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中国科学院海岸带环境... [4]
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河海大学学报. 自然... [1]
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发表日期:2019
语种:中文
文献类型:期刊论文
专题:中国科学院海岸带环境过程与生态修复重点实验室
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食用蔬菜能吸收和积累微塑料
期刊论文
科学通报, 2019, 卷号: 64, 期号: 9, 页码: 928-934
作者:
李连祯
;
周倩
;
尹娜
;
涂晨
;
骆永明
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浏览/下载:536/0
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提交时间:2020/06/17
微塑料
生菜
聚苯乙烯微球
吸收
积累
健康风险
microplastics
lettuce
polystyrene microbeads
uptake
accumulation
human health risk
Microplastic (MP, 100 nm-5 mm) may present an attributable risk to ecosystem and human health, and its pollution has become a global environmental concern. Despite a wealth of information on the accumulation of MPs in aquatic species, there is no information on the uptake and accumulation of MPs by higher plants. Terrestrial edible plants are directly exposed to MPs when agricultural soil was applied with organic manure, sewage sludge as fertilizer or plastic mulching. In this paper, the uptake of two sizes of polystyrene (PS) microbeads (0.2 and 1.0 mum) and then their distribution and migration in an edible plant lettuce were firstly investigated based on laboratory experiments. We used fluorescent markers to track PS microbeads in plant tissues and found fluorescence to be a sensitive and reliable detection method. Sections from untreated control lettuce showed no autofluorescence. When roots were treated with fluorescently labeled PS microbeads, the microbeads could be identified by its fluorescence. Our main study investigated the uptake of 0.2 mum beads, as few luminescence signals were observed in lettuce roots for 1.0 mum beads in our experiment. We observed that 0.2 mum fluorescent microbeads were extracellularly trapped in the root cap mucilage (which is a highly hydrated polysaccharide) and a dark green tip (which was typical of lettuce roots exposed to label PS beads) was usually visible to the naked eye. Confocal images revealed that the PS luminescence signals were mainly located in the vascular system and on the cell walls of the cortex tissue of the roots, indicated that the beads passed through the intercellular space via the apoplastic transport system. Once inside the central cylinder, the 0.2 mum PS beads were transferred from the roots to the stems and leaves via the vascular system following the transpiration stream. We also observed that the PS beads adhered to one another and self-assembled systematically into grape-like and (chain) string-like clusters in the intercellular space of the root and stem vascular tissue of lettuce plant. In contrast to the root and stem, PS beads were dispersed in the leaf tissue. Here, for the first time we provide evidence of the adherence, uptake, accumulation, and translocation of submicrometer MPs within an edible plant. Our findings highlight the previously underappreciated human exposure pathway to MPs through the consumption of contaminated crops and emphasize the need for new management strategies to control the release of MPs waste products into the terrestrial environment. Ultimately, the potential impacts of low range sized MPs on food safety of crop plants and human health need to be urgently considered.
溴系阻燃剂毒理效应的计算模拟预测与环境风险评估进展
期刊论文
生态毒理学报, 2019, 卷号: 14, 期号: 4, 页码: 2-13
作者:
李斐
;
王晓晴
;
刘佳琳
;
孟祥敬
;
吉成龙
;
吴惠丰
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Adobe PDF(784Kb)
  |  
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  |  
浏览/下载:816/374
  |  
提交时间:2020/07/08
溴系阻燃剂
毒理效应
计算毒理学
风险评估
Brominated Flame Retardants (Bfrs)
Toxicological Effect
Computational Toxicology
Risk Assessment
海洋微塑料检测技术研究进展
期刊论文
海洋通报, 2019, 卷号: 38, 期号: 6, 页码: 601-612
作者:
王俊豪
;
梁荣宁
;
秦伟
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  |  
Adobe PDF(661Kb)
  |  
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  |  
浏览/下载:1212/381
  |  
提交时间:2020/07/08
海洋微塑料
目视分析法
光谱分析法
热分析法
Ocean Microplastics
Visual Analysis
Spectroscopic Analysis
Thermal Analysis
多层纤维球生物滤池净化工厂化养殖循环水处理
期刊论文
河海大学学报. 自然科学版, 2019, 卷号: 47, 期号: 4, 页码: 304-309
作者:
吕剑
;
于晓斌
;
张宇轩
;
武君
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Adobe PDF(1291Kb)
  |  
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  |  
浏览/下载:598/258
  |  
提交时间:2020/07/08
工厂化循环水养殖
多层纤维球滤料
生物滤池
污染物去除效果
多级复氧
同步硝化和反硝化
Recirculating Aquaculture System
Multi-layer Fiber Ball Filter
Biological Filter
Effect Of Biological Removal
Multi-level Reaeration
Simultaneous Nitrification And deNitrification