不同浓度纳米二氧化钛对大型溞的繁殖及富集和自净能力的影响

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Abstract

We conducted a 21-day chronic test with six concentration in order to study the effects of different concentrations of TiO₂ nanoparticle on the growth and reproduction of Daphnia magna. The results showed that at the concentration of TiO₂ < 1 mg·L^-1, adverse effects on the growth and reproduction of Daphnia magna were not significant. At the concentration of TiO₂ >1 mg·L^-1, adverse effects were significant. As the concentration increased, the survival and reproduction were inhibited obviously. The days to first pregnancy, the days to first breeding, the number of broods per female, number of first broods per female, and the number of offsprings per female were all reduced significantly(p<0.05). At concentration of 5 mg·L^-1, breeding was basically stopped, and the intrinsic rate of natural increase (r_m) was dropped from 0.347 to 0.106 (control). The 21 d LC₅₀ was 4.16 mg·L^-1. The 24 h bioaccumulation experiment indicated that the greater the concentration and time, the higher the body burden. At both low concentration (2 mg·L^-1) and high concentration (10 mg·L^-1), the burden reached the maximum at 24 h. The 72 h depuration test suggested that the depuration was affected by the concentrations of accumulation. At low concentration (2 mg·L^-1), the depuration was stronger than at high concentration (10 mg·L^-1), and the biological halftime(T_1/2) was 63.3 h and 181.9 h, respectively.

Key words： nano-sized nTiO2 Daphnia magna reproduction bioaccumulation depuration

Received: 25 December 2012

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	Articles by authors
	FU Bao-rong
	ZHANG Nan
	WU Jian
	LI Nan
	ZHANG Run-jie
	HUI Xiu-juan

Cite this article:

FU Bao-rong,ZHANG Nan,WU Jian, et al. Effects of different concentrations of TiO2 nanoparticle on the reproduction, and bioaccumulation and depuration of Daphnia magna[J]. , 2012, 31(6): 601-605.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2012/V31/I6/601

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