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首页> 外文期刊>Environmental Monitoring and Assessment >SPATIAL PATTERNS OF NITRATE, CHLORIDE, SULFATE, AND FLUORIDE CONCENTRATIONS IN THE WOODBINE AQUIFER OF NORTH-CENTRAL TEXAS
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SPATIAL PATTERNS OF NITRATE, CHLORIDE, SULFATE, AND FLUORIDE CONCENTRATIONS IN THE WOODBINE AQUIFER OF NORTH-CENTRAL TEXAS

机译：中北部得克萨斯州伍德宾含水层中硝酸盐，氯化物，硫酸盐和氟化物浓度的空间分布

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摘要

A geographic information system was used to map and analyze nitrate, chloride, sulfate, and fluoride concentrations in 110 wells tapping the Woodbine Aquifer. The study area, covering nine counties in north-central Texas, includes large percentages of both urban and agricultural land uses. Land use maps were compared with solute concentration data, and statistics were applied to detect associations between solutes, well depth, and land use. Anthropogenic sources such as fertilizer applications and natural sources such as gypsum, lignite, and clay deposits controlled nitrate, chloride, and sulfate concentrations, each inversely correlated with well depth. However, only one nitrate observation ― from a shallow well in the aquifer's outcrop zone ― surpassed the maximum contaminant level (MCL) of 44.3 mg L~(-1). By comparison, nearly half of the sulfate and several of the chloride observations surpassed the MCL of 250 mg L~(-1) for each of those ions. Volcanic ash deposits influenced fluoride concentrations, which directly correlated with well depth. There were no statistically significant associations between solute concentrations and land use. Low recharge rates and confining layers have mitigated anthropogenic impacts on solute levels in the aquifer.
机译：地理信息系统用于绘制和分析Woodbine含水层中110口井中的硝酸盐，氯化物，硫酸盐和氟化物浓度。研究区域覆盖得克萨斯州中北部的九个县，包括城市和农业用地的很大比例。将土地利用图与溶质浓度数据进行比较，并使用统计数据来检测溶质，井深和土地利用之间的关联。人为来源（例如施肥）和自然来源（例如石膏，褐煤和粘土沉积物）可控制硝酸盐，氯化物和硫酸盐的浓度，每种浓度与井深成反比。但是，只有一个硝酸盐观测值（在含水层露头区的浅井中）超过了最大污染物水平（MCL）44.3 mg L〜（-1）。相比之下，这些离子中的每一个离子的硫酸盐和氯化物的近一半都超过了250 mg L〜（-1）的MCL。火山灰沉积物影响氟化物浓度，这与井深直接相关。溶质浓度与土地利用之间没有统计学上的显着关联。低补给率和限制层减轻了人为因素对含水层中溶质水平的影响。

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