Phytoremediation of imazalil and tebuconazole by four emergent wetland plant species in hydroponic medium

被引:56
作者
Lv, Tao [1 ]
Zhang, Yang [1 ,2 ]
Casas, Monica E. [3 ]
Carvalho, Pedro N. [1 ]
Arias, Carlos A. [1 ]
Bester, Kai [3 ]
Brix, Hans [1 ]
机构
[1] Aarhus Univ, Dept Biosci, DK-8000 Aarhus C, Denmark
[2] S China Normal Univ, Coll Life Sci, Guangzhou 510631, Guangdong, Peoples R China
[3] Aarhus Univ, Dept Environm Sci, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
关键词
Constructed wetland; Ecotechnology; Aquatic macrophytes; Phytotoxicity; Pesticide; Fungicide; TYPHA-LATIFOLIA L; WASTE-WATER; PESTICIDE MITIGATION; CONSTRUCTED WETLANDS; CROP PLANTS; DEGRADATION; ANTIMICROBIALS; DISSIPATION; FUNGICIDES; EFFICIENCY;
D O I
10.1016/j.chemosphere.2016.01.064
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Pollution from pesticide residues in aquatic environments is of increasing concern. Imazalil and tebuconazole, two commonly used systemic pesticides, are water contaminants that can be removed by constructed wetlands. However, the phytoremediation capability of emergent wetland plants for imazalil and tebuconazole, especially the removal mechanisms involved, is poorly understood. This study compared the removal of both pesticides by four commonly used wetland plants, Typha latifolia, Phragmites australis, Iris pseudacorus and Juncus effusus, and aimed to understand the removal mechanisms involved. The plants were individually exposed to an initial concentration of 10 mg/L in hydroponic solution. At the end of the 24-day study period, the tebuconazole removal efficiencies were relatively lower (25%-41%) than those for imazalil (46%-96%) for all plant species studied. The removal of imazalil and tebuconazole fit a first-order kinetics model, with the exception of tebuconazole removal in solutions with I. pseudacorus. Changes in the enantiomeric fraction for imazalil and tebuconazole were detected in plant tissue but not in the hydroponic solutions; thus, the translocation and degradation processes were enantioselective in the plants. At the end of the study period, the accumulation of imazalil and tebuconazole in plant tissue was relatively low and constituted 2.8-14.4% of the total spiked pesticide in each vessel. Therefore, the studied plants were able to not only take up the pesticides but also metabolise them. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:459 / 466
页数:8
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