| 多元数理统计法研究太子河本溪城市段水体DOM紫外光谱特征 |
| 摘要点击 3521 全文点击 1646 投稿时间：2016-01-25 修订日期：2016-05-04 |
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| 中文关键词 水溶性有机物 空间分布 紫外光谱 多元统计 主成分分析 |
| 英文关键词 dissolved organic matter spatial distribution UV-VIS spectroscopy multivariable analysis principal component analysis |
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| 中文摘要 |
| 在太子河本溪城市段7个点位采集表层水样，应用多元数理统计法研究其DOM的来源、组成、结构及腐殖化水平. 推导出9个紫外光谱指数（SUVA254、E2/E3、E2/E4、E4/E6、S275~295、S350~400、A2/A1、A3/A1和A3/A2）用于研究DOM的组成与结构特征，进一步评估DOM的腐殖化水平. 研究表明：太子河本溪城市段水体中DOM的腐殖化程度呈现城市河段及工业废水排放分布特征，本溪钢铁厂排放废水所含的DOM为聚合程度低且相对分子质量较小的有机物；E2/E3与E2/E4呈现极显著性正相关（P<0.01），与S275~295、S350~400和A2/A1呈显著负相关（P<0.05），表明太子河本溪城市段水体DOM腐化程度不仅与有机物分子缩合度有关，同时与富里酸和胡敏酸比值密切相关；DOM组成结构特征与A2/A1、SUVA254和S275~295呈显著正相关，而与E2/E3和E2/E4呈显著负相关；得分图显示7个采样点分别位于3个35%置信度的椭圆内，进一步验证太子河本溪城市段水体中DOM组成与结构、腐殖化水平呈现城市河段及工业废水排放分布特征，表明太子河本溪城市段DOM深受人类活动的影响. |
| 英文摘要 |
| This study investigated the ability of ultra violet-visible (UV-Visible) spectroscopy to analyze the origin,compositions,structure and humification level of dissolved organic matter(DOM). Seven surface water samples were collected from the Benxi City section of mainstream in Taizi River. Nine indices (SUVA254, E2/E3, E2/E4, E4/E6, S275-295, S350-400, A2/A1, A3/A1 and A3/A2), deduced from elemental analysis and UV visible spectroscopy of DOM, were used to assess the humification degree. The results showed that the characteristics of DOM were distributed along urban river and industrial wastewater discharge, and the DOM of waste water from Benxi steel plant contained a low degree of condensation of small organic molecules. E2/E3 showed positive correlation with E2/E4, and negative correlations with S275-295, S350-400, A2/A1,indicating that humification degree of DOM was not only concerned with the degree of condensation of organic molecules, but also closely associated with the ratio between humic acid and fulvic acid. Composition structure of DOM showed significant positive correlations with A2/A1, SUVA254 and S275-295, and significant negative correlations with E2/E3 and E2/E4. Based on the loadings of DOM component and scores plot of sampling sites in Taizi River (Benxi City section),the characteristics of DOM were distinctly distributed along urban river and industrial wastewater discharge, proving that the river was deeply influenced by human activity. |
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