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首页> 外文期刊>Environmental toxicology and chemistry >Diffusive Gradients in Thin Films Can Predict the Toxicity of MetalMixtures toTwoMicroalgae: Validation for Environmental Monitoring in Antarctic Marine Conditions
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Diffusive Gradients in Thin Films Can Predict the Toxicity of MetalMixtures toTwoMicroalgae: Validation for Environmental Monitoring in Antarctic Marine Conditions

机译：薄膜中的扩散梯度可以预测金属混合物Totwomicroalgae的毒性：南极海洋病症中的环境监测验证

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Anthropogenic contamination in the Antarctic near-shore marine environment is a challenge for environmental managers because of its isolation, high costs associated with monitoring and remediation activities, and the current lack of Antarctic-specific ecotoxicological data. The present study investigated the application of diffusive gradients in thin films (DGT) with a Chelex-100 binding resin for metal contaminant assessment in Antarctic marine conditions. Diffusion coefficients for cadmium (Cd), copper (Cu), nickel (Ni), lead (Pb), and zinc (Zn), determined at 1 degrees C, ranged between 2.1 and 2.6x10(-6) cm(2)/s and were up to 32% lower than those derived by theoretical calculations. Competition of metals on the DGT binding resin was observed at subsaturation concentrations, reducing the effective capacity for metal uptake by approximately 60%. The lability of the dissolved (0.45 mu m filterable) Cd, Cu, Pb, and Zn metal fraction to DGT was generally 90% and unaffected by the presence of the Antarctic marine microalga Phaeocystis antarctica. Both DGT and dissolved metal concentrations gave equivalent mixture toxicity predictions in independent action and concentration addition models to P. antarctica and Cryothecomonas armigera; that is, predictions using DGT-labile concentrations also showed antagonism to P. antarctica, which agrees with previously determined mixture interactivity. The benefits of DGT over traditional sampling techniques (i.e., discrete water sampling) include lower method detection limits (MDLs), in situ assessment, and time-averaged concentrations which capture pulses of contamination typical of the Antarctic near-shore marine environment. The present study provides MDLs and recommended minimum deployment times to guide field deployments in Antarctica. Environ Toxicol Chem 2019;38:1323-1333. (c) 2019 SETAC
机译：南极近岸海洋环境中的人为污染是对环境管理人员的挑战，因为其与监测和修复活动相关，高昂的成本，以及目前缺乏南极特异性生态毒理学数据。本研究研究了在南极海洋病症中的金属污染物评估的Chelex-100结合树脂在薄膜（DGT）中施加衍射梯度。在1℃下测定的镉（Cd），铜（Cu），镍，镍（Ni），铅（Pb）和锌（Zn）的扩散系数，范围为2.1至2.6×10（-6）cm（2）/ S且比理论计算得出的那些低32％。在余产浓度下观察到DGT结合树脂上的金属竞争，降低了金属吸收的有效能力约60％。溶解（0.45μm-moM m可过滤）Cd，Cu，Pb和Zn金属级分的可易率通常为dgt，并且通过南极海洋Microalga Phaeocystis抗野猫的存在不受影响。 DGT和溶解的金属浓度均为独立的作用和浓度添加模型中的相同的混合物毒性预测到P. Antarctica和Cryothecomonas Armigera;也就是说，使用DGT - 不稳定浓度的预测也表现出对抗野猫的拮抗作用，这与先前确定的混合物相互作用同意。 DGT对传统采样技术的益处（即离散水采样）包括较低的方法检测限制（MDL），原位评估和时间平均浓度，其捕获南极近岸海洋环境典型的污染脉冲。本研究提供了MDLS和推荐的最低部署时间来指导南极洲的现场部署。环境毒素科学2019; 38：1323-1333。 （c）2019 Setac

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