Institute of Analytical Chemistry, Johannes-Kepler-University, Linz, Austria.
Anal Bioanal Chem. 2011 Jun;400(8):2317-22. doi: 10.1007/s00216-010-3989-9. Epub 2010 Jul 17.
A fast and simple method for the direct qualitative and semi-quantitative determination of a set of four polymer additives in plastic samples by desorption electrospray ionization time-of-flight mass spectrometry (DESI-TOF-MS) is presented. After evaluation of crucial DESI parameters such as composition of spray solutions and spray voltages, a series of lab-made polypropylene samples containing Chimassorb 81 (2-hydroxy-4-n-octoxybenzophenone), Tinuvin 328 (2-(2-hydroxy-3, 5-ditert-pentylphenyl)-benzotriazole), Tinuvin 326 (2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chloro benzotriazole), and Tinuvin 770 (bis(2,2,6,6,-tetramethyl-4-piperidyl)sebaceate) in concentrations between 0.02% and 0.2% were analyzed, resulting in calibration graphs with R (2) better than 0.994. To demonstrate the applicability of the developed method for the investigation of real samples, liners for in-ground swimming pools and polypropylene granules were analyzed with respect to their content in the selected polymer additives. Two alternative methods, both well established in the fields of polymer additive analysis, namely HPLC with UV detection (after previous extraction) and thermodesorption gas chromatography/mass spectrometry have been employed for evaluation of the results from the DESI experiments.
本文提出了一种快速、简单的方法，通过解吸电喷雾电离飞行时间质谱（DESI-TOF-MS）直接定性和半定量测定塑料样品中一组四种聚合物添加剂。在评估了喷雾溶液组成和喷雾电压等关键 DESI 参数后，对一系列实验室自制的聚丙烯样品进行了分析，这些样品中含有 Chimassorb 81（2-羟基-4-正辛氧基二苯甲酮）、Tinuvin 328（2-（2-羟基-3,5-二特戊基苯基）-苯并三唑）、Tinuvin 326（2-（2-羟基-3-叔丁基-5-甲基苯基）-5-氯苯并三唑）和 Tinuvin 770（双（2,2,6,6-四甲基-4-哌啶基）癸二酸酯），浓度在 0.02%至 0.2%之间，得到了 R（2）优于 0.994 的校准曲线。为了证明所开发方法在实际样品研究中的适用性，对地下游泳池的衬里和聚丙烯颗粒进行了分析，以确定它们在选定聚合物添加剂中的含量。两种替代方法，即高效液相色谱法与紫外检测（萃取前）和热解吸气相色谱/质谱法，都已被用于评估 DESI 实验结果。
