【摘要】 为识别黑臭水体中DOM组成、结构及腐殖化水平,运用UV-vis（紫外-可见吸收光谱）与多元统计相结合的方式,对沈阳市5条黑臭水体的27个表层水样中DOM的UV-vis特征及9个紫外光谱指数进行研究。研究表明:27个表层水样中DOM的UV-vis吸收系数的变异系数在30%～80%之间,轻度黑臭水体相对于重度黑臭水体的紫外吸收峰在356、487、657 nm处分别发生了1、2、2 nm的蓝移;轻度黑臭水体紫外光谱指数SUVA₂₅₄、S_275～295、S_350～400、A₂/A₁、A₃/A₁、A₃/A₂均高于重度黑臭水体,而E₂/E₃、E₄/E₆、E₂/E₄低于重度黑臭水体,轻度黑臭水体的腐殖化水平与腐殖化趋势高于重度黑臭水体。进一步分析得出:苯酚基（木质素和奎宁基团）决定了黑臭水体中DOM腐殖化进程,不同黑臭水体DOM的组分存在明显差异;轻度黑臭水体中DOM的腐殖化水平、芳香化程度、木质素与其他物质在腐殖化开始的比例、分子质量等均高于重度黑臭水体。多元统计与UV-vis技术对黑臭水体中DOM的组成及结构进行了定性,为黑臭水体的溯源和整治工作提供理论基础。更多还原

【Abstract】 In order to identify the composition, structure and humification level of DOM in black and odorous water body, the ultraviolet absorption spectra and nine ultraviolet spectral indices of DOM in 27 surface water samples of five black and odorous water bodies in Shenyang city were studied by using the combination of ultraviolet-visible absorption spectroscopy and statistical analysis techniques. The results showed that the variation coefficients of DOM ultraviolet spectral absorption indices of 27 surface water samples ranged from30% to 80%, and the ultraviolet absorption peaks of mild black and odorous water bodies at 356, 487 and 657 nm showed blue shifts of 1, 2 and 2 nm, respectively. The ultraviolet spectral indices of mild black and odorous water bodies, such as SUVA₂₅₄、S_275～295、S_350～400、A₂/A₁、A₃/A₁、A₃/A₂, were higher than those of severe black and odorous water bodies, while E₂/E₃, E₄/E₆ and E₂/E₄ were lower than those of severe black and odorous water bodies, and the humification level and trend of mild black and odorous water bodies were higher than those of severe black and odorous water bodies. The further results showed that phenol group（lignin and quinine group）determined the humification process of DOM in black and odorous water body. There are obvious differences in DOM components among different black and odorous water bodies. The humification level, aromatization degree,ratio of lignin to other substances and molecular weight of DOM in mild black and odorous water body were higher than those in severe black and odorous water body. Multivariate statistics and UV-vis technology were used to qualitatively characterize the structure of DOM in black and odorous water body, which provided a basis for the traceability and treatment of black and odorous water body.更多还原