| 挥发性环甲基硅氧烷的长距离迁移及总持久性模拟 |
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| 引用本文： | 赵梦可,胡建信.挥发性环甲基硅氧烷的长距离迁移及总持久性模拟[J].环境科学研究,2018,31(10):1705-1711. |
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| 作者姓名： | 赵梦可 胡建信 |
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| 作者单位： | 北京大学环境科学与工程学院, 北京 100871 |
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| 摘 要： | cVMS（挥发性环甲基硅氧烷）的环境和健康效应近年来受到广泛关注.运用TaPL3模型探究了D4（八甲基环四硅氧烷）、D5（十甲基环五硅氧烷）和D6（十二甲基环六硅氧烷）3种cVMS在哈尔滨市、天津市和广州市3个城市环境下的长距离迁移性和持久性，并分别用CTD（特征迁移距离）和Pov（总持久性）表征；同时，通过灵敏度分析筛选模型中的关键参数.结果表明:①D4~D6的CTDair（大气中CDT）范围为359~998 km，随cVMS分子量的增大而减小；Povwater（水体中Pov）范围为10~34 d，区域和物质差异均不大.CTDwater（水体中CDT）的范围为328~4 383 km且D4 < D5 < D6；Povwater（水体中Pov）的范围为276~44 802 d，随分子量增加而增大.②从区域来看，除CTDair表现为天津市>哈尔滨市>广州市外，其余各值均为哈尔滨市>天津市>广州市，体现出环境参数对于模拟结果具有一定的影响；而CTD与Pov之间并无直接关系.③对于排放到大气的cVMS而言，对CTDair影响最大的参数是空气中的半衰期和风速，对Povair影响最大的是空气中的半衰期；对于排放到水体的cVMS而言，对CTDwater影响最大的是lg KOW（辛醇-水分配系数的对数），而对Povwater（水体中Pov）影响最大的是环境温度.④对于同一物质在不同环境中的模拟，其结果可能存在一定差异，因此在进行决策时要考虑环境因素.研究显示，cVMS具有中等的长距离迁移潜力，其全球尺度环境风险值得引起关注.
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| 关 键 词： | 挥发性环甲基硅氧烷 TaPL3模型 长距离迁移 总持久性 |
| 收稿时间： | 2018/1/11 0:00:00 |
| 修稿时间： | 2018/5/12 0:00:00 |
Simulation of Long-Range Transport Potential and Overall Persistence of Cyclic Volatile Methylsiloxanes |
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| ZHAO Mengke and HU Jianxin.Simulation of Long-Range Transport Potential and Overall Persistence of Cyclic Volatile Methylsiloxanes[J].Research of Environmental Sciences,2018,31(10):1705-1711. |
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| Authors: | ZHAO Mengke and HU Jianxin |
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| Affiliation: | College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China |
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| Abstract: | Cyclic volatile methylsiloxanes (cVMS) are of concern due to their adverse effects on the environment and human health. Here, the researchers used the TaPL3 (the Transport and Persistence Level Ⅲ) model to evaluate the characteristic travel distance (CTD) and overall persistence (Pov) of three main cVMS, i.e, octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) in the air and water of three Chinese cities (Harbin, Tianjin and Guangzhou). The results were as follows:(1) In air, the estimated CTD (359-998 km) decreased with increasing molecular weight, whereas the estimated Pov (10-34 d) differed little between cities and substances. By contrast, in water, the estimated CTD (328-4, 383 km) increased with increasing molecular weight, whereas the estimated Pov (276-44, 802 d) increased with increasing molecular weight. (2) All CTD and Pov estimates, except for the CTD through air, were highest in the Harbin environment, followed by the Tianjin and Guangzhou environments. Furthermore, the CTD and Pov estimates were not related to each other. (3) The most influential parameters in air were identified as wind velocity for CTD and half-life in the air for both CTD and Pov and in water as logarithmic octanol-water partition coefficients and ambient temperatures for both indices. The results and the mechanisms of this modelling system were discussed carefully. (4) For the same chemical, estimates varied among different environments. The researchers suggested that attention must be paid to the situations of diverse environments while making scientific decisions. The study suggested that cVMS demonstrated an intermediate potential to long-range transport, which highlighted the need for further in-depth investigations in the future. |
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| Keywords: | cyclic volatile methylsiloxanes TaPL3 model long-range transport overall persistence |
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