic repair processes and 35 non-exposed subjects were examined. Personal analyses of the benzene, toluene, xylene isomers, ethylbenzene, PAH’s and...

Flotation is the most important process for concentrating mineral ores. This process may occur in any vessel such as column flotation, which has been used widely during the last decade and the conventional flotation cells. The effect of superficial feed velocity on the copper recovery was investigated using pilot-scale column flotation of "Sarcheshmeh Capper Complex". The results were compa...

THE MYCOFLORA OF THE ENVIRONMENT wheat conditioning, milling and screening, and filling zone, as well as, raw material -wheat-, intermediate product -grits- and end product -flour- on day 1, and after cleaning improvements -days 45 and 90- were studied in an Argentine wheat mill. Samples were incubated at 28°C for 5-7 days on Malt Extract Agar with chloramphenicol (100 mg L(-1)) and the results...

According to the research reports from the FM (Factory Mutual) Insurance Company, for the past two decades most of the incidents that occurred in semiconductor plants were identified as “Fire Cases.” These reports claimed the fires in Wet Chemical Cleaning Processes were mainly caused by heater failure, yet, based on the process conditions, a heater is designed to shut down automatically when t...

BACKGROUND Cervical Papanicolaou (Pap) smear screening is an effective method of detecting cytological changes in the cervix before they lead to cervical cancer. However, the quality of a Pap smear can be compromised by inflammatory exudate, inadequate cellularity or failure to sample the transformation zone. We evaluated the effect of routine cervical cleaning on Pap smear quality. METHODS I...

Residential and commercial gaseous air cleaning technologies have not gained wide acceptance in the marketplace, in part due to the lack of performance data from field tests or simulation studies. This paper describes a field study of the performance of two gaseous air cleaners in a single room test house and simulations based on these tests with an indoor air quality model (CONTAMW). Air clean...