Effects of metals on the uptake of polycyclic aromatic hydrocarbons by the cyanobacterium Microcystis aeruginosa.
Effects of metals on the uptake of polycyclic aromatic hydrocarbons by the cyanobacterium Microcystis aeruginosa.
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DOI：
10.1016/j.chemosphere.2014.08.013
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发表时间：
2015
期刊：
影响因子：
8.8
通讯作者：
Yuqiang Tao;B. Xue;Zhen Yang;Shu-chun Yao;Shanying Li
中科院分区：
文献类型：
--
作者：
Yuqiang Tao;B. Xue;Zhen Yang;Shu-chun Yao;Shanying Li
研究了Cu2+、Zn2+、Cd2+和Ag+对铜绿微囊藻吸收菲、芘和苯并[a]芘的影响。利用一种仿生被动采样器--三酸甘油酯包埋的醋酸纤维素膜(TECAM)来研究相关的机理。金属对微生物吸收多环芳烃的促进作用。铜绿素含量随金属(锌、镉、镉、铜、银)的柔软度顺序和多环芳烃的π施主强度(菲、芘、苯并[a]芘)的增加而增加。Cu2+、Ag+与多环芳烃之间的阳离子-π相互作用增加了多环芳烃的自由溶解浓度，从而增加了M对多环芳烃的吸收。铜绿假单胞菌。Cu2+和Ag+引起的溶解有机物(DOM)芳香度的增加也促进了多环芳烃的吸收。Cu2+和Ag+的促进作用超过了它们的毒性作用，从而促进了对多环芳烃的吸收。在锌、镉存在下，锌、镉与溶液中的多环芳烃不发生阳离子-π相互作用。DOM的芳香性降低，多环芳烃的扩散传质没有增强。因此，对多环芳烃的吸收减少了。这项研究表明，浮游植物对多环芳烃的吸收会受到金属和多环芳烃性质的显著影响，这将有助于了解富营养化水域中多环芳烃的去向和风险。
Effects of Cu2+, Zn2+, Cd2+, and Ag+on the uptake of phenanthrene, pyrene, and benzo[a]pyrene byMicrocystis aeruginosawere investigated. A biomimic passive sampler, triolein embedded cellulose acetate membrane (TECAM) was used to help to study the related mechanisms. The facilitation effects of the metals on the uptake of the PAHs byM. aeruginosaincreased with the softness order of the metals (Zn2+≈ Cd2+< Cu2+< Ag+) and the π donor strength of the PAHs (phenanthrene < pyrene < benzo[a]pyrene). The cation–π interactions between Cu2+, Ag+and the PAHs increased the freely dissolved concentrations of the PAHs, and consequently their uptake byM. aeruginosa. The increase in aromaticity of dissolved organic matter (DOM) caused by Cu2+, and Ag+also enhanced the uptake of the PAHs. The facilitation effects of Cu2+, and Ag+exceeded their toxic effects, uptake of the PAHs was thereby enhanced. In the presence of Zn2+, and Cd2+, no cation–π interactions between Zn2+, Cd2+and the PAHs formed in solutions. Aromaticity of DOM was reduced, the diffusive mass transfer of the PAHs was not enhanced. Uptake of the PAHs was thereby reduced. This study suggests that uptake of PAHs by phytoplankton can be significantly influenced by the properties of both metals and PAHs, which will help to understand the fate and risks of PAHs in eutrophic waters co-contaminated with metals.