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261.
Alfred B. Craig 《Journal of the Air & Waste Management Association (1995)》2013,63(10):927-929
The Control Systems Laboratory (CSL) of the Environmental Protection Agency has been developing improved technology for the control of participate emissions from stationary sources for nearly ten years. Starting about three years ago, emphasis has been gradually shifted to the study of fine particulate which we define as solid or liquid particles less than about 3µ in diameter. Rationale for this shift in emphasis is covered in Mr. Harrington’s Keynote Paper. 相似文献
262.
Alfred Micallef Chris N. Deuchar Jeremy J. Colls 《Journal of the Air & Waste Management Association (1995)》2013,63(8):757-762
ABSTRACT An electronically controlled lift system carrying a realtime particle monitor has been developed for sampling air sequentially, at different heights within the breathing zone. Data are automatically logged at the different receptor levels, for the determination of average vertical concentration profiles of airborne particulate matter. The system is easy to operate, portable, and easily extended to different heights or modified for use with other types of monitors (e.g., a portable CO analyzer). For measuring airborne particle concentrations, a Grimm Dust Monitor 1.104/5 was used. The results of trial runs, which were carried out indoors and in a relatively open semi-rural area, are presented, and applications of the kinetic sequential sampling (KSS) system are discussed. 相似文献
263.
Steven S. Cox Alfred T. Hodgson 《Journal of the Air & Waste Management Association (1995)》2013,63(8):1195-1201
ABSTRACT The initial solid-phase concentration of volatile organic compounds (VOCs) is a key parameter influencing the emission characteristics of many indoor materials. Solid-phase measurements are typically made using solvent extraction or thermal headspace analysis. The high temperatures and chemical solvents associated with these methods can modify the physical structure of polymeric materials and, consequently, affect mass transfer characteristics. To measure solid-phase concentrations under conditions resembling those in which the material would be installed in an indoor environment, a new technique was developed for measuring VOC concentrations in vinyl flooring (VF) and similar materials. A 0.09-m2 section of new VF was punched randomly to produce ~200 0.78-cm2 disks. The disks were milled to a powder at -140 °C to simultaneously homogenize the material and reduce the diffusion path length without loss of VOCs. VOCs were extracted from the VF particles at room temperature by fluidized-bed desorption (FBD) and by direct thermal desorption (DTD) at elevated temperatures. The VOCs in the extraction gas from FBD and DTD were collected on sorbent tubes and analyzed by gas chromatog-raphy/mass spectrometry (GC/MS). Seven VOCs emitted by VF were quantified. Concentration measurements by FBD ranged from 5.1 |ig/g VF for n-hexadecane to 130 |Jg/g VF for phenol. Concentrations measured by DTD were higher than concentrations measured by FBD. Differences between FBD and DTD results may be explained using free-volume and dual-mobility sorption theory, but further research is necessary to more completely characterize the complex nature of a diffusant in a polymer matrix. 相似文献
264.
Alfred S. Likuku 《Water, Air, & Soil Pollution: Focus》2009,9(3-4):179-184
Activities of 210Pb carrier aerosols in an age-graded Sitka spruce conifer, three deciduous (oak, lime and sycamore) foliage and in rain and throughfall samples have been measured during the period of 2001–2002. The 210Pb concentrations in the age-graded Sitka leaf needles have shown to accumulate until a steady state between accretion and loss of particulate matter is maintained with time. Similarly, the concentrations of 210Pb on deciduous tree leaves increased with time until the leaves began to senesce. The 210Pb inventory in bulk precipitation was significantly (r 2?=?0.99; P?<?0.001) large compared with that in throughfall samples, as indicated by a ratio of 1 to 0.1 of 210Pb deposition in bulk precipitation to throughfall. This suggests that 210Pb is retained in the Sitka spruce foliage during deposition until transfer to the ground mainly through litterfall. These findings suggest that the presence of woodland is responsible for enhanced 210Pb deposition fluxes beneath wooded areas relative to open grassland soils. 相似文献
265.
Alfred Becker Volker Wenzel Valentina Krysanova Werner Lahmer 《Environmental Modeling and Assessment》1999,4(4):243-257
The paper introduces an approach for the analysis of global change impacts on river basins or regions. This approach is quite general and can be transferred to any region or river basin of interest on earth. The first application of the approach was in the Elbe river basin, with primary focus on the hydrologic model part and on the integration of crop growth and nitrogen dynamics. Finally, concepts for the integration of socio-economic aspects in the analysis are introduced. 相似文献
266.
Musah Mohammed Mensah Isaac Adjei Alfred Morrison Mahmood Haider Murshed Muntasir Omari-Sasu Akoto Yaw Boateng Frank Nyeadi Joseph Dery Coffie Cephas Paa Kwesi 《Environmental science and pollution research international》2022,29(21):31330-31347
Environmental Science and Pollution Research - One of the most commonly debated concerns regarding foreign direct investment inflows is the associated environmental adversities that accompany the... 相似文献