Isotopic source signatures for atmospheric lead:: The Southern Hemisphere
Isotopic source signatures for atmospheric lead:: The Southern Hemisphere
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DOI：
10.1016/s0016-7037(00)00630-x
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发表时间：
2000-10-01
影响因子：
5
通讯作者：
Rosman, KJR
中科院分区：
文献类型：
--
作者：
Bollhöfer, A;Rosman, KJR
1994年至1999年间，在影响南半球的70多个不同地点收集了气溶胶，测量了它们的Pb-206/Pb-207、Pb-208/Pb-207和Pb-206/Pb-204比率和Pb浓度。在非洲、澳大利亚和南美洲的南端发现的比例较低，这可能是由于烷基铅的供应来自一个共同的供应商，如联合奥克特尔。比率向北增加，可能是由于烷基铅的市场份额的变化或工业铅贡献的增加。同位素特征的地理差异使得可以大致描述影响南半球的不同区域。巴西和阿根廷在气溶胶中的Pb-206/Pb-207、Pb-208/Pb-207和Pb-206/Pb-204比值分别为1.141 ~ 1.184、2.416 ~ 2.442和17.77 ~ 18.57。墨西哥气溶胶值分别为1.188 ~ 1.197、2.452 ~ 2.463和18.46 ~ 18.73。在智利取样的气溶胶在南部的比值较低，分别为1.063 ~ 1.094、2.337 ~ 2.373和16.46 ~ 17.13，向北增加。南非的排放特征比值分别为1.067 ~ 1.090、2.340 ~ 2.358和16.53 ~ 16.99。1994-1995年，澳大利亚和新西兰的比率分别为1.060-1.193、2.324-2.445和16.08-18.54。但1997年的波动幅度更小，分别为1.072 ~ 1.112、2.342 ~ 2.398、16.55 ~ 17.36。这些同位素特征对于在全球范围内追踪污染源和气团的运动具有潜在的用途。版权所有爱思唯尔科学有限公司
Aerosols collected between 1994 and 1999 at more than 70 different sites affecting the Southern Hemisphere have been measured for their Pb-206/Pb-207, Pb-208/Pb-207 and Pb-206/Pb-204 ratios and Pb concentrations. Lower ratios are found at the southern tips of Africa, Australia and South America probably due to the supply of alkyllead from a common supplier such as Associated Octel. The ratios increase in a northerly direction probably due to a changing market share in alkyllead or an increasing industrial Pb contribution. The geographical variations in isotopic signatures made it possible to broadly characterize the different regions that influence the Southern Hemisphere. Brazil and Argentina exhibited Pb-206/Pb-207, Pb-208/Pb-207,nd Pb-206/Pb-204 ratios in aerosols of 1.141-1.184, 2.416-2.442 and 17.77-18.57, respectively. Mexican aerosols had values of 1.188-1.197, 2.452-2.463 and 18.46-18.73. Aerosols sampled in Chile had low ratios in the South of 1.063-1.094, 2.337-2.373 and 16.46-17.13 which increased in a northerly direction. Emissions from South Africa were characterized by ratios 1.067-1.090, 2.340-2.358 and 16.53-16.99. In 1994-1995 Australia and New Zealand had ratios of 1.060-1.193, 2.324-2.445 and 16.08-18.54. In 1997 however, the range was narrower: 1.072-1.112, 2.342-2.398 and 16.55-17.36, respectively. These isotopic signatures are potentially useful for tracing sources of pollution and the movement of air-masses on a global scale. Copyright (C) 2000 Elsevier Science Ltd.