کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7609427 1493397 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preconcentration and partial separation of nitroaromatic vapors using a methyltrimethoxysilane-based sol-gel
ترجمه فارسی عنوان
قبل از کنسانتره و جداسازی جزئی بخارات نیتروارامات با استفاده از سل ژل مبتنی بر متیل ترمیتوکسیسیلان
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Typical trace vapor analysis involves sorbent trapping, followed by desorption and chromatographic separation. This communication describes a method for streamlining this process by combining sorbent sampling/preconcentration with partial separation achieved through temperature-programmed thermal desorption. A novel sorbent trap was formulated in which tubular glass liners for a programmable-temperature gas chromatograph inlet were coated with a sol-gel based polymer stationary phase synthesized from methyltrimethoxysilane precursor and installed into the inlet, which was directly connected to a mass-selective detector by a fused silica capillary transfer line. This method is shown to achieve partial separation of two nitroaromatic vapors in a total 3-5 min analysis time, which represents a tenfold improvement in speed in terms of the overall cycle time compared to an analogous conventional vapor analysis method. Both analytes proved to have a high dynamic range and loading capacity, with nitrobenzene achieving both high and low sampling extremes (0.32 ng-4 μg sampling concentration) with only a slight compromise in peak broadening. The multivariate curve resolution by alternating least squares algorithm (MCR-ALS) was shown to successfully resolve the overlapped elution profiles of the two nitroaromatic test vapors examined in this study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1529, 22 December 2017, Pages 107-112
نویسندگان
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