本文選題：溶解性有機(jī)物 + 泥沙沉降��； 參考：《遼寧大學(xué)》2017年碩士論文

【摘要】：為了研究泥沙沉降過(guò)程對(duì)水體中溶解性有機(jī)物的影響,本實(shí)驗(yàn)以遼寧省沈陽(yáng)市新開(kāi)河為研究對(duì)象,考察了泥沙沉降過(guò)程中,沉降時(shí)間、泥沙含量、pH、鹽度等因素對(duì)水體中溶解性有機(jī)碳(DOC)濃度和水體中溶解性有機(jī)物的光譜學(xué)特性的影響。實(shí)驗(yàn)結(jié)果表明,在泥沙沉降過(guò)程中,不同的影響因素均會(huì)對(duì)水體中DOC產(chǎn)生影響。在泥沙沉降的初始階段,可溶性的腐殖酸與疏水性有機(jī)物結(jié)合,使水體中可溶性有機(jī)物的含量增加。隨著泥沙沉降時(shí)間的增長(zhǎng),泥沙對(duì)水體中有機(jī)物的吸附量增加,DOC含量呈現(xiàn)先上升后下降的變化。隨著泥沙含量的增加,取樣口處水樣的DOC含量呈現(xiàn)先下降后上升的趨勢(shì)。隨著pH值的增大,溶解性有機(jī)碳的酸性官能團(tuán)羧基和酚羥基的解離會(huì)使其所帶的負(fù)電荷增多,同時(shí)水體中OH-含量不斷增加,使得DOC在水體中排斥力增強(qiáng),不利于帶負(fù)電荷的顆粒泥沙對(duì)DOC進(jìn)行吸附。鹽度的增加,會(huì)使水樣中DOC含量逐漸減小,且下層水體DOC含量受鹽度影響要高于上層水體。隨著沉降時(shí)間的增加,水樣的UV-254呈現(xiàn)出先增大后減小的趨勢(shì),SUVA呈先增大后逐漸平衡的狀態(tài),水體中芳香性物質(zhì)含量逐漸達(dá)到平衡狀態(tài)。隨著泥沙含量的增加,水樣UV-254均表現(xiàn)為先減小后增大,這與相同條件下DOC的變化趨勢(shì)一致。SUVA先增大后減小,說(shuō)明水中芳香性有機(jī)物的含量先增多后減少。pH值增大,UV-254和SUVA也逐漸增大,并且下層水體的UV-254受酸堿度的影響要大于上層水體。一定鹽度范圍內(nèi),隨著鹽度的增大,A、B兩取樣口處水樣的UV-254和SUVA逐漸減小,說(shuō)明水體中芳香性物質(zhì)在逐漸減少,同時(shí)水體中DOM分子量不斷減小。三維熒光光譜圖表明,不同的影響因素下,泥沙沉降后的水體中所含有的熒光峰主要為類(lèi)腐殖酸熒光峰和類(lèi)富里酸熒光峰,還有兩個(gè)以“峰肩”形式存在的熒光峰,為類(lèi)溶解性微生物代謝產(chǎn)物熒光峰和類(lèi)芳香族蛋白質(zhì)熒光峰。同步熒光光譜圖表明,不同的影響因素下,泥沙沉降后的水體中可以看到兩個(gè)明顯的特征峰,分別是激發(fā)波長(zhǎng)為280~300nm和330~350nm的熒光物質(zhì),兩熒光峰位于類(lèi)溶解性微生物代謝產(chǎn)物熒光區(qū)和類(lèi)腐殖酸熒光區(qū)。
[Abstract]:In order to study the effect of sediment sedimentation process on dissolved organic matter in water body, this experiment took Xinkai River, Shenyang City, Liaoning Province as the research object, and investigated the settling time in the process of sediment sedimentation. The effects of pH and salinity on the concentration of dissolved organic carbon (DOC) and the spectral characteristics of dissolved organic matter in water were studied. The experimental results show that DOC in water is affected by different factors in the process of sediment sedimentation. In the initial stage of sediment deposition, soluble humic acid combined with hydrophobic organic compounds increased the content of soluble organic matter in water. With the increase of sedimentation time, the amount of organic matter adsorbed by sediment increased and the content of DOC increased first and then decreased. With the increase of sediment content, the DOC content of the water sample at the sampling port decreased first and then increased. With the increase of pH value, the dissociation of carboxyl groups and phenolic hydroxyl groups of dissolved organic carbon will increase the negative charge, and the content of OH- in water will increase continuously, which makes the repulsion of DOC in water enhanced. It is unfavorable for the negatively charged particles to adsorb DOC. With the increase of salinity, the content of DOC in the water will gradually decrease, and the content of DOC in the lower water will be more affected by salinity than that in the upper water. With the increase of sedimentation time, the UV-254 of water samples increased first and then decreased, and the content of aromatic substances in water gradually reached equilibrium. With the increase of sediment content, the UV-254 of water samples decreased first and then increased, which was consistent with the change trend of DOC under the same conditions. The results showed that the content of aromatic organic matter in water increased at first and then decreased. The increase of pH value and the increase of UV-254 and SUVA also increased gradually, and the UV-254 of the lower water was more affected by pH than that of the upper water. In a certain range of salinity, the UV-254 and SUVA of water samples decreased with the increase of salinity, indicating that the aromatic substances in water gradually decreased and the molecular weight of DOM in water decreased. Three-dimensional fluorescence spectra showed that the fluorescence peaks in the sediment subsidence water were mainly humic acid-like fluorescence peaks and similar fulvic acid-like fluorescence peaks, and there were two fluorescence peaks in the form of "peak shoulder". It is the fluorescence peak of metabolites of dissolvable microorganisms and aromatic proteins. The synchronous fluorescence spectra show that two distinct characteristic peaks can be seen in the water after sediment deposition under different influence factors, namely, the excitation wavelength of 280~300nm and the fluorescence of 330~350nm. The two fluorescence peaks were located in the fluorescence region of metabolites of dissolved microorganisms and the fluorescence region of humic acid.
【學(xué)位授予單位】：遼寧大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X52;TV142.1

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本文編號(hào)：1922820