对二甲苯降解产物对海洋双壳类的急性毒性

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Abstract To evaluate the application safety of microalgae for p-xylene (PX) biodegradation in seawater, the acute toxicity of three degradative intermediates of PX (p-toluic acid, p-tolyl alcohol and p-cresol) was testified to two species of marine bivalves (Ruditapes philippinarum and Meretrix meretrix), based on which the corresponding safety concentrations (SCs) were calculated. Referring to the revised Hazard Evaluation Procedure for Chemical Substances established by the Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP) in International Maritime Organization (IMO), p-toluic acid was "practically non-toxic" on both species with the 96h LC₅₀ values above 340mg/L, as well as p-tolyl alcohol with the 96h LC₅₀ values of 305.67, 560.34mg/L for both species, respectively. While p-cresol was slightly toxic and non-toxic to R. philippinarum (96h LC₅₀=77.95mg/L) and M. meretrix (96h LC₅₀=1271.74mg/L), respectively. It is supposed that a stronger accumulation of p-cresol in R. philippinarum would be related to the higher toxicity compared to M. meretrix. In general, these degradation products showed lower toxicities to bivalves compared with the parent compound, except for p-cresol with a slightly higher toxicity than PX. The application of microalgae for PX degradation is still safe for bivalves because the p-cresol only existed in a short period after PX biodegradation for 2~4 days. The SCs of p-tolyl alcohol and p-cresol to marine bivalves were 70.42, 12.10mg/L, respectively. However, it is not need to propose a limit value of SC for p-toluic acid because the zero mortality of two species occurred when exposed to this compound for 96h at a concentration equal to its solubility in seawater. Further study on the toxicity of these degradative intermediates to marine fishes and crustaceans is needed to obtain a comprehensive understanding of the marine biosafety of PX degradation by microalgae.

Key words： p-xylene (PX) degradation intermediates bivalves acute toxicity safety concentration (SC)

Received: 09 May 2020

PACS:	X171.5
	X55

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	Articles by authors
	LI Hai-ping
	MENG Fan-ping
	LI Da-wei
	PENG Li-hong
	ZHENG Yang
	LIN Yu-fei

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LI Hai-ping,MENG Fan-ping,LI Da-wei等. Study on the acute toxicity of degradation products by p-xylene to marine bivalves[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5436-5443.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5436

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