Abstract
An established synchronous fluorimetry method was used for in situ investigation of the photodegradation of pyrene (PYR) and anthracene (ANT) adsorbed onto fresh leaves of the seedlings of two mangrove species, Aegiceras corniculatum (L.) Blanco (Ac) and Kandelia obovata (Ko) in multicomponent mixtures (mixture of the ANT and PYR). Experimental results indicated that photodegradation was the main transformation pathway for both ANT and PYR in multicomponent mixtures. The amount of the PAHs volatilizing from the leaf surfaces and entering the inner leaf tissues was negligible. Over a certain period of irradiation time, the photodegradation of both PYR and ANT adsorbed onto the leaves of Ac and Ko followed first-order kinetics, with faster rates being observed on Ac leaves. In addition, the photodegradation rate of PYR on the leaves of the mangrove species in multicomponent mixtures was much slower than that of adsorbed ANT. Compared with the PAHs adsorbed as single component, the photodegradation rate of ANT adsorbed in multicomponent mixtures was slower, while that of PYR was faster. Moreover, the photodegradation of PYR and ANT dissolved in water in multicomponent mixtures was investigated for comparison. The photodegradation rate on leaves was much slower than in water. Therefore, the physical-chemical properties of the substrate may strongly influence the photodegradation rate of adsorbed PAHs.
Highlights
Over 80% of the earth’s terrestrial surface is covered by vegetation [1]
Simple experimental conditions were set for study of the possible photolysis processes of some polycyclic aromatic hydrocarbons (PAHs) on the typical mangrove leaves. To further develop this line of research, synchronous fluorimetry was used for in situ studying the photodegradation of PYR and ANT adsorbed onto the leaves of two mangrove species in multicomponent mixtures
We established the synchronous fluorimetry method for the direct determination of PYR and ANT adsorbed onto Aegiceras corniculatum (L.) Blanco (Ac) and Kandelia obovata (Ko) leaves both as single compounds and in multicomponent mixtures
Summary
Over 80% of the earth’s terrestrial surface is covered by vegetation [1]. Vegetation plays a key role in the environmental fate of many polycyclic aromatic hydrocarbons (PAHs) [2]. Our previous research sought to elucidate the environmental behaviors of PAHs adsorbed onto mangrove leaves using an established synchronous fluorimetry combined with a fluorescence spectrophotometer and an optical fiber to directly detect PYR and ANT adsorbed onto mangrove leaves [29]. Because of the effects of complex factors mentioned above or others, it is difficult for in situ investigation the environmental behaviors of PAHs adsorbed on leaf surfaces in the field. Simple experimental conditions were set for study of the possible photolysis processes of some PAHs on the typical mangrove leaves To further develop this line of research, synchronous fluorimetry was used for in situ studying the photodegradation of PYR and ANT adsorbed onto the leaves of two mangrove species in multicomponent mixtures. Seedlings of Aegiceras corniculatum (L.) Blanco (Ac) and Kandelia obovata (Ko), two of the most widespread mangrove species in China, were selected for this study, and the photodegradation of equal quantities of PYR and ANT in water as single compounds and in multicomponent mixtures was investigated for comparison
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