Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators
المؤلفون المشاركون
Koh, Frank C.
Johnson, Arthur T.
Rehak, Timothy E.
Scott, William H.
المصدر
Journal of Environmental and Public Health
العدد
المجلد 2011، العدد 2011 (31 ديسمبر/كانون الأول 2011)، ص ص. 1-9، 9ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2011-07-18
دولة النشر
مصر
عدد الصفحات
9
التخصصات الرئيسية
الملخص EN
This experiment was conducted to determine how much contaminant could be expected to be inhaled when overbreathing several different types of respirators.
These included several tight-fitting and loose-fitting powered air-purifying respirators (PAPRs) and one air-purifying respirator (APR).
CO2 was used as a tracer gas in the ambient air, and several loose-and tight-fitting respirators were tested on the head form of a breathing machine.
CO2 concentration in the exhaled breath was monitored as well as CO2 concentration in the ambient air.
This concentration ratio was able to give a measurement of protection factor, not for the respirator necessarily, but for the wearer.
Flow rates in the filter/blower inlet and breathing machine outlet were also monitored, so blower effectiveness (defined as the blower contribution to inhaled air) could also be determined.
Wearer protection factors were found to range from 1.1 for the Racal AirMate loose-fitting PAPR to infinity for the 3M Hood, 3M Breath-Easy PAPR, and SE 400 breath-responsive PAPR.
Inhaled contaminant volumes depended on tidal volume but ranged from 2.02 L to 0 L for the same respirators, respectively.
Blower effectiveness was about 1.0 for tight-fitting APRs, 0.18 for the Racal, and greater than 1.0 for two of the loose-fitting PAPRs.
With blower effectiveness greater than 1.0, some blower flow during the exhalation phase contributes to the subsequent inhalation.
Results from this experiment point to different ways to measure respirator efficacy.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Johnson, Arthur T.& Koh, Frank C.& Scott, William H.& Rehak, Timothy E.. 2011. Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators. Journal of Environmental and Public Health،Vol. 2011, no. 2011, pp.1-9.
https://search.emarefa.net/detail/BIM-469173
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Johnson, Arthur T.…[et al.]. Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators. Journal of Environmental and Public Health No. 2011 (2011), pp.1-9.
https://search.emarefa.net/detail/BIM-469173
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Johnson, Arthur T.& Koh, Frank C.& Scott, William H.& Rehak, Timothy E.. Using CO2 to Determine Inhaled Contaminant Volumes and Blower Effectiveness in Several Types of Respirators. Journal of Environmental and Public Health. 2011. Vol. 2011, no. 2011, pp.1-9.
https://search.emarefa.net/detail/BIM-469173
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-469173
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر