東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

A Passive Air Sampler for Precise, S...

McLagan, David Scott.

FindBook

Google Book

Amazon

博客來

A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization./
作者:	McLagan, David Scott.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	313 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
Contained By:	Dissertation Abstracts International79-12B(E).
標題:	Environmental science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10747484
ISBN:	9780438187399

A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization.
McLagan, David Scott.

A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 313 p.

Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.

Thesis (Ph.D.)--University of Toronto (Canada), 2018.

This thesis describes the design, testing and implementation of a novel, inexpensive, high precision passive air sampler (PAS) for gaseous mercury (Hg) monitoring. The PAS uses a sulfur-impregnated activated carbon as a sorbent, a commercially available, radial diffusive barrier (RadielloRTM), and a protective shield that doubles as a storage and transport container. The diffusive barrier and protective shield also help reduce variability in uptake kinetics that can be caused by wind and precipitation. An initial outdoor calibration in Toronto revealed highly linear uptake over a one-year period and unprecedented precision. Small, but predictable effects on uptake kinetics caused by temperature and wind speed were determined in laboratory experiments. The diffusive barrier was also deemed reusable after cleaning. A study evaluating the accuracy of the PAS against industry standard active instrument at 20 global sites determined (i) the recommended sampling rate (volume of air stripped of gaseous Hg per unit time; 0.135 +/- 0.013 m3 day -1) that can be adjusted for the measured temperature and wind speed during each deployment, (ii) the excellent precision based uncertainty (4 +/- 3 %), and (iii) the average overall uncertainty is at most (9 +/- 6 %); a conservative measure due to inherent active instrument uncertainties. The analytical method (thermal decomposition, amalgamation, and atomic absorption spectrometry) was improved by the addition of sodium-carbonate to samples, which prolongs the life of the analytical instrument's catalyst. Two source characterization studies (at a former Hg mine and across the Greater Toronto Area) demonstrate the PAS's ability to successfully monitor concentration gradients and to estimate emissions. The results produced in this thesis are indicative of the PAS's ability to measure at both background and high concentration sites with exceptional accuracy and precision, and its potential to improve atmospheric Hg science globally.

ISBN: 9780438187399Subjects--Topical Terms:

677245
Environmental science.

A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization.
LDR:03037nmm a2200313 4500 001 2201950
005 20190503113353.5
008 201008s2018 ||||||||||||||||| ||eng d
020 $a 9780438187399
035 $a (MiAaPQ)AAI10747484
035 $a (MiAaPQ)toronto:17293
035 $a AAI10747484
040 $a MiAaPQ $c MiAaPQ
100 1 $a McLagan, David Scott. $3 3428701
245 1 2 $a A Passive Air Sampler for Precise, Spatially Distributed Atmospheric Gaseous Mercury Monitoring and Source Characterization.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 313 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-12(E), Section: B.
500 $a Advisers: Frank Wania; Carl PJ Mitchell.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2018.
520 $a This thesis describes the design, testing and implementation of a novel, inexpensive, high precision passive air sampler (PAS) for gaseous mercury (Hg) monitoring. The PAS uses a sulfur-impregnated activated carbon as a sorbent, a commercially available, radial diffusive barrier (RadielloRTM), and a protective shield that doubles as a storage and transport container. The diffusive barrier and protective shield also help reduce variability in uptake kinetics that can be caused by wind and precipitation. An initial outdoor calibration in Toronto revealed highly linear uptake over a one-year period and unprecedented precision. Small, but predictable effects on uptake kinetics caused by temperature and wind speed were determined in laboratory experiments. The diffusive barrier was also deemed reusable after cleaning. A study evaluating the accuracy of the PAS against industry standard active instrument at 20 global sites determined (i) the recommended sampling rate (volume of air stripped of gaseous Hg per unit time; 0.135 +/- 0.013 m3 day -1) that can be adjusted for the measured temperature and wind speed during each deployment, (ii) the excellent precision based uncertainty (4 +/- 3 %), and (iii) the average overall uncertainty is at most (9 +/- 6 %); a conservative measure due to inherent active instrument uncertainties. The analytical method (thermal decomposition, amalgamation, and atomic absorption spectrometry) was improved by the addition of sodium-carbonate to samples, which prolongs the life of the analytical instrument's catalyst. Two source characterization studies (at a former Hg mine and across the Greater Toronto Area) demonstrate the PAS's ability to successfully monitor concentration gradients and to estimate emissions. The results produced in this thesis are indicative of the PAS's ability to measure at both background and high concentration sites with exceptional accuracy and precision, and its potential to improve atmospheric Hg science globally.
590 $a School code: 0779.
650 4 $a Environmental science. $3 677245
650 4 $a Atmospheric chemistry. $3 544140
650 4 $a Atmospheric sciences. $3 3168354
690 $a 0768
690 $a 0371
690 $a 0725
710 2 $a University of Toronto (Canada). $b Physical and Environmental Sciences. $3 3346298
773 0 $t Dissertation Abstracts International $g 79-12B(E).
790 $a 0779
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10747484