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The characteristics of the Arizona Test Dust (ATD) follow the specification of the International Organization for Standardization ISO 12103 1 "Road Vehicles - Test Dust for Filter Evaluation".
Total organic carbon (TOC) levels and turbidity parameters were obtained by adding test dust and humic acid.
For the electrostatic air cleaner, we assumed that the removal efficiency of cat allergen was equivalent to the particle-size specific performance observed for standard test dust and described elsewhere [ 22].
The Hazdust monitor automatically purges the sensor optics with clean air, and re-establishes baseline every 30 min. Prior to initiating the study, the Hazdusts were calibrated against gravimetric filter sampling by EDC using an aerosol generator with SAE fine test dust number ISO12103-1 (Arizona RoaDustst), and a suite of quality assurance checks were performed.
In that work, we found that the removal efficiency of a polydisperse test dust achieved by in-duct devices (specifically, 1-inch, 5-inch, and high efficiency electrostatic) was approximately 10% lower than the rated efficiencies determined according to ASHRAE Method 52.2, an industry standard performance metric [ 36].
To investigate the behaviour of volcanic ash upon reheating, we have performed experiments at ten temperature steps between 700 and 1600°C on (1) fresh volcanic ash from the final explosive phase of the 2010 Eyjafjallajökull (EYJA) eruption and (2) two standard materials used in ingestion tests in the history of turbine testing (MIL E 5007C test sand, MIL; Arizona Test Dust, ATD).
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In the experiments in question, the bodies were isolated flat metallic discs placed normal to the air flow, and the test dusts used were graded samples of brown aloxite.
Based on several rodent studies in which test dusts were administered intratracheally or intrapharyngeally to assess the pulmonary toxicity of manufactured CNTs, these authors concluded that CNTs were capable of producing inflammation, epithelioid granulomas, fibrosis, and biochemical changes in the lungs [ 54– 560 60– 63].
They were not testing dust.
The tested dust concentrations were 100, 200, 400, 800, and 1200 g/m3; hydrogen concentrations varied from 8 to 20 vol. % with 2% step.
They are tested on different types of carpet — plush, shag, Wilton — as well as on various kinds of wood floor, using German-made testing dust (ground from natural material) to conform to European testing standards, and American-made dust (ground from man-made silica sand and mixed with talc) to test the machines bound for the American market.
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