High Acetone Concentrations throughout the 0–12 km Altitude Range over the Tropical Rainforest in Surinam     

U. Pöschl  J. Williams  P. Hoor  H. Fischer  P. J. Crutzen  C. Warneke  R. Holzinger  A. Hansel  A. Jordan  W. Lindinger  H. A. Scheeren  W. Peters  J. Lelieveld 《Journal of Atmospheric Chemistry》2001,38(2):115-132

Airborne measurements of acetone were performed overthe tropical rainforest in Surinam(2°–7° N, 54°–58° W, 0–12 kmaltitude) during the LBA-CLAIRE campaign in March1998, using a novel proton transfer reaction massspectrometer (PTR-MS) that enables the on-linemonitoring of volatile organic compounds (VOC) with ahigher proton affinity than water. The measuredacetone volume mixing ratios ranged from 0.1 nmol/molup to 8 nmol/mol with an overall average of 2.6nmol/mol and a standard deviation of 1.0 nmol/mol. Theobserved altitude profile and correlations with CO,acetonitrile, propane and wind direction are discussedwith respect to potential acetone sources. No linearcorrelation between acetone and CO mixing ratios wasobserved, at variance with results of previousmeasurement campaigns. The mean acetone/CO ratio(0.022) was substantially higher than typical valuesfound before. The abundance of acetone appears to beinfluenced, but not dominated, by biomass burning,thus suggesting large emissions of acetone and/oracetone precursors, such as possibly 2-propanol, fromliving plants or decaying litter in the rainforest.  相似文献   

Geophysical Field Pattern in The West Bohemian Geodynamic Active Area     

Švancara  Jan  Gnojek  Ivan  Hubatka  František  Dědáček  Karel 《Studia Geophysica et Geodaetica》2000,44(2):307-326

Regional geophysical data from detailed gravity survey, airborne magnetometry and gamma-ray spectrometry were analysed in order to determine the subsurface extent of contrasting geological bodies and to highlight subtle anomalies which can be related to the occurrence of earthquake swarms. Potential field data were compiled into contour and colour-shaded relief maps suitable for detecting structural tectonic elements. A shaded relief map of the horizontal gradient of gravity was used to detect considerable structural and tectonic features. The results of airborne gamma-ray spectrometry, showing the regional total gamma-ray activity, abundance of uranium, thorium and potassium, were included in this study. Only the two most instructive maps – the total gamma-ray activity and the abundance of potassium are shown. The main line of epicentres Nový Kostel – Poátky coincides well with the N-S configuration of abundances of these natural radioactive elements. The epicentres of micro-earthquakes detected by the local seismological network KRASLICE for the 1991 to 1998 period were plotted in the geophysical maps. The hypocentres of earthquakes in the main epicentral zone at Nový Kostel were projected onto the crustal density model based on the interpretation of seismic reflection profile 9HR and gravity data. The average distance between the Nový Kostel epicentral zone and the seismic profile was 4-5 km. Based on the interpretation of gravity data the hypocentres of the main epicentral zone seem to be associated with the western margin of the Eibenstock - Nejdek (Karlovy Vary) Pluton and, beside that, they follow the depth level where the allochthonnous part of the Saxothuringian Zone is thrust over the European parautochton. A drawing of the geodynamic model of the area is also shown.  相似文献   

电热蒸发—电感耦合等离子体原子发射光谱及其在痕量稀土分析中的应用   总被引：4，自引：0，他引：4  

江祖成  胡斌 《岩矿测试》2000,19(2):122-128

评述了电热蒸发电感合等离子体原子发射光谱分析（ＥＴＶ－ＩＣＰ－ＡＥＳ）联用技术的新近进展及其在痕稀土元素检测中的应用。从原理、分析性能、方法及应用诸方面对以聚四氟乙烯（ＰＴＦＥ）悬本为化学改进剂的氟化辅助电热蒸发（ＦＥＴＶ）－ＩＣＰ－ＡＥＳ新技术作了全面的介绍,引用参考文献２８篇。  相似文献   

手持GPS定位精度及其在物化探测网布设中的应用   总被引：2，自引：3，他引：2  

刘述敏  丁志江  常和平  刘涛 《物探与化探》2005,29(6):545-547

对手持式GPS性能进行了系统测试,并介绍了坐标系转换过程中内置参数的求解方法,通过系统参数校正,能使其定位精度远远大于其标称（10～15 m）值,可以满足中大比例尺物化探测网布设的技术要求.  相似文献   

中国北京和长岛大气颗粒物中铅的同位素丰度比测定     

李冰刘咸德  董树屏VeerleVanLierde FrankVanhaecke FreddyCAdams 《岩矿测试》2005,24(1):7-12

采用高分辨电感耦合等离子体质谱技术(HRICPMS)分析了48个不同季节大气气溶胶颗粒样品中铅同位素丰度(A)比值,为中国城市铅污染源研究提供数据。样品采自中国北京和山东长岛地区(2002～2003年期间不同季节)。A(206Pb/207Pb)和A(208Pb/207Pb)的10次测定精密度为0.05%～0.19%RSD。  相似文献   

电感耦合等离子体质谱法同时测定地质样品中锗碘   总被引：2，自引：8，他引：2  

张培新  黄光明董丽 王冠高孝礼  周康民 《岩矿测试》2005,24(1):36-39

样品用NaOH全熔,热水提取,分取部分溶液通过强酸性阳离子交换树脂,分离溶液中大量的钠离子后,采用电感耦合等离子体质谱法同时测定锗和碘。方法的检出限Ge、I分别为0.043μg/g和0.22μg/g,经土壤国家一级标准物质分析验证,结果与标准值相符,12次测定的RSD均小于10%。  相似文献   

磷酸铈共沉淀原子吸收光谱法测定硫酸钴中的痕量铁     

苏耀东李静  马红梅 《岩矿测试》2005,24(1):43-46

探讨了用CePO4共沉淀火焰原子吸收光谱法测定CoSO4溶液中的痕量Fe3 。共沉淀效率受pH、Ce(NO3)3和H3PO4用量的影响。试验结果表明,在溶液pH为3.0～4.0时,CePO4能够定量共沉淀CoSO4溶液中的Fe3 。对于20mL的样品溶液,方法的检出限为24.8μg/L,铁的加标回收率为101.7%。方法用于CoSO4试剂中Fe3 的测定,6份样品测定的RSD<5%。  相似文献   

阴离子树脂-活性炭分离富集等离子体发射光谱法测定富钴锰结壳中的痕量金银铂钯   总被引：10，自引：1，他引：10  

李展强张汉萍  张学华李其英 李锡坤 《岩矿测试》2005,24(2):141-144

采用717阴离子树脂活性炭联合交换分离富集技术,电感耦合等离子体发射光谱法同时测定富钴锰结壳中痕量金、银、铂、钯。方法检出限四元素分别为:Au1. 3、Ag0. 4、Pd0. 6、Pt4. 8ng/g。样品加标回收率在89. 0% ~110. 3%,相对标准偏差3. 5% ~7. 8% (n=4)。方法已用于富钴锰结壳中痕量金银铂钯的测定。  相似文献   

内标和快速共沉淀-火焰原子吸收光谱法测定食盐中的镉   总被引：3，自引：0，他引：3  

苏耀东  秦立俊李静 陈龙武 《岩矿测试》2005,24(3):201-204

探讨了用火焰原子吸收法测定以（2-吡啶偶氮）-2-萘酚-Ni（Ⅱ）为共沉淀体系，以Mn（Ⅱ）为内标，在pH=9．0的条件下快速共沉淀分离富集食盐中的痕量Cd。当试液为100mL时，方法的检出限为5．7μg/L，加标回收率为96％～101％，相对标准偏差（RSD，n=6）〈5％，基本消除了基体干扰。  相似文献   

Structural Characterisation of Organic Matter in Fine Tropospheric Aerosol by Pyrolysis-Gas Chromatography-Mass Spectrometry     

A. Gelencsér  T. Mészáros  M. Blazsó  Gy. Kiss  Z. Krivácsy  A. Molnár  E. Mészáros 《Journal of Atmospheric Chemistry》2000,37(2):173-183

The organic matter in tropospheric aerosol plays animportant, yet undetermined role in atmosphericprocesses. The bulk of organic carbon representing asignificant part of the fine aerosol mass is bound toa polymeric matter whose structure and properties areto date largely unknown. Here we use thefingerprinting technique of derivatization pyrolysis-gas chromatography-massspectrometry tosubstantiate that in terms of chemical structure partof this polymer in rural aerosol in summer can beregarded as natural humic matter. We suggest thatthese compounds are likely to be directly emitted bybiogenic sources.  相似文献