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Interaction of benzo[a]pyrene with Cu(II)-montmorillonite: Generation and toxicity of environmentally persistent free radicals and reactive oxygen species
Zhao, S (Zhao, Song)[ 1 ]; Miao, D (Miao, Duo)[ 1 ]; Zhu, KC (Zhu, Kecheng)[ 1 ]; Tao, KL (Tao, Kelin)[ 1 ]; Wang, CY (Wang, Chuanyi)[ 2 ]; Sharma, VK (Sharma, Virender K.)[ 3 ]; Jia, HZ (Jia, Hanzhong)[ 1 ]
2019
Source PublicationENVIRONMENT INTERNATIONAL
ISSN0160-4120
Volume129Issue:8Pages:154-163
Abstract

This paper presents the interaction of benzo[a]pyrene (B[a]P) with Cu(II)-montmorillonite to investigate the formation, evolution and potential toxicity of environmentally persistent free radicals (EPFRs) under dark and visible light irradiation conditions. Degradation of B[a]P and the generated transformative products on clay mineral are monitored by gas chromatography-mass spectrometry (GC-MS) technique. Hydroxyl-B[a]P and B[a]P-diones are observed during the transformation of B[a]P under dark condition. B[a]P-3,6-dione and B[a]P-6,12-dione are the main products under visible light irradiation. B[a]P transformation is accompanied by the formation of EPFRs, which are quantified by electron paramagnetic resonance (EPR) spectroscopy. With increasing reaction time, the concentrations of the produced EPFRs are initially increased and then gradually decrease to an undetectable level. The deconvolution results of EPR spectra reveal formation of three types of organic radicals (carbon-centered radicals, oxygen-centered radicals, and carbon-centered radicals with a conjugated oxygen), which also co-exist. Correspondingly, visible-light irradiation promotes the formation and the decay of these EPFRs. The produced B[a]P-type EPFRs induce the generation of reactive oxygen species (ROS), such as superoxide (O-2(-center dot)) and hydroxide radicals ((OH)-O-center dot), which may cause oxidative stress to cells and tissues of organisms. The toxicity of degradation products is evaluated by the livability of human gastric epithelial GES-1cells. The toxicity is initially increased and then decreases with the elapsed reaction time, which correlates with the evolution of EPFRs concentrations. The present work provides direct evidence that the formation of EPFRs in interaction of PAHs with metal-contaminated clays may result in negative effects to human health.

KeywordEnvironmentally persistent free radicals Benzo[a]pyrene Montmorillonite Soil Toxicity
DOI10.1016/j.envint.2019.05.037
Indexed BySCI
WOS IDWOS:000470239200017
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Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/5752
Collection环境科学与技术研究室
Affiliation1.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Peoples R China
3.Texas A&M Univ, Sch Publ Hlth, Program Environm & Sustainabil, Dept Occupat & Environm Hlth, College Stn, TX 77843 USA
Recommended Citation
GB/T 7714
Zhao, S ,Miao, D ,Zhu, KC ,et al. Interaction of benzo[a]pyrene with Cu(II)-montmorillonite: Generation and toxicity of environmentally persistent free radicals and reactive oxygen species[J]. ENVIRONMENT INTERNATIONAL,2019,129(8):154-163.
APA Zhao, S .,Miao, D .,Zhu, KC .,Tao, KL .,Wang, CY .,...&Jia, HZ .(2019).Interaction of benzo[a]pyrene with Cu(II)-montmorillonite: Generation and toxicity of environmentally persistent free radicals and reactive oxygen species.ENVIRONMENT INTERNATIONAL,129(8),154-163.
MLA Zhao, S ,et al."Interaction of benzo[a]pyrene with Cu(II)-montmorillonite: Generation and toxicity of environmentally persistent free radicals and reactive oxygen species".ENVIRONMENT INTERNATIONAL 129.8(2019):154-163.
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