ICARUS Chamber Experiment: Ziemann_20150220_Methyl nitrite/Nitric oxide/5-Decanol_Hydroxyl radical_DOS

Goals:
Determine SOA yield of OH radical oxidation of the VOC
Summary:
Experiments were conducted in an 8.0 m3 FEP Teflon environmental
chamber in Boulder, CO, that was filled with clean, dry air [<5
ppb of hydrocarbons and <1% relative humidity (RH)] from
two Aadco clean air systems and operated at ambient
temperature (?23 °C) and pressure (?630 Torr). The VOC was
added to the chamber by evaporating a measured amount of
the compound from a heated glass bulb into a stream of
ultrahigh-purity (UHP) N2. Approximately 200 ?g m?3 dioctyl
sebacate (DOS) seed particles in UHP N2 were added from an
evaporation?condensation apparatus. Known amounts of
methyl nitrite and NO were prepared on a vacuum manifold
using a calibrated glass bulb and absolute pressure gauge and
then flushed into the chamber with UHP N2. Reactions were
initiated by turning on blacklights that covered two walls of the
chamber at 50% intensity (JNO2 = 0.37 h?1) for one hour. Photolysis of methyl nitrite created OH radicals with an average concentration of 4 × 107 molecules cm?3, as determined from the measured decay
of the VOC and estimated OH reaction rate constants. The
VOC, methyl nitrite, and NO concentrations were 1, 5, and 5
ppm.
Organization: Ziemann
Lab Affiliation: University of Colorado, Boulder, Boulder, CO, USA
Chamber: Janet (Chamber 1)
Experiment Category: Gas phase chemical reaction, Photolysis, any phase, Aerosol formation
Oxidant: Hydroxyl radical
Reactants: Methyl nitrite, Nitric oxide, 5-Decanol
Reaction Type: Photooxidation
Relative Humidity: <1
Temperature: 23
Seed Name: DOS
Pressure: 630

目标：
确定挥发性有机化合物（VOC）中羟基自由基氧化的SOA产率
概述：
本研究在位于科罗拉多州博尔德的8.0立方米FEP特氟龙环境舱内进行，该舱由两个Aadco清洁空气系统提供净化、干燥的空气（烃类浓度低于5 ppb，相对湿度低于1%），并在环境温度（约23°C）和压力（约630 Torr）下运行。挥发性有机化合物通过将一定量的化合物从加热的玻璃泡蒸发至高纯度（UHP）氮气流中添加到舱内。约200微克/立方米的高纯度二辛基亚甲基苯甲酸酯（DOS）种子颗粒通过蒸发-冷凝装置添加到高纯度氮气中。甲基亚硝酸盐和一氧化氮的已知量通过真空集管，使用校准的玻璃泡和绝对压力计制备，然后与高纯度氮气一同注入舱内。通过开启覆盖舱壁两面的黑光灯（强度为50%，JNO2 = 0.37 h?1），持续一小时以启动反应。甲基亚硝酸盐的光解产生了平均浓度为4 × 107分子/立方厘米的羟基自由基，此浓度通过测量VOC的衰减和估计羟基反应速率常数来确定。VOC、甲基亚硝酸盐和一氧化氮的浓度分别为1、5和5 ppm。
组织：齐曼实验室
实验室归属：美国科罗拉多大学博尔德分校，博尔德，科罗拉多州，美国
舱室：珍妮特（舱室1）
实验类别：气相化学反应，光解，任何相态，气溶胶形成
氧化剂：羟基自由基
反应物：甲基亚硝酸盐，一氧化氮，5-癸醇
反应类型：光氧化
相对湿度：<1
温度：23°C
种子名称：DOS
压力：630 Torr