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Sci Total Environ

Title:		Characterization of BTEX group of VOCs and inhalation risks in indoor microenvironments at small enterprises
Author(s):		El-Hashemy MA; Ali HM;
Address:		"Chemistry Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Aljouf, Saudi Arabia; Air Pollution Research Department, Environmental Research Division, National Research Centre, 12622, Egypt. Electronic address: mohammed_elhashmy@yahoo.com. Chemistry Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Aljouf, Saudi Arabia; Forensic Chemistry Department, Forensic Medicine Authority, Egypt"
Journal Title:		Sci Total Environ
Year:		2018
Volume:		20180720
Issue:
Page Number:		974 - 983
DOI:		10.1016/j.scitotenv.2018.07.157
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Concentrations of BTEX group (benzene, toluene, ethylbenzene and xylene) were measured in indoor and outdoor environments at four printing shops and two photocopy centers in Sakaka city, KSA. Fifty four BTEX samples were collected using passive diffusion monitors (SKC VOC 575) and analyzed by GC-MS. The results showed that toluene was the most prevailing compound within the BTEX group and its indoor levels were much higher than outdoor. The average indoor concentrations (mug/m(3)) ranged from 2.45 to 14.66, 81.59 to 955.65, 11.19 to 97.35, 35.66 to 291.88 and 3.90 to 28.39 for benzene, toluene, ethylbenzene, m/p-xylene and o-xylene, respectively. The indoor/outdoor ratios of concentrations of BTEX species were more than one in most cases, indicating the effect of indoor emission sources. Based on (Toluene/Benzene) ratios, all sites were affected by the traffic emissions. Ventilation efficiency, ink type and outdoor pollutant concentration are responsible for results disparity. Cancer and non-cancer risks were assessed in the indoor environments by calculating the lifetime cancer risk (LCR) and hazard ratio (HR), respectively. For benzene and ethylbenzene measured concentrations, LCR values were more than the acceptable USEPA risk level of 1?ª+x?ª+10(-6). HR values for BTEX species were in general lower than the threshold limit of one"
Keywords:		"Air Pollutants/*analysis Air Pollutants, Occupational/*analysis Air Pollution, Indoor/*analysis/statistics & numerical data Benzene/analysis Benzene Derivatives/*analysis Cities Environmental Monitoring Humans Inhalation Exposure/*statistics & numerical d;"
Notes:		"MedlineEl-Hashemy, Mohammed A Ali, Hazim M eng Netherlands 2018/09/27 Sci Total Environ. 2018 Dec 15; 645:974-983. doi: 10.1016/j.scitotenv.2018.07.157. Epub 2018 Jul 20"