Measurements of biogenic hydrocarbons and carbonyl compounds emitted by trees from temperate warm Atlantic rainforest, Brazil
Measurements of biogenic hydrocarbons and carbonyl compounds emitted by trees from temperate warm Atlantic rainforest, Brazil
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DOI：
10.1039/b414881a
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发表时间：
2005-01-01
影响因子：
--
通讯作者：
Pisani, SO
中科院分区：
文献类型：
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作者：
Carvalho, LRF;Vasconcellos, PC;Pisani, SO
这项研究是一个为期三年的项目的一部分，该项目旨在研究圣保罗市大都市区 (MASP) 温带温暖大西洋雨林树木的生物挥发性有机化合物 (VOC) 排放。在这项工作之前，尚未对巴西温带温暖大西洋雨林中植物物种的挥发性有机化合物排放率进行研究。选择了 11 个物种（Alchornea sidifolia、Cupania oblongifolia、Cecropia pachystachia、Syagrus romanzoffiana、Casearia sylvestris、Machaerium villosum、Trema micrantha、Croton floribundus、Myrcia rostrata、Solanum eranthum 和 Ficus insipida），其中一些在城市、地区进行了研究。 MASP 内的郊区和森林地区，以评估具有不同排放源特征的地点的生物 VOC 成分。生物源 VOC 排放量的测定方法是将植物的枝条放入动态封闭系统（全聚四氟乙烯比色皿）中，并对离开比色皿的空气中的化合物进行采样。使用吸附剂预浓缩保留 VOC，然后在样品热解吸后使用 GC-MS 来测定生物碳氢化合物的含量。使用 2,4-二硝基苯肼涂层硅胶收集羰基化合物，然后进行 HPLC-UV 分析低分子量羰基化合物。异戊二烯、α-蒎烯、莰烯和柠檬烯的排放率范围为0.01至2.16 μg C h(-1) g(-1)，醛类(C-2-C-6)、丙烯醛、甲基丙烯醛和2-丁酮的排放率范围为1.5 x 10(-2)至2.3 μg C h(-1) g(-1)。实验期间监测了环境和叶片温度、相对湿度、光强度、当地大气中的 O-3 和 NOx 水平。可以识别温带温暖大西洋雨林典型植物排放的不同生物挥发性有机化合物。排放率报告为调查地点类型的函数，并且仅针对其定量的化合物提供。阳离子是可行的。其他生物化合物仅被鉴定出来。
This study is part of a three-year project on biogenic volatile organic compound (VOC) emissions from trees of the temperate warm Atlantic rainforest found in the metropolitan area of Sao Paulo City ( MASP). No study of VOC emission rates from plant species has been carried out in the temperate warm Atlantic rainforest of Brazil prior to this work. Eleven species were selected (Alchornea sidifolia, Cupania oblongifolia, Cecropia pachystachia, Syagrus romanzoffiana, Casearia sylvestris, Machaerium villosum, Trema micrantha, Croton floribundus, Myrcia rostrata, Solanum erianthum and Ficus insipida) and some of them were studied in urban, sub-urban and forest areas inside the MASP in order to evaluate biogenic VOC composition at sites characterized by different emission sources. Biogenic VOC emissions were determined by placing branches of plants in a dynamic enclosure system, an all-Teflon cuvette, and by sampling the compounds in the air leaving the cuvette. Pre-concentration using adsorbents to retain the VOC, followed by GC-MS after thermal desorption of the sample, was employed to determine the amount of biogenic hydrocarbons. The collection of carbonyl compounds on a 2,4-dinitrophenylhydrazine coated silica followed by HPLC-UV was used to analyze low molecular weight carbonyl compounds. Emission rates of isoprene, α-pinene, camphene and limonene ranged from 0.01 to 2.16 μ g C h(-1) g(-1) and emission rates of aldehydes (C-2-C-6), acrolein, methacrolein and 2-butanone ranged from 1.5 x 10(-2) to 2.3 μ g C h(-1) g(-1). Ambient and leaf temperatures, relative humidity, light intensity, O-3 and NOx levels in the local atmosphere were monitored during experiments. It was possible to identify different biogenic VOCs emitted from typical plants of temperate warm Atlantic rainforest. The emission rates were reported as a function of the type of site investigated and were only provided for compounds for which quanti. cation was feasible. Other biogenic compounds were only identified.