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首页> 外文期刊>Environmental toxicology and chemistry >EFFECTS OF SILVER NANOPARTICLES ON BACTERIAL ACTIVITY IN NATURAL WATERS
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EFFECTS OF SILVER NANOPARTICLES ON BACTERIAL ACTIVITY IN NATURAL WATERS

机译：银纳米颗粒对天然水中细菌活性的影响

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Silver nanoparticles (AgNPs) may be introduced into aquatic ecosystems because of their widespread use as antimicrobial agents. However, few studies have investigated the impacts of AgNPs on natural aquatic microbial activity in an environmentally relevant context. In this study, bacterioplankton were collected from nine aquatic habitats and exposed to six concentrations of carboxy-functionalized AgNP (ViveNano, 10-nm particle size, 20% Ag w/w) over 48 h. After 1 h of exposure, bacterial production and extracellular alkaline phosphatase affinity were significantly reduced in all AgNP-exposed samples. However, across a 48-h exposure, extracellular aminopeptidase affinity was not consistently impacted by AgNPs. After 48 h, bacterial production recovered by 40 to 250% at low AgNP nominal concentrations (0.05 and 0.1 mg/L) but remained inhibited at the two highest AgNP nominal concentrations (1 and 10 mg/L). In contrast, AgNO_3 additions between 0.01 to 2 mg Ag/L fully inhibited bacterial production over the 48-h exposure. At 48-h exposure, the lowest observed effective concentrations and average median effective concentration for bacterial production ranged from 8 to 66 and 15 to 276 μg Ag/L, respectively. Thus, in natural aquatic systems, AgNP concentrations in the nanogram per liter range are unlikely to negatively impact aquatic biogeochemical cycles. Instead, exposures in the low microgram per liter range would likely be required to negatively impact natural aquatic bacterioplankton processes.
机译：银纳米颗粒（AgNPs）可能由于被广泛用作抗菌剂而被引入水生生态系统。但是，很少有研究在环境相关的背景下研究AgNPs对天然水生微生物活性的影响。在这项研究中，从九个水生生境中收集了浮游细菌，并在48小时内暴露于六种浓度的羧基官能化AgNP（ViveNano，10 nm粒径，20％Ag w / w）。暴露1 h后，所有暴露于AgNP的样品中细菌产生和细胞外碱性磷酸酶亲和力均显着降低。但是，在48小时的暴露中，AgNPs不会始终影响细胞外氨基肽酶亲和力。 48小时后，在低AgNP标称浓度（0.05和0.1 mg / L）下，细菌产生恢复了40％至250％，但在两个最高AgNP标称浓度（1和10 mg / L）下仍然受到抑制。相反，在48小时的暴露时间内，添加0.01至2 mg Ag / L的AgNO_3完全抑制了细菌产生。在暴露48小时后，观察到的最低有效浓度和平均中值有效浓度分别为8至66和15至276μgAg / L。因此，在自然水生系统中，纳升/升范围内的AgNP浓度不太可能对水生生物地球化学循环产生负面影响。取而代之的是，可能需要在低微克/升的范围内进行暴露，才能对天然水生浮游生物过程产生负面影响。

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