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首页> 外文期刊>Carbonates And Evaporites >Solute distribution in the Ogallala Aquifer, Texas: lithium, fluoride, nitrate, chloride and bromide
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Solute distribution in the Ogallala Aquifer, Texas: lithium, fluoride, nitrate, chloride and bromide

机译：德克萨斯州奥加拉拉含水层中的溶质分布：锂，氟化物，硝酸盐，氯化物和溴化物

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摘要

Spatial patterns of lithium, fluoride, nitrate, chloride and bromide in the Ogallala Aquifer of northwestern Texas were mapped and evaluated. Solute concentrations and depths were compiled for 705 water wells sampled between 2008 and 2014. Lithium concentrations were high relative to typical groundwater; median and maximum concentrations were 66.8 and 2,790 ug/L, respectively. Almost half of the fluoride observations equaled or exceeded the secondary maximum contaminant level (MCL) of 2 mg/L. Many nitrate observations exceeded the MCL of 44.3 mg/L, and several chloride observations exceeded the secondary MCL of 250 mg/L, with a maximum concentration nearly ten times that level. Most bromide observations were less than 0.15 mg/L; however, some observations exceeded 10 mg/L. Several wells had high chloride/bromide ratios and high chloride concentrations. Generally, concentrations of all solutes were higher in the southern part of the aquifer, where wells are relatively shallow. Solute concentrations documented in this study are likely influenced by water-rock interaction within the aquifer, as well as mixing with groundwater in underlying bedrock containing evaporite minerals. Agricultural practices and possibly oilfield activity also affect water quality in the Ogallala Aquifer.
机译：绘制并评估了德克萨斯州西北部奥加拉拉含水层中锂，氟，硝酸盐，氯化物和溴化物的空间格局。编制了2008年至2014年之间采样的705口水井的溶质浓度和深度的资料。中位数和最大浓度分别为66.8和2790 ug / L。几乎一半的氟化物观测值等于或超过2 mg / L的次要最大污染物水平（MCL）。许多硝酸盐观测值超过了44.3 mg / L的MCL，一些氯化物观测值超过了250 mg / L的次级MCL，最大浓度接近该水平的十倍。大多数溴化物观测值均低于0.15 mg / L;但是，一些观察结果超过了10 mg / L。几口井的氯化物/溴化物比率高且氯化物浓度高。通常，在井相对较浅的含水层南部，所有溶质的浓度都较高。这项研究中记录的溶质浓度可能受含水层内水-岩相互作用以及与地下水中含蒸发性矿物的基岩中地下水混合的影响。农业实践以及可能的油田活动也会影响Ogallala含水层的水质。

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