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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：在相关环境条件下测定各种地表水水质中单氯胺耗散动力学-有关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：总共进行了190个实验，研究了六条河流（卢瓦尔河，罗纳河，默兹河，加龙河，塞纳河和摩泽尔河）和人工水库（米尔根巴赫）的地表水样品中一氯胺（NH2Cl，CAS编号10599-90-3）的耗散动力学。 ），均位于法国。在相关受控环境条件下在开放式反应器中进行实验。研究了各种参数的影响，例如初始NH2Cl浓度，温度，pH，沉积物的存在，采样地点和收集时间。发现NH2Cl迅速消散而没有任何滞后相，并且衰减遵循明显的一阶动力学（r（2）> 0.99）。沉积物的存在大大加速了衰变。在自然沉积物存在的情况下，河水中的半衰期通常小于1小时，但无沉积物的半衰期为数小时。在正常河水pH范围内，pH的影响很小。然而，温度升高明显加速了衰变。较高的初始NH2Cl浓度和升高的温度相结合，通常产生的半衰期类似于在较低温度和较低浓度下获得的半衰期。在所有被检查的地表水中都发现了较短的半衰期（0.06至1.50小时），而与采样地点或采集期的地理位置无关，这表明对NH2Cl的消散没有任何暂时或特定的影响。在较低的初始浓度下，衰变会稍快一些，这支持将本研究中测得的半衰期推算为各种环境浓度。因此可以假定，河流和水库水中的NH2Cl降解主要取决于沉积物的存在和温度。 （C）2019 Elsevier B.V.保留所有权利。

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