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Abstract  

A study was undertaken to assess the air quality of Lahore by the elemental analysis of air conditioner (AC) filter dust samples collected from 15 different commercial sites. Samples were prepared using the Leeds Public Analyst Method and were analyzed using instrumental neutron activation analysis (INAA) for up to 31 elements. The elements Al, As, Ba, Ce, Co, Cr, Cs, Fe, Hf, K, La, Lu, Mn, Na, Nd, Rb, Sc, Sm, Sn, Ta, Th, Yb and Zn were detected in all 15 samples whereas the remaining elements have been detected in fewer samples; i.e. Mg, Sb and Tb were detected in 14 samples, Br and V in ten samples, U in nine samples and Ca and Ti in eight samples only. Al, Ca, Fe, K, Mg and Na were determined in all samples at percentage levels. The concentrations of most elements were found to lie around the mean values for the 15 samples studied and were not orders of magnitude different. However the concentrations of Ca, Mg, Sn and Zn were found to be more variable and were found to be dependant on activities such as construction, fruit and vegetable handling, tin plating and transport, respectively.

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Abstract  

Radon maps for each county in New York State have been developed onthe township level indicating the percent of homes with .148 Bq/m 3 (4 pCi/l)in the indoor air of the basement and living area. Estimates are based ona combination of nearly 45,000 basement-screening measurements and correlationsto surficial geology. Many of the towns and cities in the State with the highestaverage indoor radon concentrations are located on highly-permeable gravellysoils formed during the retreat of the Wisconsinan Glaciation. As many towns(32% of total) had .5 measurements, a project to obtain additional measurementsin high-risk towns produced results comparable to estimates based on correlationsto surficial geology. Radon risk maps for each county have been distributedto municipal governments, schools, and professionals in activities relatedto homes, buildings, and indoor air quality.

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Abstract  

A biomonitoring study, using transplanted lichens Flavoparmelia caperata, was conducted to assess the indoor air quality in primary schools in urban (Lisbon) and rural (Ponte de Sor) Portuguese sites. The lichens exposure period occurred between April and June 2010 and two types of environments of the primary schools were studied: classrooms and outdoor/courtyard. Afterwards, the lichen samples were processed and analyzed by instrumental neutron activation analysis (INAA) to assess a total of 20 chemical elements. Accumulated elements in the exposed lichens were assessed and enrichment factors (EF) were determined. Indoor and outdoor biomonitoring results were compared to evaluate how biomonitors (as lichens) react at indoor environments and to assess the type of pollutants that are prevalent in those environments.

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interests of improving indoor air quality, fresh air quantities have been increasing, with associated increases in heating energy consumption in cold climates. Solar air heaters are simple devices to heat air by utilizing solar energy. Such heaters are

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