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首页> 外文期刊>The Science of the Total Environment >Determination of monochloramine dissipation kinetics in various surface water qualities under relevant environmental conditions - Consequences regarding environmental risk assessment
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Determination of monochloramine dissipation kinetics in various surface water qualities under relevant environmental conditions - Consequences regarding environmental risk assessment

机译：相关环境条件下各种地表水质中单氯胺耗散动力学的测定 - 环境风险评估的后果

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A total 190 experiments were performed to study the dissipation kinetics of monochloramine (NH2Cl, CAS no 10599-90-3) in surface water samples from six rivers (Loire, Rhone, Meuse, Garonne, Seine and Moselle) and an artificial reservoir (Mirgenbach), all located in France. Experiments were conducted in an open reactor, under relevant controlled environmental conditions. The impact of various parameters such as initial NH2Cl concentration, temperature, pH, presence of sediments, sampling site and collection period was investigated. It was found that NH2Cl dissipated rapidly without any lag phase, and that decay follows an apparent first-order kinetics (r(2) 0.99). Presence of sediment greatly accelerated decay. Half-lives were generally 1 h in river water in presence of natural sediment, but of several hours without sediment. The impact of pH was low for the normal river water pH range. However, increase in temperature significantly accelerated decay. The combination of high initial NH2Cl concentrations and elevated temperatures generally gives half-lives similar to those obtained at lower temperatures and lower concentrations. Short half-lives (0.06 to 1.50 h) were found in all the surface waters examined, regardless of geographic location of sampling site or collection period, indicating no temporal or site-specific effects on NH2Cl dissipation. Decay was slightly faster at lower initial concentrations, which supports extrapolation of half-lives measured in this study to a wide range of environmental concentrations. It can thus be assumed that NH2Cl degradation in river and reservoir waters is mainly determined by presence of sediments and temperature. (C) 2019 Elsevier B.V. All rights reserved.
机译：进行了190个实验，研究了六条河流（Loire，Rhone，Meuse，Garonne，Seine和Moselle）和人造水库（Mirgenbach ），所有位于法国。在相关的受控环境条件下在开放式反应器中进行实验。研究了各种参数，例如初始NH 2Cl浓度，温度，pH，沉积物，采样部位和收集期的影响。发现NH2CL快速消散而没有任何滞后阶段，并且衰减遵循表观一阶动力学（R（2）> 0.99）。沉积物的存在极大地加速了腐烂。在天然沉积物存在下，半衰期通常是河水中的1小时，但在没有沉积物的情况下几个小时。对于普通河水pH范围，pH的影响较低。但是，衰减显着加速的温度增加。高初始NH 2Cl浓度和升高的温度的组合通常给半衰期与在较低温度和较低浓度下获得的半衰期。在检查的所有表面水域中发现了短半衰期（0.06至1.50小时），无论采样部位或收集期的地理位置如何，表明没有对NH2CL耗散的时间或特异性特异性效果。在较低的初始浓度下衰减略微更快，这支持在本研究中测量的半衰期外推到广泛的环境浓度。因此，可以假设河流和储层水中的NH2CL降解主要由沉积物和温度的存在决定。 （c）2019 Elsevier B.v.保留所有权利。

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