作 者：
钟建丹;陈红春;罗春燕;李科岑;向均钧;王莉淋;邓仕槐
关键词：
碳纳米材料;持久性有机污染物;植物毒性;抗氧化酶;生态风险
摘 要：
为探讨碳纳米材料与持久性有机污染物共存时的生态风险,通过水培的方式,研究了多壁碳纳米管或/和菲对水稻分别暴露及同时暴露下,种子发芽和其幼苗根与冠的生长及生理生化的响应。研究发现,60 mg·L~(-1)碳纳米管对水稻种子发芽及幼苗根生物量无明显影响,但使幼苗冠生物量增加了约29%,并同时激活了水稻幼苗中抗氧化系统酶。1.2 mg·L~(-1)菲使水稻发芽率降低了约22%,使幼苗根与冠生物量分别下降了约33%和44%,并抑制抗氧化系统酶活性,对水稻产生显著氧化损伤。同时暴露时,碳纳米管对菲的吸附作用(2 h内吸附量约50%)降低了菲的生物有效性。因此,同时暴露与菲单独暴露比,发芽率与空白无显著差异而冠生物量比空白增加了约19%,虽酶活受抑并发生了过氧化,但过氧化产物累积量显著低于菲单独暴露的情况。因此,碳纳米材料与有机污染物同时存在可缓和有机污染物对植物的毒害,碳纳米材料进入环境可能改变环境中污染物的生态风险。
译 名：
Exposure to carbon nanotube and phenanthrene:Impact on germination and seedling growth of rice
作 者：
ZHONG Jian-dan;CHEN Hong-chun;LUO Chun-yan;LI Ke-cen;XIANG Jun-jun;WANG Li-lin;DENG Shi-huai;College of Environmental Sciences, Sichuan Key Laboratory of Agricultural Environmental Engineering, Sichuan Agricultural University;Analysis and Test Center, 605 Group of Metallurgical Geological Prospecting Bureau;River Management Office of Pengshan Water Supplies Bureau;Linqiong Industrial Park Management Committee;
单 位：
ZHONG Jian-dan%CHEN Hong-chun%LUO Chun-yan%LI Ke-cen%XIANG Jun-jun%WANG Li-lin%DENG Shi-huai%College of Environmental Sciences, Sichuan Key Laboratory of Agricultural Environmental Engineering, Sichuan Agricultural University%Analysis and Test Center, 605 Group of Metallurgical Geological Prospecting Bureau%River Management Office of Pengshan Water Supplies Bureau%Linqiong Industrial Park Management Committee
关键词：
carbon nanomaterial;;persistent organic pollutant;;phytotoxicity;;antioxidant enzyme;;ecological risk
摘 要：
To investigate the ecological risk of carbon nanomaterials and persistent organic pollutants, hydroponic experiments were carried out to test the germination, growth, and physiological and biochemical response of rice that was exposed to multi-walled carbon nanotube(MWCNT)and/or phenanthrene. Compared to the control, 60 mg·L~(-1) MWCNT had no obvious effects on the seed germination rate and root biomass of rice seedlings but increased the shoot biomass by approximately 29% and at the same time activated the antioxidant enzyme. 1.2 mg·L~(-1) phenanthrene decreased the seed germination rate by 22% and the root and shoot biomass by 33% and 44%, respectively. In addition, phenanthrene inhibited antioxidant enzyme activities and led to oxidative damage to the plant. When MWCNT and phenanthrene coexisted, the adsorption of phenanthrene to MWCNT(adsorbed amount was around 50% in 2 h)reduced the bioavailability of phenanthrene.Thus, compared with exposure to phenanthrene alone, the germination rate showed no significant difference from that of the control group;however, the shoot biomass was about 19% higher than that of the control. Although the antioxidant enzyme activities were inhibited and peroxidation took place, the accumulated amount of peroxidation product was much lower than that of the group exposed to phenanthrene alone. The coexistence of carbon nanomaterials and organic pollutants will thus alleviate the phytotoxicity caused by organic pollutants, and the introduction of carbon nanomaterials to the environment may change the ecological risk of environmental pollutants.
