摘要
探究水葫芦对Cr(Ⅲ)污染水体的修复能力.水葫芦在质量浓度分别为5,10,15,20,25 mg/L的Cr(Ⅲ)培养液中生长4周后,采用电感耦合等离子体质谱(ICP-MS)测定了水葫芦根和叶中Cr(Ⅲ)的质量浓度,并计算了水葫芦的生物富集系数(BCF)和转移因子(TF).水葫芦对Cr(Ⅲ)表现出了较好的耐受性,生物量随着Cr(Ⅲ)质量浓度的增加而增加,但在Cr(Ⅲ)质量浓度为25 mg/L时,根部叶片出现了萎黄现象.根的Cr(Ⅲ)质量浓度高于1 000 mg/kg以上(培养液质量浓度≥10 mg/L时),说明水葫芦对Cr(Ⅲ)具有很强的富集能力.在Cr(Ⅲ)质量浓度为20 mg/L时,根和叶的BCF最大,分别为213.23和5.86;在Cr(Ⅲ)质量浓度为5 mg/L时,水葫芦的最大TF值为0.066,表明Cr(Ⅲ)主要蓄积在根部.水葫芦作为根和叶可以同时收获的浮水作物,将其用于Cr(Ⅲ)污染水体修复是可行的.
The objective of this study was to investigate Cr（Ⅲ）phytoremediation ability of water lettuce.The experiment was conducted with 5,10,15,20,25 mg/L Cr Cl3 in hydroponic system for 4 weeks and the Cr（Ⅲ） concentration in the root and shoot tissues were estimated by inductively coupled plasma mass spectrometer（ICP-MS）.The values obtained were used to evaluate the bioconcentration factor（BCF）and translocation factor（TF）of this plant.The plant showed high Cr（Ⅲ）tolerance and there was a general trend of increase in biomass,but the lower leaves appeared chlorosis at 25 mg/L.Cr（Ⅲ） concentration in roots was higher 1 000 mg/kg,which means that the plant has high accumulation capacity for Cr（Ⅲ）.The maximum BCF values for root and shoot tissues were 213.23 and 5.86 respectively,obtained for 20 mg/L Cr（Ⅲ）.The TF maxima was found to be 0.066 at 5 mg/L Cr（Ⅲ）,which points the vast majority of Cr（Ⅲ） was accumulated in the root of the plant.Water lettuce,as floating plant,can be recommended for phytoremediation purposes of Cr（Ⅲ）-contaminated water.
出处
《高师理科学刊》
2016年第6期44-47,共4页
Journal of Science of Teachers＇College and University
基金
教育部第48批"留学回国人员科研启动基金"项目
