Lü Huixiong, Wen Sheng, Feng Yanli, Wang Xinming, Bi Xinhui, Sheng Guoying, Fu Jiamo
State Key Laboratory of Organic Geochemistry, Key Laboratory of GD for Utilization and Protection of Environmental Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, P.R. China.
Sci Total Environ. 2006 Sep 15;368(2-3):574-84. doi: 10.1016/j.scitotenv.2006.03.044. Epub 2006 Jun 5.
Indoor and outdoor concentration levels of 21 carbonyl compounds and five BTEX (benzene, toluene, ethylbenzene and xylenes) were measured in four hospitals of Guangzhou from 2nd January to 20th March 2004. Samples were collected in five consecutive daytimes for each hospital. Among most of the samples, acetone was the most abundant carbonyl, followed by acetaldehyde, 2-butanone or formaldehyde. Toluene was the most abundant BTEX and the others were at similar levels. The relatively higher acetone concentrations might have resulted from the high level of background in Guangzhou area due to emission of the factories and LPG-fuel vehicles, and also for the special weather conditions during sampling time. The high concentration of acetaldehyde, which was even higher than that of formaldehyde, might be resulted from the wide use of ethanol in hospital. The partial oxidation of ethanol may form acetaldehyde. The indoor concentrations of carbonyls and BTEX were found a little higher than their outdoor counterparts with only a few exceptions, which showed the anthropogenic sources for these compounds. The low correlations between most carbonyls and BTEX concentrations might be caused by their complex sources. Finally, the human exposure levels of formaldehyde and acetaldehyde in hospitals are discussed.
2004年1月2日至3月20日期间，对广州四家医院室内外21种羰基化合物和五种BTEX（苯、甲苯、乙苯和二甲苯）的浓度水平进行了测量。每家医院连续五个白天采集样本。在大多数样本中，丙酮是含量最高的羰基化合物，其次是乙醛、2-丁酮或甲醛。甲苯是含量最高的BTEX，其他BTEX含量相近。丙酮浓度相对较高可能是由于广州地区工厂和液化石油气燃料车辆排放导致背景值较高，以及采样期间的特殊天气条件。乙醛浓度甚至高于甲醛，这可能是由于医院广泛使用乙醇所致。乙醇的部分氧化可能会生成乙醛。除少数例外情况外，羰基化合物和BTEX的室内浓度略高于室外浓度，这表明这些化合物存在人为来源。大多数羰基化合物和BTEX浓度之间的低相关性可能是由其复杂的来源所致。最后，讨论了医院内甲醛和乙醛的人体暴露水平。
