Morales Pontet Natalia Gabriela, Fernández Carolina, Perillo Vanesa Liliana, La Colla Noelia Soledad, Serra Analía Verónica, Botté Sandra Elizabeth
Instituto Argentino de Oceanografía, CONICET - Universidad Nacional del Sur (UNS), Camino Carrindanga 7.5 Km, B8000FWB, Bahia Blanca, Argentina.
Instituto de Investigaciones Bioquímicas de Bahía Blanca, CONICET - Universidad Nacional del Sur (UNS), Camino Carrindanga 7.5 Km, B8000FWB, Bahia Blanca, Argentina.
Environ Monit Assess. 2023 Mar 28;195(4):516. doi: 10.1007/s10661-023-11134-8.
Microbial mats have a special role in the removal of metals in marine environment. This study aimed to experimentally determine the efficiency of Cr removal from seawater by microbial mats. The effect of Cr on the microphytobenthic community and the influence of an aerated condition on the removal of metal and microorganisms were also considered. Hence, microbial mat samples were subdivided in 4 groups: submerged in Cr (chromium 2 mg/L without aeration), Cr + O (chromium 2 mg/L with aeration), SW + O (filtered seawater with aeration), and a control: SW (filtered seawater with neither chromium nor aeration). Water and microbial mat subsamples were used to determine Cr concentrations, organic matter content, granulometry, physicochemical parameters, chlorophyll a, phaeopigments, and quantitative analysis of the microphytobenthic community. Cr removal efficiency from seawater was 95% for the Cr treatment and 99% for the Cr + O treatment. The abundance of cyanobacteria tended to decrease between the initial and final days of the assay, whereas the opposite trend was observed for diatoms. Two aspects are worth noting in the paper: microbial mats efficiently removed Cr from seawater at a concentration of 2 mg Cr/L and the removal of Cr by microbial mats was more efficient with water aeration.
微生物垫在海洋环境中金属去除方面具有特殊作用。本研究旨在通过实验确定微生物垫从海水中去除铬的效率。同时还考虑了铬对微型底栖植物群落的影响以及曝气条件对金属和微生物去除的影响。因此，将微生物垫样本分为4组：浸没在铬中（2毫克/升铬，不曝气）、铬+氧气（2毫克/升铬，曝气）、海水+氧气（过滤后的海水，曝气），以及对照组：海水（既无铬也无曝气的过滤海水）。用水和微生物垫子样本测定铬浓度、有机质含量、粒度、理化参数、叶绿素a、叶褐素以及微型底栖植物群落的定量分析。铬处理组对海水中铬的去除效率为95%，铬+氧气处理组为99%。在试验的初始和最终天数之间，蓝藻的丰度趋于下降，而硅藻则呈现相反的趋势。本文有两个方面值得注意：微生物垫能有效去除浓度为2毫克/升铬的海水中的铬，并且在水曝气的情况下，微生物垫对铬的去除效率更高。
