Kinetic and product studies of Cl atoms reactions with a series of branched Ketones

The rate constants for the Cl atom reaction with three branched ketones have been measured at 298 ± 2 K and 760 Torr using the relative rate method in the absence of NO. The rate constants values obtained(in units of 10~(-10)cm~3/(molecule·sec)) are: k_(2-methyl-3-pentanone)=1.07 ± 0.26, k_(3-methyl-2-pentanone)= 1.21 ± 0.26, and k_(4-methyl-2-pentanone)= 1.35 ± 0.27. Combining the chemical kinetic data obtained by this study with those reported for other ketones, a revised Structure Activity Relationship(SAR) parameter and R group reactivity(k_R) of R(O)R′and CHx(x = 1, 2, 3) group reactivity(k_(CHx)) toward Cl atoms were proposed. In addition,the products from the three reactions in the presence of NO were also identified and quantified by using PTR-To F-MS and GC-FID, and the yields of the identified products are: acetone(39% ± 8%) + ethanal(78% ± 12%), 2-butanone(22% ± 2%) + ethanal(75% ± 10%) + propanal(14% ± 1%) and acetone(26% ± 3%) + 2-methylpropanal(24% ± 2%), for Cl atoms reaction with 2-methyl-3-pentanone, 3-methyl-2-pentanone and 4-methyl-2-pentanone, respectively.Based on the obtained results, the reaction mechanisms of Cl atoms with these three ketones are proposed.     

2 ,4-二硝基苯肼固相吸附/高效液相色谱法测定车内空气中醛酮类物质

建立了2,4-二硝基苯肼固相吸附／高效液相色谱同时测定车内空气中4种醛酮类物质的方法,研究了固相吸附采样和前处理方法,优化了试验条件。4种醛酮类物质在一定质量范围内工作曲线线性良好,甲醛、乙醛、丙烯醛、丙酮的检出限分别为0．075μg／m^3、0．207μg／m^3、0．715μg／m^3、0．159μg／m^3（按采样体积12L计）,实际样品测定的RSD为7.5％-9．7％。     

郑州市大气环境中醛酮类化合物污染状况初探

在郑州市交通密集区、工业区、居民文化区等不同功能区设置监测点位,分春季、夏季、冬季不同季节对郑州市大气环境中15种醛酮类的污染状况进行初步研究。结果表明,郑州市大气环境中醛酮类主要污染物为甲醛、乙醛和丙酮;醛酮类污染物含量在不同季节的变化趋势是夏季春季冬季;功能区的变化趋势是交通密集区居民区;污染物主要来源于大气中有机物的光化学反应,甲醛与乙醛、甲醛与丙酮有较好的相关性。     

城市大气环境中醛酮类化合物污染状况及变化规律

2003年对郑州市城市环境空气中醛酮类化合物的污染状况及变化规律进行了初步调查研究.结果表明:大气环境中醛酮类污染物的质量浓度范围为未检出～167 μg/m3,主要污染物为甲醛、乙醛和丙酮;醛酮类污染物含量在不同季节的变化趋势是:夏季>春季>冬季;醛酮类污染物主要来源于大气中有机物的光化学反应,甲醛与乙醛、甲醛与丙酮有...