新西兰地下水中酸盐-的参考条件和值
Christopher J Daughney1, Uwe Morgenstern2, Magali Moreau3
1National Institute of Water and Atmospheric Research, Wellington, New Zealand.
Journal of the Royal Society of New Zealand
|December 9, 2024
概括
本研究确定了新西兰地下水中酸盐- (NO3-N) 的参考条件. 这些发现为评估全国地下水质量和人类影响提供了必要的基准.
科学领域:
- 环境科学 环境科学
- 水文地质学 水文地质学
- 水质管理水质管理
背景情况:
- 了解地下水质量依赖于参考条件,代表没有人类影响的自然度.
- 酸- (NO3-N) 是一个关键的水质指标,经常受到人类活动的影响.
- 建立可靠的参考条件对于有效的地下水管理和监管框架至关重要.
研究的目的:
- 评估和定义新西兰地下水中NO3-N的参考条件.
- 为了比较不同的方法来估计这些自然度范围.
- 建议在地下水管理中为NO3-N提出一个国家级的默认值.
主要方法:
- 利用等级集群分析,根据化学相似性将地下水样本分组.
- 分析了NO3-N度和地下水年龄之间的关系,以推断自然水平.
- 使用回归分析与土地利用影响指标进行对比,以区分人为影响.
主要成果:
- 通过三种互补的方法,在氧化地下水中的NO3-N得到了全国范围内一致的参考条件.
- 氧化地下水的关键百分点 (第 80, 90, 95) 估计分别为1.65±0.12,1.97±0.14,2.32±0.14毫克/升.
- 无氧地下水的参考条件有显著差异,第80和第90百分点为0.04±0.01和0.16±0.01 mg/L.
结论:
- 建议NO3-N度的第80百分位为氧化和无氧地下水的适当的国家级默认值.
- 这个默认值与现有的地表水质水质指南保持一致.
- 该研究为新西兰的地下水质量监测和管理策略提供了有价值的数据.
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