Effects of humic and fulvic acids on the growth of Microcystis aeruginosa

被引：16
|
作者：
Ohkubo, N
Yagi, O
Okada, M
机构：
[1] Publ Bur Hitachi City, Dept Publ Water Supply, Hitachi, Ibaraki 3160025, Japan
[2] Natl Inst Environm Studies, Reg Environm Res Div, Tsukuba, Ibaraki 3050053, Japan
[3] Toho Univ, Fac Sci, Funabashi, Chiba 2740072, Japan
来源：
ENVIRONMENTAL TECHNOLOGY | 1998年 / 19卷 / 06期
关键词：
Microcystis; heavy metal; chelate substance; humic acid; fulvic acid;
D O I：
10.1080/09593331908616717
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effects of chelate substances on the growth of Microcystis aeruginosa K-5 in Lake Kasumigaura water were investigated. A chelate compound, EDTA (Ethylenediaminetetraacetic acid disodium salt) and natural chelate substances, such as humic and fulvic adds isolated from Lake Kasumigaura sediment, stimulated the growth of the K-5 strain. We investigated the mechanism of this stimulation by chelate compounds. The toxicity of heavy metals such as copper, nickel, and zinc, and the alleviation of heavy metal toxicity by chelate compounds were determined. The 50% growth inhibition (EC50) values of copper and zinc for the K-5 strain were 8.4 and 11.4 mu g l(-1), respectively, close to levels measured in Lake Kasumigaura. Humic and fulvic adds mitigated copper and zinc toxicity. Humic and fulvic adds may significantly affect the occurrence of water blooms of Microcystis in Lake Kasumigaura.
引用
收藏
页码：611 / 617
页数：7
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