游海萍;汪婷;徐国忠;陈祖亮;

• 1:福建师范大学环境科学与工程学院
• 2:福建省污染控制与资源循环利用重点实验室
• 3:福建省农业科学院农业生态研究所(红萍研究中心)

摘要(Abstract)：

研究了投加不同质量浓度纳米二氧化钛(nTiO2)颗粒对卡洲萍(Azolla aroliniana)同步富集混合溶液中Cu(Ⅱ)和Cr(Ⅵ)的影响.结果显示,卡洲萍同步富集Cu(Ⅱ)和Cr(Ⅵ)时,对Cu(Ⅱ)和Cr(Ⅵ)的富集量分别为12.02 mg·g-1和4.17 mg·g-1,对Cu(Ⅱ)的富集效率明显高于Cr(Ⅵ).当nTiO2的投加量为300 mg·L-1时,卡洲萍对Cu(Ⅱ)和Cr(Ⅵ)的富集量分别下降50.8%和14.3%.红外分析显示卡洲萍在nTiO2存在的条件下可以诱导产生更多的蛋白质,核酸等物质,这些物质可以增强植物的抗逆性,以减轻重金属毒害;SEM和EDS图谱表明Cu(Ⅱ)和Cr(Ⅵ)吸附在nTiO2颗粒上,增大进入植物体的难度,降低了进入萍体中重金属的量;且nTiO2质量浓度较高时本身也会对卡洲萍产生毒性,胁迫植物体分泌一些高分子生物聚合物,影响植物吸收Cu(Ⅱ)和Cr(Ⅵ).最后,通过回归分析结果显示,卡洲萍富集重金属阳离子Cu(Ⅱ)和重金属阴离子Cr(Ⅵ)的响应机制相同,与重金属离子的电性无关.本文研究结果表明nTiO2进入水体,与水体中重金属离子相互作用,将Cu(Ⅱ)和Cr(Ⅵ)吸附在纳米颗粒表面,而增大其进入植物体的难度,影响其与水生植物的相互作用.

关键词(KeyWords)： 纳米二氧化钛;卡洲萍;Cu(Ⅱ);Cr(Ⅵ);植物富集

Abstract:

Keywords:

基金项目(Foundation): 福建师范大学闽江学者人才引进基金资助项目(200604)

作者(Authors): 游海萍;汪婷;徐国忠;陈祖亮;

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