海水养殖底泥中外源汞甲基化及生物响应研究

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Abstract By simulation of mariculture environment and Nereis diversicolor as benthic, the methylation of Mercury (Hg), accumulation of methylmercury (MeHg) and the oxidative stress of Nereis diversicolor were studied under the existence of Hg(NO₃)₂. The results showed that mercury could be transformed to methylmercury by both Nereis diversicolor and the environment, especially in that with Nereis diversicolor. The concentration of MeHg in the sediments with Nereis diversicolor was 1.93 times that without Nereis diversicolor. With increasing of the external input mercury concentration and exposure time, the concentration of MeHg increased and the accumulation rate decreases gradually in benthic body. The concentration of methylmercury in Nereis diversicolor body was 0.007~0.079mg/kg that was 31.20%~86.90% of Total mercury. The activity of SOD and CAT, the concentration of GSH and MDA in the Nereis diversicolor were significantly correlated with exposed time and Hg concentration. Compared with inorganic Hg, Methylmercury could cause more oxidative stress and had stronger biotoxicity. The defense limit of the oxidative stress system of the silkworm would be broken, when the concentration of external input mercury exceeds 0.5mg/kg in the sediment.

Key words： exogenous mercury methylation sediment nereis diversicolor oxidative stress

Received: 02 November 2020

PACS:	X503.23
	X55

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	Articles by authors
	WANG Shu-ping
	SONG Yu-mei
	LIU Shuang
	GUO Peng-ran

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WANG Shu-ping,SONG Yu-mei,LIU Shuang等. Research of the methylation and biological response of exogenous mercury in mariculture sediments[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2871-2880.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2871

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