Groundwater represents a vast and highly important source of drinking water. As a part of the hydrological cycle, it can only be managed by understanding the components that make up its vulnerability profile. These are referenced with anthropogenic influences related to pressures connected with land use and the ever-increasing conversion of land surface for urban use. The quality of groundwater can be assessed and expressed using a number of different chemical parameters. In this paper, we focus on the analysis of groundwater’s physico-chemical field parameters and the major ions present in Slovenian aquifers. Several statistical methods were applied to outline the relevant criteria involved in determining the groundwater’s natural background. Additionally, a graphical method was applied to evaluate the source of major ions distribution in the groundwater. The most common BRIDGE methodology used to determine background values is based on upper percentile values. It turns out that this methodology might be relevant for chemical parameters mainly affected by geogenic sources, while the “anthropogenic” parameters have to be treated with a different approach e.g., probability plot method.

中文翻译：

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斯洛文尼亚主要岩性单元内地下水的水文地球化学特征和自然本底水平的测定

地下水代表着巨大的饮用水源。作为水文循环的一部分，只能通过了解构成其脆弱性概况的组件来进行管理。这些被认为是人为的影响，与土地使用相关的压力以及用于城市用途的土地表面转换的不断增加有关。可以使用许多不同的化学参数来评估和表达地下水的质量。在本文中，我们重点分析斯洛文尼亚含水层中地下水的理化场参数和主要离子。应用了几种统计方法来概述确定地下水自然本底所涉及的相关标准。另外，应用图形方法评估地下水中主要离子的分布来源。用于确定背景值的最常见的BRIDGE方法是基于较高的百分位值。事实证明，这种方法可能与主要受地源影响的化学参数有关，而“人为”参数则必须采用不同的方法（例如概率图法）进行处理。