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Tracking variations in the abundance and composition of dissolved organic matter in solar ponds of oilfield-produced brine
Applied Geochemistry ( IF 3.4 ) Pub Date : 2021-06-01 , DOI: 10.1016/j.apgeochem.2021.105008
Keli Yang , Yaoling Zhang , Yaping Dong , Jiaoyu Peng , Joeri Kaal , Wu Li , Xiuzhen Ma , Zhen Nie

The quantity and quality of dissolved organic matter (DOM) in the brine of solar ponds influence the efficiency of mineral extraction and brine evaporation rates. Here we report a characterization study of DOM in solar ponds of oilfield-produced brines using different approaches. The results showed that the concentrations of dissolved organic carbon and total dissolved solids exhibited a 2–3 fold increase with exposure time in the ponds. Analyses with two-dimensional correlation spectroscopy of attenuated total reflectance Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, indicated that the aromatic and carboxylic acid structures in the DOM, were more susceptible to degradation/transformation compared with aliphatics, while aliphatics exhibited a preferential decline with increasing exposure time in the solar ponds. The relative abundance of aliphatic compounds (including functionalized ones) gradually decreased by 17.1% (r = −0.94, P < 0.001), in the solar pond process, while the opposite was observed for carbohydrates, which increased by 88.7% (r = 0.93, P < 0.001). Pyrolysis–gas chromatography–mass spectrometry revealed that the DOM in oilfield-produced brine contained polymethylene chain, terpenoid-like, carbohydrate (or carbohydrate-like) and aromatic structures. Terpenoid-like compounds were depleted while isoprenoid and linear polymethylene chain compounds increased upon irradiation in solar ponds. Finally, the guidelines for removing DOM from brine, and their ecological impacts and consequences in the process of brine resource exploitation, were discussed.



中文翻译:

跟踪油田生产卤水太阳池中溶解有机物丰度和组成的变化

太阳池卤水中溶解有机物 (DOM) 的数量和质量会影响矿物提取效率和卤水蒸发率。在这里,我们报告了使用不同方法对油田生产盐水的太阳池中的 DOM 进行的表征研究。结果表明,在池塘中,随着暴露时间的增加,溶解有机碳和总溶解固体的浓度增加了 2-3 倍。衰减全反射傅里叶变换红外光谱和质子核磁共振二维相关光谱分析表明,与脂肪族相比,DOM中的芳香族和羧酸结构更容易降解/转化,而脂肪族则表现出优先下降随着在太阳池中暴露时间的增加。r  = -0.94, P  < 0.001),在太阳池过程中,而碳水化合物则相反,增加了 88.7% ( r  = 0.93, P  < 0.001)。热解-气相色谱-质谱分析表明,油田生产盐水中的DOM含有多亚甲基链、类萜、碳水化合物(或类碳水化合物)和芳香结构。类萜化合物被耗尽,而类异戊二烯和线性多亚甲基链化合物在太阳池中辐照后增加。最后,讨论了从卤水中去除 DOM 的指南,以及它们在卤水资源开发过程中的生态影响和后果。

更新日期:2021-06-05
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