顶空被动加标系统的多介质动力学模型

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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.

Key words： headspace passive dosing hydrophobic substance dynamic multimedia model sensitivity

Received: 31 March 2021

PACS:	X502
	X592

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	Articles by authors
	MO Jun-chao
	YAO Hong-wei
	WU Xiao-huai
	GUO Dan-dan
	ZHAO Fang-zhou
	SHU Yao-gao

Cite this article:

MO Jun-chao,YAO Hong-wei,WU Xiao-huai等. Multimedia dynamic model for headspace passive dosing system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5353-5360.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5353

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