二羟基苯甲酸的硅烷化及其在气质联用测量气相OH自由基的应用  

SILANIZATION OF DHBAs AND MEASUREMENT OF GAS PHASE HYDROXYL RADICALS USING GAS CHROMATOGRAPHY-MASS SPECTROMETRY

作　　者：姚波[1] 朱彤[1] 林伟立[1] 

机构地区：[1]北京大学环境学院环境模拟与污染控制国家联合重点实验室

出　　处：《环境化学》2006年第6期772-775,共4页Environmental Chemistry

基　　金：国家自然科学基金资助项目(49925513;20407001).

摘　　要：通过优化GC-MS参数有效分离了水杨酸(SA)及其羟基化产物2,3-DHBA和2,5-DHBA的硅烷化产物,检测限分别为10.2 fmol和9.9 fmol.采用浸渍膜捕集OH标准源发生体系产生的OH自由基,测得气相OH自由基与固相SA反应生成的2,3-DHBA和2,5-DHBA的产率分别为52%和48%.因此,SA捕集-硅烷化衍生-气质联用测量方法研究大气OH自由基有很好的应用前景.This study developed a measurement method of OH radicals in the atmosphere using salicylic acid（SA） to trap OH radicals and then GC-MS to analyze the trimethylsilyl （TMS） derivatives of the reaction products of SA and OH： dihydroxybenzonic acid（DHBA）. By optimizing GC-MS parameters, the TMS derivatives of SA and DHBAs were well separated and the detection limits of 10. 2 fmol and 9.9 fmol were obtained for the TMS derivatives of 2,3-DHBA and 2,5-DHBA. After using SA soaked filters to collect OH radicals from an OH generating sources, 2,3-DHBA and 2,5-DHBA were extracted from the filters and converted to TMS derivatives, which were measured with GC-MS and the production yields of 2,3-DHBA and 2,5-DHBA from the gas phase OH radical reaction with solid phase SA on filter were determined as 52% and 48%.

关 键 词：OH自由基 二羟基苯甲酸 气质联用 水杨酸 硅烷化 

分 类 号：X132[环境科学与工程—环境科学]