title: [Studies on toxicity of four kinds of heavy metals in water by synchronous-scan fluorescence].
abstract: Spectrofluorometry of chlorella pyrenoidosa was studied by three dimensional excitation-emission (3DEEM) fluorescence spectroscopy and synchronous scan fluorescence spectroscopy with Delta gamma = 20 nm in the stress of Hg+, Cd2+, Cu2+ and Zn2+. The conclusion from two kinds of Spectrofluorometry was the same: after 96h stress by heavy metals, the maximum fluorescence values reduced obviously, chlorophyll-a and chlorophyll-b in the photosynthetic system were seriously damaged by heavy metal. Further analysis of the correlations between heavy metal concentration and fluorescence quenching efficiency I0/I can conclude that the toxicity of heavy metal and the fluorescence quenching efficiency I0/I were positively correlated, and they all increased with the heavy metal concentration and stress time. For one kind of heavy metals, synchronous scan fluorometry is a sensitive method for its toxicity assessment. Compared to 3DEEM fluorescence spectroscopy, synchronous scan fluorescence spectroscopy is less time consuming and of higher selectivity. It is suitable to assess the toxicity of pollutions in water.
authors.affiliation: Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. jbduan@aiofm.ac.cn
authors.forename: Jing-Bo
authors.initials: JB
authors.lastname: Duan
authors.forename: Wen-Qing
authors.initials: WQ
authors.lastname: Liu
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Nan-Jing
authors.initials: NJ
authors.lastname: Zhao
authors.forename: Zhi-Gang
authors.initials: ZG
authors.lastname: Wang
authors.forename: Gao-Fang
authors.initials: GF
authors.lastname: Yin
authors.forename: Li
authors.initials: L
authors.lastname: Fang
authors.forename: Jing
authors.initials: J
authors.lastname: Liu