固相萃取-高温裂解-气相色谱质谱法测定西台晶间卤水中溶解性有机质

Solid Phase Extraction-pyrolysis-gas Chromatography/mass Spectrometry-analysis Dissolved Organic Matter from Salt Lake Brine

采用3种固相萃取材料(C18、XAD-8/4和PPL)分离富集西台吉乃尔盐湖卤水中的溶解性有机物(DOM),通过总有机碳/总氮分析(TOC/TN)、紫外—可见光谱分析、元素分析、傅里叶变换红外光谱分析(FTIR)、高温裂解—气相色谱质谱联用仪(Py-GC/MS)等对富集的有机物进行表征和分析方法比较。结果表明,西台吉乃尔盐湖卤水中的溶解性有机物主要有多糖类,芳香类、含氮类有机物,烷烃烯烃类化合物。PPL,C18和XAD-8/4的回收率分别为40±2%,7±2%和16±1%,虽然C18和XAD-8/4回收率较低,但3种吸附剂都有各自的特点,C18较易吸附烷烃烯烃类有机物,XAD-8/4较易吸附芳香类有机物,PPL较易吸附含N类有机物和多糖类有机物。

Three solid-phase extraction（SPE） materials,including C18,XAD-8/4 and PPL were used in this study to isolate dissolved organic matter（DOM） from the West Taijnar Salt Lake brine. The isolated DOM was characterized and compared to total organic carbon and total nitrogen（TOC/TN） analyzer,UV-visible spectroscopy,elemental analyzer,Fourier transform infrared spectroscopy（FTIR） and pyrolysis-gas chromatography/mass spectrometry（Py-GC/MS）. The results indicated that the DOM in West Taijnar Salt Lake brine mainly included polysaccharides,aromatic compounds,N-containing compounds,alkanes and alkenes. The recovery efficiency of PPL was 40 ± 2%,while the recovery efficiency of C18 and XAD-8/4,7 ± 2% and 16 ± 1%,were relatively lower. The three sobents had their own advantages in isolating DOE. C18 readily adsorbed alkenes,while XAD-8/4 was good for isolating aromatic compounds,and PPL was considered to extract N-containing compounds and polysaccharides more easily.