Dissolved organic matter (DOM) was isolated from the hypersaline Da Qaidam Lake by solid-phase extraction (SPE) methods with five different adsorbents: ENVI-Carb (non-porous graphitized carbon), as well as HLB, PPL, and XAD-8 (polymer based), and ENVI-18 (silica based). The structure-selective assessments of SPE-DOM isolated by different adsorbents were conducted by 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 recovery representative nitrogen-containing organic components from the hypersaline lake. The SPE-DOM isolates obtained by ENVI-18 and XAD-8 adsorbents contained higher proportions of purely aliphatics, alkene, and aromatics; the ENVI-Carb and PPL extracts showed higher affinity to polar functionalized aliphatics and nitrogen-containing compounds; HLB isolates enriched in oxygen-rich organic compounds and sulphur-bearing components. The structural and composition features of SPE-DOM for the hypersaline Da Qaidam Lake indicated the predominately autochthonous organic matter sources of 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

通过固相萃取（SPE）方法使用五种不同的吸附剂：ENVI-Carb（无孔石墨化碳）以及HLB，PPL和XAD-8从高盐大柴达木湖中分离出溶解有机物（DOM）。 （基于聚合物）和ENVI-18（基于二氧化硅）。通过互补分析技术的组合对不同吸附剂分离的SPE-DOM进行结构选择性评估，包括溶解有机碳（DOC）和溶解有机氮（DON）分析以及元素分析，傅里叶变换红外光谱（ FTIR），1H核磁共振（1H 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。通过ENVI-18和XAD-8吸附剂获得的SPE-DOM分离物含有较高比例的纯脂肪族，烯烃和芳族化合物；ENVI-Carb和PPL提取物对极性官能化的脂肪族化合物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。高盐大柴达木湖的SPE-DOM的结构和组成特征表明该湖主要是土体的有机物来源。ENVI-Carb和PPL提取物对极性官能化的脂肪族化合物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。高盐大柴达木湖的SPE-DOM的结构和组成特征表明该湖主要是土体的有机物来源。ENVI-Carb和PPL提取物对极性官能化的脂肪族化合物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。高盐大柴达木湖的SPE-DOM的结构和组成特征表明该湖主要是土体的有机物来源。