Occurrence of emerging organic contaminants in a tropical urban catchment in Singapore |
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Authors: | Xu Yonglan Luo Fei Pal Amrita Gin Karina Yew-Hoong Reinhard Martin |
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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 |
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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. |
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Keywords: | As Bioaccumulation Cell membrane damage Photosynthesis ROS |
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