建立了罐采样-冷柱温-气相色谱质谱法测定环境空气中13种醛酮类化合物的方法,采用全扫描模式(SCAN)和选择性离子模式(SIM)同时进行测定,内标法定量。结果表明:当取样量为400 m L时,13种醛酮类化合物在0.005~75.2 nmol·mol^(-1)的...建立了罐采样-冷柱温-气相色谱质谱法测定环境空气中13种醛酮类化合物的方法,采用全扫描模式(SCAN)和选择性离子模式(SIM)同时进行测定,内标法定量。结果表明:当取样量为400 m L时,13种醛酮类化合物在0.005~75.2 nmol·mol^(-1)的浓度范围内具有良好的线性关系,平均相对响应因子的RSD均小于15.0%,方法检出限为0.005~0.10 nmol·mol^(-1);在0.5、5.0、20.0 nmol·mol^(-1)三个加标浓度下,加标回收率在78.8~106%之间。此外,采用液相色谱法和气相色谱质谱法测定济南的三个不同功能区(背景区、城市、郊区)的样品,两种测定方法比较的结果说明13种醛酮类化合物具有较好的一致性,从而证明了气相色谱质谱法测定13种醛酮类化合物的可行性。本方法无需添加任何有毒有害化学试剂,操作简单,灵敏度高,稳定性好,效率高。不仅很好地解决了丙烯醛和丙酮的基线分离问题,而且还能准确地定量测定空气中13种醛酮类化合物。展开更多
The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst,...The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.展开更多
文摘The acetalization and ketalization of various aldehydes and ketones with alcohols by using dealuminated USY(ultrastable Y-type zeolite) as catalyst were studied. The influences of silica/alumina ratio in the catalyst, catalyst amount and reaction time on the reaction were investigated. It is showed that the dealuminated USY is a high active catalyst for acetalization and ketaliz ation and its high activity can be readily returned to original by heating at 500 ℃ for 5 hours.
