Increasing evidence has emerged that Mn derived from drinking water could be a health risk, especially for children. This study aimed to provide more information on the variation in Mn concentrations in well water and factors that affect manganese concentrations in groundwater in the natural environment. The geochemical data consisted of analyses of single water samples (n = 5311) that were taken only once and data from monitoring sites where water samples (n = 4607) were repeatedly taken and analyzed annually from the same wells. In addition, the well-specific results from six wells at monitoring sites were described in detail. We obtained the data on water samples from the groundwater database of Geological Survey of Finland. In single samples, Mn concentrations varied from < 0.02 µg/l to 5800 µg/l in bedrock well waters and up to 6560 µg/l in Quaternary deposit well waters. Results from single water samples from bedrock wells and Quaternary deposit wells indicated that the dissolved oxygen content has an inverse association with the Mn concentration. When the dissolved oxygen O₂ levels were lower, the Mn concentrations were higher. No clear association was found between the Mn concentration and the pH or depth of the well for single samples. Part of Mn was particle bound, because total Mn was higher than soluble Mn in most measured samples. In the monitoring survey, large variation in Mn concentrations was found in bedrock well water in Kemijärvi, 114–352 µg/l, and in dug well water in Hämeenkoski, 8.77–2640 µg/l. Seasonal and spatial variability in Mn concentrations in water samples from two bedrock wells was large at monitoring sites in northern Finland. Variability in the Mn concentrations in groundwater can be large, even in the same area. These data suggest that single measurements of the Mn concentration from a water source may not reveal the Mn status, and measurement of both the total and soluble Mn concentrations may be recommended.

越来越多的证据表明，饮用水中的锰会危害健康，特别是对儿童而言。这项研究旨在提供有关井水中锰浓度变化以及在自然环境中影响地下水中锰浓度的因素的更多信息。地球化学数据包括 仅采集一次的单个水样（n = 5311）的分析和来自水样（n = 4607），每年从同一口井中重复采集并进行分析。此外，还详细介绍了在监控站点的六口井的特定井结果。我们从芬兰地质调查局的地下水数据库中获得了有关水样的数据。在单个样品中，基岩井水中的锰浓度范围从<0.02 µg / l到5800 µg / l，在第四纪沉积井水中的锰含量高达6560 µg / l。基岩井和第四纪沉积井的单个水样的结果表明，溶解氧含量与Mn浓度成反比。当溶解氧为O _2时含量较低，锰浓度较高。对于单个样品，未发现锰浓度与孔的pH或深度之间有明确的关联。部分Mn被颗粒束缚，因为在大多数测量样品中，总Mn均高于可溶性Mn。在监测调查中，发现在Kemijärvi的基岩井水中锰含量变化很大，为114–352 µg / l，在Hämeenkoski的挖井水中，锰含量为8.77–2640 µg / l。在芬兰北部的监测点，来自两个基岩井的水样中锰浓度的季节性和空间变异性很大。即使在同一地区，地下水中Mn浓度的变化也可能很大。这些数据表明，单次测量水源中的Mn浓度可能无法揭示Mn的状态，