顶空被动加标系统的多介质动力学模型

莫俊超; 姚洪伟; 吴孝槐; 郭丹丹; 赵方舟; 舒耀皋

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (11) : 5353-5360.

环境生态

顶空被动加标系统的多介质动力学模型

莫俊超^1,2, 姚洪伟^1,2, 吴孝槐³, 郭丹丹^1,2, 赵方舟^1,2, 舒耀皋^1,2

作者信息 +

Multimedia dynamic model for headspace passive dosing system

MO Jun-chao^1,2, YAO Hong-wei^1,2, WU Xiao-huai³, GUO Dan-dan^1,2, ZHAO Fang-zhou^1,2, SHU Yao-gao^1,2

Author information +

文章历史 +

摘要

使用多介质模型建模方法，构建了针对疏水性液体物质的顶空被动加标系统的动力学模型，以浮萍生长抑制试验系统和鱼类胚胎毒性试验系统为例，得出了3种不同性质的疏水性液体物质正壬烷、十甲基环五硅氧烷（D5）和邻苯二甲酸（2-乙基己基）酯（DEHP）在顶空被动加标系统中的浓度变化，并使用实测浓度对模型进行验证.结果表明，正壬烷和D5在两类系统中平衡24h后，水中浓度便已达到完全平衡时浓度的80%以上，而DEHP的平衡时间很长，不适合使用顶空被动加标系统开展试验，原因是DEHP的挥发性极低.实测浓度和模型预测结果偏差较小.敏感性分析表明，试验系统参数中容器直径对待测物质在水中浓度影响较大，因此可通过调整容器直径来缩短平衡时间，或提高平衡后化学物质在水中的浓度.使用所构建的模型可确定试验系统平衡时间、水中待测物质浓度和待测物质添加体积是否满足试验需求，并可通过敏感性分析来优化试验系统参数，提升试验效率和质量.以上结果完善了顶空被动加标系统应用的理论基础.

Abstract

A dynamic model for headspace passive dosing system (HPDS) on hydrophobic liquid substances was constructed using multimedia modeling method. Taking the lemna growth inhibition testing system and the fish embryo toxicity testing system as examples, the concentration changes of three hydrophobic liquid substances n-nonane, decamethylcyclopentasiloxane (D5) and di (2-ethylhexyl) phthalate (DEHP) with different properties in the HPDS were obtained. The model was verified by the measured concentrations. The results revealed that after 24h equilibrium of n-nonane and D5 in two systems, the aqueous concentrations reached more than 80% of the concentrations at complete equilibrium. However, considering the long equilibrium time of DEHP, HPDS was not applicable for performing tests because of the extremely low volatility of DEHP. The deviations between the measured concentrations and the results predicted by the model were small. Sensitivity analysis indicated that the diameter of the container in the testing system parameters had a great impact on the aqueous concentration of test substance. Therefore, it is feasible to adjust the diameter of the container for shortening equilibrium time, or increasing the aqueous concentrations of the chemicals after the equilibrium. The model established in this paper can be used to determine whether the equilibrium time of the testing system, the aqueous concentrations of the test substance and the added volume of the test substance can meet the testing requirements. In addition, the parameters of the testing system can be optimized through sensitivity analysis, thereby enhancing the testing efficiency and quality. The above results are expected to strengthen the theoretical basis for the application of HPDS.

导出引用

莫俊超, 姚洪伟, 吴孝槐, 郭丹丹, 赵方舟, 舒耀皋. 顶空被动加标系统的多介质动力学模型[J]. 中国环境科学. 2021, 41(11): 5353-5360

MO Jun-chao, YAO Hong-wei, WU Xiao-huai, GUO Dan-dan, ZHAO Fang-zhou, SHU Yao-gao. Multimedia dynamic model for headspace passive dosing system[J]. China Environmental Science. 2021, 41(11): 5353-5360

中图分类号： X502 X592

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