中文摘要：

对浙江嘉兴农场的大气羰基化合物水平进行了研究，利用液相双质谱（LC-MS／MS）进行样品分析，检测出32种羰基化合物．结果表明，甲醛、乙醛、壬醛/2-壬酮和十二醛为最为丰富的羰基化合物，其平均浓度分别为13．99，8．76，7．77，7．13μg／m^3,分别占羰基化合物总量的18．29％，11．45％，10．16％，9．32％．光化学反应和植物排放，尤其是水稻的排放，是嘉兴农场大气羰基化合物的主要来源；水稻收割活动还是乙醛和己醛的另一个来源．羰基化合物之间的相关性分析表明，甲醛与乙醛之间有显著线性相关（r=0．58P〈0．01）表明甲醛和乙醛有共同来源；庚醛与乙醛及其他高分子的羰基化合物之间相关性）HD．70，表明庚醛与乙醛及其他高分子的羰基化合物亦有相同来源；十一醛、十二醛、十三醛、辛醛、癸醛和壬醛／2-壬酮之间的线性相关在0．95,-0.99范围（P〈O．01），表明其来源极为一致．

英文摘要：

Air samples were collected from one farm in Jiaxing, Zhejiang Province and analyzed for carbonyl compounds. The carbonyl compounds concentrations were determined by liquid chromatography-tandem mass spectrometry （LC-MS/MS） and 32 carbonyls species were quantified. Formaldehyde, acetaldehyde, nonanaldehyde/2-nonanone and dodecanal were the most abundant species with mean concentrations of 13.99, 8.76, 7.77 and 7.13μg/m3, and accounted for 18.29%, 11.45%, 10.16% and 9.32% of the total carbonyls, respectively. Photochemical reaction and plant emission, in particular for rice emission, were main sources of atmospheric carbonyl compounds in the farm of Jiaxing. Rice harvest activity was another source of acetaldehyde and hexaldehyde. There was a significant linear correlation between formalddehyde and acetaldehyde （r-=0.58, P〈0.01）, which showed that they had common sources. The significant correlations between heptaldehyde with acetaldehyde and other high-molecular-weight carbonyl compounds were observed （r〉0.70, P〈0.01）, and the correlation coefficients of nonanaldehyde/2-nonanone, octylaldehyde, decaldehyde, undecanal, dodecanal and tridecanal were in the range of 0.95-0.99（P〈0.01）, which indicated that these high-molecular-weight carbonyls （C≥7） had same sources. Rice emission was considered to be their main common source.