Influence of initial pesticide concentrations and plant population density on dimethomorph toxicity and removal by two duckweed species
Influence of initial pesticide concentrations and plant population density on dimethomorph toxicity and removal by two duckweed species
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DOI：
10.1016/j.scitotenv.2010.01.057
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发表时间：
2010-04-15
影响因子：
9.8
通讯作者：
Eullaffroy, Philippe
中科院分区：
文献类型：
--
作者：
Dosnon-Olette, Rachel;Couderchet, Michel;Eullaffroy, Philippe
水生植物吸收、转化和隔离有机污染物，因此可用于去除废水中污染物的植物修复。需要更好地了解影响水生植物吸收污染物速率的因素，以改善去除废水中污染物的工程系统。本工作着重研究了农药初始浓度和植物种群密度对两种浮萍对杀菌剂烯酰吗啉的毒性和吸收的影响。观察到随着浮萍种群密度的增加，对烯酰吗啉的敏感性增加。这可能解释了这种较高的敏感性和降低的去除率。毒性或污染物吸收与初始农药之间也存在正相关关系浓度，通过青萍和紫萍最大去除41和26 μ g g（-1）烯酰吗啡鲜重（烯酰吗啡为600 μ g L-1，初始密度为0 10 g E-烧瓶（-1））。分别这项研究还表明，这些水生植物可以有效地消除有机污染物，并可能最终在自然环境中作为植物修复剂（C）2010 Elsevier B. V.版权所有
Aquatic plants take up, transform and sequester organic contaminants and may therefore be used in phytoremediation for the removal of pollutants from wastewaters A better understanding of factors affecting the rate of contaminant uptake by aquatic plants is needed to improve engineered systems for removal of pollutants from wastewaters. This work focused on the influence of initial concentrations of pesticide and population density of plants on toxicity and uptake of the fungicide dimethomorph by two duckweed species An increased sensitivity to dimethomorph was observed with increasing duckweed population density Less light, due to crowding, may explain this higher sensitivity and reduced removal rate A positive relationship was also found between toxicity or contaminant uptake and initial pesticide concentration with a maximal removal of 41 and 26 mu g g(-1) fresh weight of dimethomorph (at 600 mu g L-1 of dimethomorph and an initial density of 0 10 g E-flask(-1)) by Lemna minor and Spirodela polyrhiza. respectively. This research also indicated that these aquatic plants can efficiently eliminate organic contaminants and may ultimately serve as phytoremediation agents in the natural environment (C) 2010 Elsevier B.V. All rights reserved