Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant
Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant
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在非离子表面活性剂存在下植物加速菲和芘从水中的消散
DOI：
10.1016/j.chemosphere.2005.09.058
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发表时间：
2006-06-01
期刊：
影响因子：
8.8
通讯作者：
Wong, MH
中科院分区：
文献类型：
--
作者：
Gao, YZ;Ling, WT;Wong, MH
研究了非离子表面活性剂Brij 35对菲和芘在水中的植物加速消散作用。所涉及的机制进行了评估，根据植物吸收这些化合物的水与Brij 35的调查。黑麦草（多花黑麦草林）的存在下，明显增强了测试的多环芳烃在水中的消散0-296毫克升（-1）Brij 35。一级速率常数（K），从一级动力学模型计算这些多环芳烃降解（P < 0.05，n = 8），菲和芘的释放量分别比对照增加16.7-50%和47.1-108%，前者的半衰期（T-1/2）分别比后者小14.3-33.4%和32.0-52.0%。然而，促进多环芳烃消散被发现与Brij 35浓度的增加显着下降。在0-296毫克l（-1）的范围内，低浓度（= 148毫克l（-1））显着限制植物吸收这些多环芳烃。菲和芘的植物积累分别占种植水体和非种植水体中这些化合物耗散增强的6.21-35.0%和7.66-24.3%。此外，植物代谢被推测是植物加速这些多环芳烃在水体中的耗散的另一个主要机制。研究结果为植物修复表面活性剂污染水体中多环芳烃的可行性提供了依据。(c)2005爱思唯尔有限公司保留所有权利。
Plant-accelerated dissipation of phenanthrene and pyrene in water in the presence of a nonionic-surfactant (Brij35) was studied. The mechanisms involved were evaluated, based on the investigation of plant uptake of these compounds from water with Brij35. The presence of ryegrass (Lolium multiflorum Lam) clearly enhanced the dissipation of tested PAHs in water with 0-296 mg l(-1) Brij35. The first-order rate constants (K), calculated from the first-order kinetic models for these PAH degradation (all significant at P < 0.05, n = 8), of phenanthrene and pyrene in the presence of ryegrass were 16.7-50% and 47.1-108% larger than those of plant-free treatments, whereas half-lives (T-1/2) of the former were 14.3-33.4% and 32.0-52.0% smaller than the latter, respectively. However, the promotion of PAH dissipation by ryegrass was found to significantly decrease with increasing Brij35 concentrations. In the range of 0-296 mg l(-1), low concentrations (= 148 mg l(-1)) markedly restricted plant uptake of these PAHs. Plant accumulation of phenanthrene and pyrene accounted for 6.21-35.0% and 7.66-24.3% of the dissipation enhancement of these compounds from planted versus unplanted water bodies. In addition, plant metabolism was speculated to be another major mechanism of plant-accelerated dissipation of these PAHs in water systems. Results obtained from this study provided some insight with regard to the feasibility of phytoremediation for PAH contaminated water bodies with coexisted contaminants of surfactants. (c) 2005 Elsevier Ltd. All rights reserved.