Comparison of heavy metal accumulation by a bloom-forming cyanobacterium, Microcystis aeruginosa

被引:21
|
作者
Zeng Jin [1 ]
Zhao DaYong [2 ]
Ji YongBan [1 ]
Wu QingLong [1 ]
机构
[1] Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China
[2] Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China
来源
CHINESE SCIENCE BULLETIN | 2012年 / 57卷 / 28-29期
基金
中国国家自然科学基金;
关键词
Microcystis aeruginosa; cadmium; zinc; bioaccumulation; bioconcentration factor; BIOTIC LIGAND MODEL; FREE-ION ACTIVITY; CHLORELLA-KESSLERII; GREEN-ALGAE; BIOACCUMULATION; BIOSORPTION; TOXICITY; CADMIUM; WATER; PHYTOPLANKTON;
D O I
10.1007/s11434-012-5337-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Microcystis aeruginosa is the dominant species during cyanobacterial blooms in freshwater lakes. In the present study, we compared the bioaccumulation characteristics of cadmium (Cd) and zinc (Zn) in Microcystis cells. In short-term uptake tests, a rapid sorption of Cd and Zn occurred in the first few minutes, with a subsequent slower internalization process. No obvious difference was observed between Zn and Cd in terms of their short-term uptake kinetics. In efflux experiments, elimination of Zn from the cells was faster than that of Cd. In the 72-h exposure tests, the intracellular Cd concentrations increased with exposure time whereas the intracellular Zn concentrations always reached a plateau. The cellular Cd showed greater variation than the cellular Zn at various free Cd2+ or Zn2+ concentrations. The differences in Cd and Zn accumulation and elimination indicated that Microcystis cells had a higher bioaccumulation capacity for Cd than for Zn. In field studies, the bioconcentration factor (BCF) of Cd in lake-harvested Microcystis was more than 10 times higher than those of other metals. The results of the present study strongly suggested that the bloom-forming Microcystis may affect the Cd transportation and biogeochemical cycling in eutrophic freshwater ecosystems.
引用
收藏
页码:3790 / 3797
页数:8
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