牛粪发酵沼液DOM与Fe (III)离子络合机制研究

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Abstract In this work, the binding heterogeneities and mechanism of Fe(III) with digestate dissolved organic matter (DOM) derived from anaerobic fermentation of cow manure was investigated through fluorescence spectra, Fourier Transform Infrared spectroscopy (FTIR), parallel factor analysis (PARAFAC) and two-dimensional correlation spectroscopy (2D-COS). The results showed that six fluorescent components, including protein-like (C2), fulvic-like (C1), humic-like (C4 and C5), a combination of protein-like and fulvic-like (C3), a combination of protein-like and humic-like (C6) could be identified by PARAFAC model. However, only protein-like and fulvic-like components could be identified by 2D-SYS-COS, and protein-like were dominant fluorescent component in DOM. 2D-COS analysis revealed that fulvic-like substances showed a preferential affinity with Fe(III) at 334nm, and the preferential bonding followed the order:334nm→306nm. The −NH₂ group of secondary ammonium could preferentially combine with Fe(III), and the preferential binding of Fe(III) to the digestate DOM followed the order:2265→2771→1528→1310→1805→ 1479cm^-1. The results of double log equation indicated that highly chemically stable DOM-Fe(III) complexes could be formed, whose logarithmic conditional stability ranged from 4.34 to 7.03. The work herein could provide a theoretical guide for the species distribution, migration and transformation of metal ions when digestate was applied to soils.

Key words： digestate DOM complexation parallel factor analysis two-dimensional correlation spectroscopy

Received: 16 July 2020

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X705

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	Articles by authors
	LIU Yu-dan
	XIE Xin
	XIE Li-hong
	TIAN Yuan-yuan
	YANG Meng
	GUO Xu-jing

Cite this article:

LIU Yu-dan,XIE Xin,XIE Li-hong等. Investigation of binding mechanism of Fe(III) with digestate DOM derived from anaerobic fermentation of cow manure[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 771-777.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/771

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