分析了中国西南地区的岩水库中N-尼托胺的存在情况和来源
Xiaoyu Yan1, Bingquan Zhu1, Huanfang Huang2
1Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China.
Environmental geochemistry and health
|March 13, 2024
概括
在岩水库和自来水中,N-尼托胺广泛存在,具有致癌风险. 溶解有机物质的特性显示农业污染和微生物活动是主要来源,影响饮用水安全.
科学领域:
- 环境化学环境化学
- 分析水质 分析水质
- 公共卫生 公共卫生
背景情况:
- 酸胺是水源中发现的致癌污染物.
- 重要饮用水源的岩水库容易受到由于溶解有机物 (DOM) 的污染.
- 岩水库中N-胺和DOM的传播和来源尚不清楚.
研究的目的:
- 量化调查岩水库和自来水中的N-氨酸的存在和来源.
- 分析N-胺和溶解有机物质特性之间的关系.
- 评估与饮用水中的N-尼托胺相关的致癌风险.
主要方法:
- 在水库和自来水样本中对N-氨酸的定量分析.
- 三维光激发发射矩阵 (3D-EEM) 建模以描述DOM.
- 主要成分分析 (PCA) 和多重线性回归 (MLR) 用于识别N-尼托胺来源.
主要成果:
- 在超过85%的样本中检测到N-胺,其度超过安全限值.
- 在水库 (外源/藻类) 和自来水 (微生物) 之间,DOM的成分各不相同.
- 农业污染 (46.8%) 和微生物来源 (36.1%) 被确定为水库中N-尼托拉胺的主要贡献者.
结论:
- 在岩水库系统和它们处理的自来水中,N-尼托胺很普遍.
- DOM属性是理解N-尼托胺形成和来源的关键指标.
- 结果为确保饮用水安全提供了至关重要的数据,以确保饮用水安全,以防N-尼托胺污染.
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2° Amines to N-Nitrosamines: Reaction with NaNO2
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Inorganic Nitrogen Assimilation
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...


