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Determination of iron speciation in lake and its effects through iron availability on algal blooming

湖中铁形态的测定及其铁可用性对藻类繁殖的影响

基本信息

批准号：
17310013
负责人：
IMAI Akio
金额：
$ 10.07万
依托单位：
National Institute for Environmental Studies
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17310013/
关键词：
Iron Lake peciation Algal bloom Dissolved organic matter River Cyanobacteria Aquauatic humic substances 錯化ボルタンメトリー AGP

项目摘要

Analytical methods were developed to determine the concentration of total dissolved iron and its chemical speciation in freshwater using cathodic stripping voltammetry (CSV) with 1-nitroso-2-naphthol (NN) at pH 8.1.The horizontal distribution and temporal variation of dissolved iron and its chemical speciation in Lake Kasumigaura and its inflowing rivers were investigated. Concentrations of dissolved iron and its organic ligands clearly decreased as lake water flowed from the river entry points toward the center of the lake, indicating their riverine origin. The fraction of iron occurring in organic complexes tended to increase with the water -flow. Most of the dissolved iron was present as organic complexes (882% 99.9%).Effects of iron complexation with DOM on algal growth in the eutrophic Lake Kasumigaura were assessed using 2 species of cyanobacteria, Microcystis aeruginosa and Planktothrix agardhii, by combining the algal growth potential (AGP) test and pretreatment of DOM decomposition by UV irradiation. Iron limited the 2 species, as did nitrogen and phosphorus in Lake Kasumigaura. Moreover, the growth of the 2 species was inhibited by iron complexation with DOM.The growth characteristics of two species of cyanobacteria, Microcystis aeruginosa and Planktothrix agardhii, in iron-limited continuous cultures were investigated. The relationships between dissolved iron concentration, cell quota of iron, and population growth rate were determined applying two equations, Monod's and Droop's equations. A kinetic model under iron limitation was developed based on the growth characteristics determined in this study. The model simulation suggested that Microcystis is a superior competitor under iron limitation.

采用1-亚硝基-2-萘酚（NN）阴极溶出伏安法（CSV），在pH8.1的条件下，测定了淡水中溶解态铁的含量及其化学形态。溶解铁及其有机配体的浓度明显下降，湖水从河流入口点流向湖中心，表明其河流起源。铁在有机络合物中所占的比例随水流量的增加而增加.以富营养化的霞浦湖为研究对象，以铜绿微囊藻（Microcystisaeruginosa）和阿氏浮游发藻（Planktothrixagardhii）为实验材料，结合藻类生长势（AGP）测定和紫外线照射分解DOM的预处理，研究了铁与DOM络合对藻类生长的影响。铁限制了这两个物种，氮和磷在霞浦湖。研究了铜绿微囊藻（Microcystis aeruginosa）和阿氏浮游发藻（Planktothrix agardhii）在铁限制连续培养条件下的生长特性。应用莫诺方程和德鲁普方程确定了溶解铁浓度、铁细胞配额和种群增长率之间的关系。根据本研究确定的生长特性，建立了铁限制下的生长动力学模型。模拟结果表明，微囊藻在铁限制条件下是一个上级竞争者。