Organic Geochemical Studies on Airborne Particulates in Lanzhou City— Ⅱ·Composition and distribution of ketone and alcohol lipid compounds
-
摘要: 首次对兰州市大气飘尘中酮和醇脂类化合物进行了分析和研究。结果表明，兰州市大气飘尘中正烷基-２-酮和直链烷基醇的浓度分别为２０～２７０ｎｇ·ｍ－３和５２０～９１０ｎｇｍ－３，并表现为３月份高于７月和８月份，这与兰州市特殊的地形和气候条件有关；其分布特征指示了它们来自人为活动、微生物和现代高等植物，而且它们在这３种来源中所占的比例分别为２．８%～１９．７%、１５．４%～３４．６%和５０．３%～８１．８%。甾醇化合物的浓度很低，它们由现代生物所提供。丰富的Ｃ１８类异戊二烯酮化合物的存在，反映了大气飘尘中有机质在大气氧化过程中已经被改造。Abstract: In this paper, ketone and alcohol lipid compounds in airborne particulates from Lanzhou city have been analy sed and studied.The concent rations of n-alkan-2-ones and n-alkanols are 20-270 ng.m-3 and 520-910 ng.m-3, respectively.They have higher concent rations in March than in July and August, which is related to special topog raphy and climate of Lanzhou area.The dist ribution of these compounds indicates that they are derived anthropogenic activity, microbes and modern higher plants and the assignment of their sources is 2.8 %～ 19.7 % fo r anthropogenic acitivity, 15.4 %～ 34.6 % for microbes and 50.3 %～ 81.8 % for modern higher plant s.Sterols are present at low concent rations,which are provided by modern organisms.The presence of abundant C18 isoprenoid ketone shows that org anic mat ter in airborne particulates f rom Lanzhou city is transformed in the oxidizing process of the atmosphre.
-
[1] 1 M at sumoto G, Hany T.Organic consti tuent s in atmospheric f allout in the Tokyo area.Atmos.Environ., 1980,14 :1409～1419
2 Simonei t B R T, Mazurek M A.Organic matt er of the troposphere-Ⅱ·Natural background of biogenic lipid matter in acrosols over the rural w est ern Uni ted St at es.Atmos.Envi ron., 1982, 16 :2139 ～2159
3 张健, 盛国英, 傅家谟.低对流层中不同高度大气尘埃类脂质的特征.沉积学报, 1991, 增刊:187～196
4 Simonei t B R T, Sheng G,C hen X, et al.M olecular marker study of extractable organic mat ter in aerosols f rom urban areas of China.Atmos.Environ., 1991, 25A(10):2 111～2 119
5 彭林, 沈平.兰州市大气飘尘中正烷烃分布特征.沉积学报, 1996,14(增刊):192～197
6 段毅, 彭林, 曹曼琳等.兰州市大气沉降物和飘尘的有机地球化学研究— Ⅰ·可溶有机质通量及正构烷烃和脂肪酸分布特征.沉积学报, 1997, 15(增刊):153～156
7 Volkman J K, Farringt on J W, Gagosian R B, et al.Lipid composition of coastal marine sediment s f rom the Peru upwelling region.In :Advances in Organic Geochemistry.Wiley:Chichester, 1981.228 ～240
8 Leif R N,Simoneit B R T.Ketones in hydrothermal pet roleums and sediment extracts from guaymas basin, gulf of Calif ornia.Org Geochem., 1995, 23(10):889～904
9 Simoneit B R T, Cox R E, S tandley L J.Organic mat ter of the t ropospere-Ⅳ·Lipids in Harmatt an aerosols of Nigeria.Atmos Environ., 1998, 22(5):983～1 004
10 段毅, 崔明中, 马兰花等.我国海洋沉降物质的有机地球化学研究— Ⅱ·酮、醛和醇脂类化合物组成特征的地球化学意义.科学通报, 1997, 42(19):2 086～2 089
11 段毅, 罗斌杰, 陈宁.南沙海洋沉积物中甾醇化合物的成因.海洋学报, 1995, 17 :123～129
12 段毅, 崔明中, 马兰花.南沙海洋中大陆坡沉积中甾烷醇的地球化学研究.地球化学, 1998, 27(1):74～80 -
点击查看大图
计量
- 文章访问数: 576
- HTML全文浏览量: 12
- PDF下载量: 448
- 被引次数: 0
下载:
