title: [Study on the characteristic UV absorption parameters of dissolved organic matter extracted from chicken manure during composting].
abstract: The characteristic parameters obtained from UV-Visible spectra of dissolved organic matter (DOM) during composting were studied in the present paper. The results showed that, during composting progress, the non-humic substances were translated into humus substances, and the aromatization, humification degree and molecular weight of the humus substances increased, while the fatty chains linked with the benzene ring structure were cleavaged into carbonyl, carboxyl and other functional groups. The correlation analysis showed that, when DOM concentration (DOC) from all samples was the same, the specific ultraviolet absorbance values at 254 and 280 nm (SUVA254 and SUVA280, respectively), and the area of a spectrum obtained from 226 to 400 nm (A(226-400)) showed significant positive correlation, furthermore, they were all significantly negatively correlated with the concentration of DOM (DOC), but the correlation between A(226-400) and DOC was the best; The ratio between the absorbance value at 253 nm and that at 203 nm (E253/E203) was significantly correlative with SUVA254, SUVA280 and A 226-400, though the correlation between E253/E203 and DOC was not as good as the other three characteristic parameters; The ratio between the absorbance value at 250 nm and that at 365 nm (E250/E365) and the ratio between the absorbance value at 465 nm and that at 665 nm(E250/E365) were not correlated with the other parameters. The results showed that, the stability of DOM extracted from chicken manure increased during composting, and the complex ability between DOM and heavy metals enhanced as well; A(226-400) reflects the changes of compost maturity best in all UV-Visible spectral absorption parameters studied in this paper.
authors.affiliation: Northeast Agricultural University, Harbin 150030, China. limingxiao8122@163.com
authors.forename: Ming-xiao
authors.initials: MX
authors.lastname: Li
authors.forename: Xiao-song
authors.initials: XS
authors.lastname: He
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: Bei-dou
authors.initials: BD
authors.lastname: Xi
authors.forename: Yue
authors.initials: Y
authors.lastname: Zhao
authors.forename: Zi-min
authors.initials: ZM
authors.lastname: Wei
authors.forename: Yong-hai
authors.initials: YH
authors.lastname: Jiang
authors.forename: Jing
authors.initials: J
authors.lastname: Su
authors.forename: Chun-ming
authors.initials: CM
authors.lastname: Hu
mesh_terms: D000818:Animals; D002645:Chickens; D006812:Humic Substances; D008372:Manure; D019216:Metals, Heavy; D008970:Molecular Weight; D009930:Organic Chemicals; D012987:Soil / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D006812:Humic Substances; D008372:Manure; D019216:Metals, Heavy; D009930:Organic Chemicals; D012987:Soil