首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Occurrence of emerging organic contaminants in a tropical urban catchment in Singapore
Authors:Xu Yonglan  Luo Fei  Pal Amrita  Gin Karina Yew-Hoong  Reinhard Martin
Institution:a Department of Environmental Science “G. Sarfatti”, University of Siena, Via P.A. Mattioli 4, 53100 Siena, Italy
b Institute of Biology and Ecology, Šafárik University, Mánesova 23, 041 67 Košice, Slovak Republic
Abstract:The aim of this study was to test in a short term laboratory experiment the accumulation and physiological effects of As in the epiphytic lichen Xanthoria parietina. Arsenic content in treated samples increased progressively with increasing concentration in treatment solutions. Treatment of X. parietina thalli with 0.1, 1, 10 ppm As solutions caused significant decrease of viability, measured as intensity of respiratory activity, and damages to cell membranes, assessed by increase of electric conductivity of rinsing water and lipid peroxidation products. Soluble proteins content decreased and H2O2 content increased already at the lowest As concentration tested (0.01 ppm). Photosynthetic efficiency, measured in terms of FV/FM ratio, decreased significantly only at the highest As concentration (10 ppm). It was concluded that As exposure causes physiological stress both on the mycobiont and the photobiont and that cell membrane damage, expressed in terms of electric conductivity of rinsing water, is the parameter most affected by As treatment.
Keywords:As  Bioaccumulation  Cell membrane damage  Photosynthesis  ROS
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号