Henriques Bruno, Lopes Cláudia B, Figueira Paula, Rocha Luciana S, Duarte Armando C, Vale Carlos, Pardal Miguel A, Pereira Eduarda
CESAM & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; CIIMAR, Interdisciplinary Centre of Marine and Environmental, Rua dos Bragas 289, 4050-123 Porto, Portugal.
CIIMAR, Interdisciplinary Centre of Marine and Environmental, Rua dos Bragas 289, 4050-123 Porto, Portugal; CICECO & Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
Chemosphere. 2017 Mar;171:208-222. doi: 10.1016/j.chemosphere.2016.12.086. Epub 2016 Dec 19.
Results of 7-days exposure to metals, using environmentally realistic conditions, evidenced the high potential of living Fucus vesiculosus to remove Pb, Hg and Cd from contaminated salt waters. For different contamination scenarios (single- and multi-contamination), ca 450 mg L (dry weight), enable to reduce the concentrations of Pb in 65%, of Hg in 95% and of Cd between 25 and 76%. Overall, bioconcentration factors ranged from 600 to 2300. Elovich kinetic model described very well the bioaccumulation of Pb and Cd over time, while pseudo-second-order model adjusted better to experimental data regarding Hg. F. vesiculosus showed different affinity toward studied metals, following the sequence order: Hg > Pb > Cd. Analysis of metal content in the macroalgae after bioaccumulation, proved that all metal removed from solution was bound to the biomass. Depuration experiments reveled no significant loss of metal back to solution. Exposure to contaminants only adversely affected the organism's growth for the highest concentrations of Cd and Pb. Findings are an important contribute for the development of remediation biotechnologies for confined saline waters contaminated with trace metal contaminants, more efficient and with lower costs than the traditional treatment methods.
在符合环境实际情况的条件下，对金属进行7天暴露试验的结果表明，活的墨角藻具有从受污染海水中去除铅、汞和镉的巨大潜力。对于不同的污染情况（单一污染和多重污染），约450毫克/升（干重）的墨角藻能够使铅浓度降低65%，汞浓度降低95%，镉浓度降低25%至76%。总体而言，生物富集系数在600至2300之间。埃洛维奇动力学模型很好地描述了铅和镉随时间的生物积累情况，而伪二级模型则更适合汞的实验数据。墨角藻对所研究金属的亲和力不同，顺序为：汞>铅>镉。生物积累后对大型藻类中金属含量的分析证明，从溶液中去除的所有金属都与生物量结合。净化实验表明，金属没有明显重新释放回溶液中。仅在镉和铅的最高浓度下，暴露于污染物才会对生物体的生长产生不利影响。这些发现对于开发针对受微量金属污染物污染的封闭咸水的修复生物技术具有重要意义，该技术比传统处理方法更高效且成本更低。
