论文部分内容阅读
在用选择离子流动管质谱(SIFT-MS)分析常用指甲油清洗垫发现大量4-丁酸内脂(γ-butyrolactone,GBL)和2-丁氧基乙醇(2-butoxy-1-ethanol)等挥发性气体后,运用选择离子流动管(SIFT)对H3O+,NO+和O2+.离子同九种烷氧基醇化合物(R1—O—R2OH)之间的反应进行了研究。获得了这些反应在潮湿空气条件下进行的情况,并运用产物离子水合物的种类和分布来确认产物离子的结构和反应机理。还研究了在不同载气压力下进行的反应。结果表明,这些化合物同H3O+和NO+的反应都是先生成初生态离子-分子络合物,(H3O+.M)*和(NO+.M)*,然后经不同反应渠道生成各种离子产物。这些初生态络合物同反应体系中存在的气体分子(如氦气,氮气和氧气分子)的碰撞对最终离子产物的形成和分布也有影响。这些化合物同O2+.反应会生成各种离解碎片离子,但不能确定这些离子是否经由初生态络合物(O2+..M)*生成。该项研究提供了用SIFT-MS在空气和潮湿气体中分析这些化合物所需的反应速率常数和离子产物等动力学数据,并将进一步应用到药物成瘾及滥用和呼吸道疾病的诊断和分析等领域。
A large number of γ-butyrolactone (GBL) and 2-butoxy-1-ethanol (4-BA) were found in common nail polish washing pads by SIFT-MS Volatile gases, the reaction between H3O +, NO + and O2 +. Ions with nine alkoxy alcohol compounds (R1-O-R2OH) was investigated using a selective ion mobility tube (SIFT). The reaction was carried out under humid air conditions and the type and distribution of the product ion hydrates were used to confirm the structure and reaction mechanism of the product ions. The reactions carried out under different carrier gas pressures were also investigated. The results showed that the reaction of these compounds with H3O + and NO + are the first generation of ion-molecule complexes, (H3O + .M) * and (NO + .M) *, and then generate various ion products through different reaction channels. The collisions of these nascent complexes with the gas molecules present in the reaction system, such as helium, nitrogen, and oxygen molecules, also have an effect on the formation and distribution of the final ion product. These compounds react with O2 + to generate various dissociated fragment ions, but it is not certain whether these ions are formed via the nascent complex (O2 + .. M) *. This study provides kinetic data on the reaction rate constants and ion products required for the SIFT-MS analysis of these compounds in air and humid gases and is further used in the diagnosis and analysis of drug addiction and abuse and respiratory diseases field.