BACKGROUND Toluene is a volatile organic compound, one of 189 hazardous air pollutants (HAPs) and the most important pollutant found in most industries and indoor environments; owing to its adverse health, toluene must be treated before being released into the environment. METHODS In this research study, a continuous-flow system (including an air compressor, silica gel filters and activated c...

background: toluene is a volatile organic compound, one of 189 hazardous air pollutants (hap s ) and the most important pollutant found in most industries and indoor environments; owing to its adverse health, toluene must be treated before being released into the environment. methods : in this research study, a continuous-flow system (including an air compressor, silica gel filters and activate...

Light membranes composed of single-walled carbon nanotubes (SWNTs) can serve as efficient nanoscale vessels for encapsulation of tetrafluoromethane at 300 K and operating external pressure of 1 bar. We use grand canonical Monte Carlo simulation for modeling of CF4 encapsulation at 300 K and pressures up to 2 bar. We find that the amount of adsorbed CF4 strongly depends on the pore size in nanot...

A new protocol was used to measure the quantity of reactive organic gases (ROG) being emitted from animal feeding operations (AFO) such as feed yards, dairies and poultry houses. The protocol makes use of a portable gas chromatograph (GC) that is brought to the field where actual measurements are taken in conjunction with the EPA flux chamber sampling protocol. To have the analyte concentration...

While air sampling techniques using adsorbent-based collection, thermal desorption and chromatographic analysis have found a niche in ambient air sampling, occupational applications have been more limited. This paper evaluates the use of thermal desorption techniques for low flow active and passive sampling configurations which allow conveniently long duration sampling in occupational settings ...

The overall aim of our investigation was to quantify the magnitude and range of individual personal exposures to a variety of air toxics and to develop models for exposure prediction on the basis of time-activity diaries. The specific research goals were (1) to use personal monitoring of non-smokers at a range of residential locations and exposures to non-traffic sources to assess daily exposur...

ion increases the {(k1+ k 0 2)/(k 0 3+k 0 4)} ratios markedly, from 0.03 for surface-mediated pathways to 0.14 for OHmediated pathways (Table 1). H2O also leads to lower k 0 5/k 0 1 ratios (4.3 without H2O; 0.63 for OH-mediated pathways; Table 1), which is consistent with the preferential enhancement of CH4 over C2H4 activation rates by OH-mediated routes. Surfaces oxidize C2H4 (k 0 5) more eff...

Apple Bravo de Esmolfe original from the parish of Esmolfe is cultivated in specific regions of Portugal. This cultivar of medium to low production requires very low temperatures, but it is extremely sensitive to frost. The aim of this work was to evaluate the influence of modified atmosphere on the quality of apple (cv. Bravo de Esmolfe) during cold storage. Apples packed in modified atmospher...

After treated, sewage can be reused for different purposes such as production processes, cleaning, irrigation and others. Depending on the type of treatment they result in an effluent with a high pH (> 10.0), which is necessary to decrease because it exceeds the maximum permissible average limit (LMPP) of the Cuban standards of wastewater discharge to the coastal and marine waters (NC 521:2007)...