Abiotic formation of organoiodine compounds by manganese dioxide induced iodination of dissolved organic matter

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Abiotic formation of organoiodine compounds by manganese dioxide induced iodination of dissolved organic matter
	Hao, Zhineng; Wang, Juan; Yin, Yongguang; Cao, Dong; Liu, Jingfu
刊名	ENVIRONMENTAL POLLUTION
	2018-05-01
卷号	236 页码:672-679
关键词	Organoiodine compounds (OICs) Manganese oxide (delta-MnO2) Dissolved organic matter (DOM) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS)
ISSN号	0269-7491
文献子类	Article
英文摘要	Iodination of dissolved organic matter (DOM) initiated by manganese oxide may represent an important source of organoiodine compounds (OICs) for iodide-containing waters. Here, Suwannee River natural organic matter was selected as model DOM, the OICs formation in simulated freshwater samples from iodinated DOM induced by manganese oxide (delta-MnO2) was investigated at different pHs and concentrations of iodide and delta-MnO2 by using negative ion electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR MS). While no OIC was observed in DOM control samples without delta-MnO2, hundreds of OICs were detected in the presence of delta-MnO2, suggesting the enhanced role of delta-MnO2 played in DOM iodination. The relative abundance was defined as the value of dividing the peak intensity of OICs by the highest m/z peak intensity constantly occurred in each mass spectrum, and selected as a parameter for partly reflecting the real level of OICs. The relative abundance of most OICs were around or greater than 1%, and several OICs with higher relative abundance were identified as diiodo-5-hydroxy-4-cyclopentene-1,3-dione, diiodomethane and diiodoacetic acid. The numbers of the formed OICs increased with the increase concentrations of iodide/delta-MnO2 and the decrease of pH, and nearly all OICs formed at lower levels of iodide/delta-MnO2 and/or higher pH were overlapped by that at higher levels of iodide/delta-MnO2 and/or lower pH, indicating the reliability of FT-ICR MS analysis techniques and data processing method. The OICs were formed mainly from the iodination of typical lignin-like and tannin-like compounds, as well as the precursor compounds with higher relative abundance through substitution reactions. Our findings demonstrate that the OICs formation by delta-MnO2-initiated DOM iodination should receive more attention and the concentration, exact structure and toxicity of the OICs need to be further investigated. (C) 2018 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40867]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Hao, Zhineng,Wang, Juan,Yin, Yongguang,et al. Abiotic formation of organoiodine compounds by manganese dioxide induced iodination of dissolved organic matter[J]. ENVIRONMENTAL POLLUTION,2018,236:672-679.
APA	Hao, Zhineng,Wang, Juan,Yin, Yongguang,Cao, Dong,&Liu, Jingfu.(2018).Abiotic formation of organoiodine compounds by manganese dioxide induced iodination of dissolved organic matter.ENVIRONMENTAL POLLUTION,236,672-679.
MLA	Hao, Zhineng,et al."Abiotic formation of organoiodine compounds by manganese dioxide induced iodination of dissolved organic matter".ENVIRONMENTAL POLLUTION 236(2018):672-679.