logging in or signing up hansen2 Lassie Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 40 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: October 29, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript EPA NAQC 2005 San Francisco, CA: EPA NAQC 2005 San Francisco, CA Optical Transmissometer: Rapid optical analysis of filter samples for EC and UVPM content Tony Hansen Magee Scientific Company Berkeley, CADiesel Exhaust - Listed Air Toxic: Diesel Exhaust - Listed Air Toxic Toxic Components : Specific Compounds require Specific Chemical Analyses Accompanying components may permit more rapid detection by optical means: Black Soot and UV-Absorbing MaterialAnalytical Premise: Analytical Premise Optically-absorbing material is a surrogate tracer for diesel exhaust. “Black” carbon (‘BC’, ‘EC’) “UV-absorbing material” (‘UVPM’) Optical analysis is fast, sensitive, can be performed in real time or on filter samples.Analytical Method - Optical Absorption: Analytical Method - Optical AbsorptionOptical vs. chemical analyses: Optical vs. chemical analyses “Harvard 6 Cities Study”Analytical Instrument : Aethalometer™: Analytical Instrument : Aethalometer™ While continuously collecting sample, measures optical absorption in real time at 2 wavelengths (880 nm and 370 nm UV) Converts optical absorption to mass concentration of BC and UVPM Real-time data: 1 second / 1 minute / 1 hourAnalytical Instrument : Aethalometer™: Analytical Instrument : Aethalometer™ 19-inch rack mount model“Portable” Aethalometer™: “Portable” Aethalometer™ Battery-powered: 1-, 2- or 7-wave opticsLarge Networks / Baseline Monitoring: Large Networks / Baseline Monitoring The Need: Time-integrated BC measurements at many locations The Problem: Real-time instrumentation is expensiveAnalytical Instrument: Optical Transmissometer: Analytical Instrument: Optical TransmissometerPrinciple of Operation:: Principle of Operation: Performs optical transmission analysis of aerosol samples collected on filter media Optical components and wavelengths are identical to those in the Aethalometer Calculates absorption (‘ATN’) Features:: Features: Accepts 25, 37 and 47-mm diameter filters. Fully automatic operation with second position for reference blank filter. Barcode scanner for sample ID. COM port transmits optical and barcode data to laptop with software provided for direct import into spreadsheet. Optical Transmissometer: accepts 47, 37 and 25 mm. diam. filters: Optical Transmissometer: accepts 47, 37 and 25 mm. diam. filtersApplications:: Applications: Routine analysis of time-integrated filter samples Summary: Summary Black Carbon and UV-Absorbing Carbon are good surrogates for diesel exhaust. The Optical Transmissometer uses the same optical analysis as the Aethalometer to determine the BC and UVPM content of filter-collected samples.Acknowledgments: Acknowledgments Harvard School of Public Health U.S. Environmental Protection Agency For further information: www . mageesci . com You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
hansen2 Lassie Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 40 Category: Entertainment License: All Rights Reserved Like it (0) Dislike it (0) Added: October 29, 2007 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript EPA NAQC 2005 San Francisco, CA: EPA NAQC 2005 San Francisco, CA Optical Transmissometer: Rapid optical analysis of filter samples for EC and UVPM content Tony Hansen Magee Scientific Company Berkeley, CADiesel Exhaust - Listed Air Toxic: Diesel Exhaust - Listed Air Toxic Toxic Components : Specific Compounds require Specific Chemical Analyses Accompanying components may permit more rapid detection by optical means: Black Soot and UV-Absorbing MaterialAnalytical Premise: Analytical Premise Optically-absorbing material is a surrogate tracer for diesel exhaust. “Black” carbon (‘BC’, ‘EC’) “UV-absorbing material” (‘UVPM’) Optical analysis is fast, sensitive, can be performed in real time or on filter samples.Analytical Method - Optical Absorption: Analytical Method - Optical AbsorptionOptical vs. chemical analyses: Optical vs. chemical analyses “Harvard 6 Cities Study”Analytical Instrument : Aethalometer™: Analytical Instrument : Aethalometer™ While continuously collecting sample, measures optical absorption in real time at 2 wavelengths (880 nm and 370 nm UV) Converts optical absorption to mass concentration of BC and UVPM Real-time data: 1 second / 1 minute / 1 hourAnalytical Instrument : Aethalometer™: Analytical Instrument : Aethalometer™ 19-inch rack mount model“Portable” Aethalometer™: “Portable” Aethalometer™ Battery-powered: 1-, 2- or 7-wave opticsLarge Networks / Baseline Monitoring: Large Networks / Baseline Monitoring The Need: Time-integrated BC measurements at many locations The Problem: Real-time instrumentation is expensiveAnalytical Instrument: Optical Transmissometer: Analytical Instrument: Optical TransmissometerPrinciple of Operation:: Principle of Operation: Performs optical transmission analysis of aerosol samples collected on filter media Optical components and wavelengths are identical to those in the Aethalometer Calculates absorption (‘ATN’) Features:: Features: Accepts 25, 37 and 47-mm diameter filters. Fully automatic operation with second position for reference blank filter. Barcode scanner for sample ID. COM port transmits optical and barcode data to laptop with software provided for direct import into spreadsheet. Optical Transmissometer: accepts 47, 37 and 25 mm. diam. filters: Optical Transmissometer: accepts 47, 37 and 25 mm. diam. filtersApplications:: Applications: Routine analysis of time-integrated filter samples Summary: Summary Black Carbon and UV-Absorbing Carbon are good surrogates for diesel exhaust. The Optical Transmissometer uses the same optical analysis as the Aethalometer to determine the BC and UVPM content of filter-collected samples.Acknowledgments: Acknowledgments Harvard School of Public Health U.S. Environmental Protection Agency For further information: www . mageesci . com