title: In situ determination of the depuration of three- and four-ringed polycyclic aromatic hydrocarbons co-adsorbed onto mangrove leaf surfaces.
abstract: A dual-wavelength fiber-optic fluorimetry for the in situ simultaneous determinations of fluorene (Flu), phenanthrene (Phe) and pyrene (Pyr) adsorbed onto the leaf surfaces of living Avicennia marina (Am) seedling were developed and used to study the depuration kinetics of the three PAHs, adsorbed individually or mixed together, onto living Am leaf surfaces. Limits of detection for the in situ measurements of adsorbed Flu, Phe and Pyr were 4.62, 2.75 and 1.38 ng spot(-1), respectively. The depuration kinetics of the three selected polycyclic aromatic hydrocarbons (PAHs) are divided into rapid and slow phases; both phases followed the same first-order kinetics with relative clearance rates of Flu > Phe > Pyr during the rapid phase, and a clearance rate order of Pyr > Flu > Phe during the slow phase. For the three PAHs co-adsorbed on living Am leaf surfaces, a significant synergistic effect was detected during the rapid phase clearance; conversely, an antagonistic effect was observed during the slow phase. However, the synergistic effect dominated during both phases of the depuration process, and the co-adsorption of PAHs promoted the clearance of all three compounds from the mangrove leaf surfaces. These findings demonstrate a novel analytical method for in situ characterization of multiple PAHs adsorbed onto the plant surfaces.
authors.affiliation: College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Sun
authors.affiliation: College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Shi
authors.affiliation: College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Guo
authors.affiliation: State Key Laboratory of Marine Environmental Science (Xiamen University), College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; Zhangzhou Institute of Technology, Zhangzhou 363000, China. Electronic address: yzhang@xmu.edu.cn.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Environment and Resource, Shanxi University, Taiyuan 030006, China.
authors.forename: Lusha
authors.initials: L
authors.lastname: Duan
mesh_terms: D000327:Adsorption; D032407:Avicennia / Q000737:chemistry* / Q000254:growth & development; D001673:Biodegradation, Environmental; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D005449:Fluorenes / Q000032:analysis / Q000737:chemistry; D005470:Fluorometry; D007700:Kinetics; D057230:Limit of Detection; D010616:Phenanthrenes / Q000032:analysis / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry* / Q000254:growth & development; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D011721:Pyrenes / Q000032:analysis / Q000737:chemistry; D036226:Seedlings / Q000737:chemistry / Q000254:growth & development
chemical_list: D004785:Environmental Pollutants; D005449:Fluorenes; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; C041509:fluorene; C031181:phenanthrene; C030984:pyrene
keywords: Avicennia marina; Depuration; Dual-wavelength fiber-optic fluorimetry; In situ; Polycyclic aromatic hydrocarbon