Dissolved organic matter (DOM) was isolated from the hypersaline Da Qaidam Lake using solid-phase extraction (SPE) methods with five different adsorbents: ENVI-Carb (non-porous graphitized carbon), HLB, PPL, and XAD-8 (polymer based), and ENVI-18 (silica based). Structure-selective assessments of SPE-DOM isolated using the different adsorbents were conducted using a combination of complementary analysis techniques, including dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) analysis, as well as elemental analysis, Fourier transformed infrared spectroscopy (FTIR), ¹H nuclear magnetic resonance (¹H NMR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS). The results indicated that the modified polymer based adsorbents (PPL and HLB) exhibited higher DOC recoveries than the others. The PPL and ENVI-Carb cartridges can recover representative nitrogen-containing organic components from the hypersaline lake. The SPE-DOM isolates obtained using ENVI-18 and XAD-8 adsorbents contained higher proportions of purely aliphatic, alkene, and aromatic compounds; the ENVI-Carb and PPL adsorbents showed higher affinity for polar functionalized aliphatic and nitrogen-containing compounds; HLB isolate was enriched with oxygen-rich organic compounds and sulphur-bearing components. The structural and compositional features of SPE-DOM from the hypersaline Da Qaidam Lake indicated the predominately autochthonous sources of organic matter in the lake.

中文翻译：

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高盐度大柴达木湖固相萃取对溶解有机物的选择性

使用固相萃取（SPE）方法使用五种不同的吸附剂从高盐大柴达木湖中分离出溶解的有机物（DOM）：五种不同的吸附剂：ENVI-Carb（无孔石墨化碳），HLB，PPL和XAD-8（基于聚合物） ）和ENVI-18（基于二氧化硅）。使用互补分析技术（包括溶解有机碳（DOC）和溶解有机氮（DON）分析以及元素分析，傅立叶变换红外光谱（ FTIR），¹ H核磁共振（¹1 H NMR）和热解-气相色谱-质谱（Py-GC / MS）。结果表明，改性聚合物基吸附剂（PPL和HLB）比其他吸附剂具有更高的DOC回收率。PPL和ENVI-Carb滤芯可从高盐湖中回收代表性的含氮有机成分。使用ENVI-18和XAD-8吸附剂获得的SPE-DOM分离物包含更高比例的纯脂族，烯烃和芳族化合物；ENVI-Carb和PPL吸附剂对极性官能化的脂肪族和含氮化合物表现出更高的亲和力；HLB分离物富含富氧有机化合物和含硫组分。高盐大柴达木湖中SPE-DOM的结构和成分特征表明该湖中有机质主要是自生源。