Numerical simulation of seasonality in the distribution and fate of pyrene in multimedia aquatic environments with Markov chains.
Numerical simulation of seasonality in the distribution and fate of pyrene in multimedia aquatic environments with Markov chains.
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利用马尔可夫链数值模拟多媒体水生环境中芘分布和归宿的季节性
DOI：
10.1038/s41598-017-10569-7
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发表时间：
2017-08-29
影响因子：
4.6
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Sun C;Xu L;Sun D;Chen L;Zou J;Zhang Z
本案例研究基于实验室实验和模型研究了有机污染物在水环境中的分布和归趋。芘（Pyr）是一种对水生生态系统和人类健康具有不利影响的碳氢化合物污染物，因此被选择用于本案例研究。Pyr在沉积物中的迁移主要受沉积物对Pyr的吸附作用和沉积物对Pyr的解吸作用的影响。它的消除主要是通过沉积物中微生物的生物降解和从水中挥发到空气中。Pyr的迁移和消除速率受温度和湿度的影响很大。马尔可夫链建模的结果表明，消除Pyr从水/沉积物系统是最迅速的潮湿条件下。在平均条件下，Pyr浓度为100 μg/L时，在250 h内可降至可忽略的水平。在潮湿条件下，这种下降发生在120小时以上。最后，在干燥条件下，需要550小时才能达到相同的消除程度。
This case study investigated the distribution and fate of organic pollutants in aquatic environments based on laboratory experiments and modeling. Pyrene (Pyr) is a hydrocarbon pollutant with adverse effects on aquatic ecosystems and human health, and was thus selected for this case study. The movement of Pyr was primarily influenced by its sorption from water onto sediment, and its desorption from sediment into water. Its elimination was mainly via biodegradation by microorganisms in sediment and by volatilization from water into air. The transport and elimination rates for Pyr were considerably influenced by temperature and moisture. Results of modeling with Markov chains revealed that the elimination of Pyr from water/sediment systems was the most rapid under wet conditions. Under average conditions, a Pyr concentration of 100 μg/L of in water in such a system declined to a negligible level over 250 h. Under wet conditions, this decrease occurred over 120 h. Finally, under dry conditions, it took 550 h to achieve the same degree of elimination.
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