本文選題：沉積物-海水界面　切入點：溶解氧與pH值　出處：《中國海洋大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：沉積物—水界面是生物地球化學(xué)循環(huán)的主要界面，掌握界面附近溶解氧(Dissolved Oxygen, DO)與pH值動態(tài)分布變化對了解界面化學(xué)物質(zhì)變化對生物地球化學(xué)循環(huán)過程的影響有著重要意義。鑒于微電極溶解氧與pH值測量方法在獲取界面剖面兩維信息具有一定的局限性，20世紀(jì)70年代新興的平面光學(xué)傳感器可以實時記錄兩維空間的沉積物-水界面化學(xué)態(tài)變化過程，為揭示沉積物—海水界面的生物與化學(xué)環(huán)境變化以及生物棲息地的變化過程提供了一種有效的觀測手段。 本文探討了基于光強(qiáng)比率的溶解氧測量方法，制備了基于八乙基卟啉鉑和香豆素的平面光學(xué)傳感膜，構(gòu)建了沉積物-水界面原位模擬試驗系統(tǒng)，開展了沉降在海底的水母消亡過程對沉積物-海水界面溶解氧的時空變化影響應(yīng)用研究，實驗結(jié)果表明沉降在海底的水母第1天內(nèi)，沉積物-海水界面的溶解氧消耗速率為0.2mg/L h-1，第2天溶解氧的消耗速率為0.04mg/L h-1。在近海底的水體空間內(nèi)，第1天的溶解氧消耗速率為0.28mg/L h-1，第2天為0.14mg/L h-1，第3天為0.13mg/L h-1，，證明水母在消亡過程中的3-4天內(nèi)可在沉積物-海水界面附近形成一個貧氧區(qū)，水母消亡過程改變了海底區(qū)域的溶解氧分布體系，因此水母爆發(fā)后的消亡期可導(dǎo)致海底大面積嚴(yán)重缺氧，對底棲生態(tài)系統(tǒng)產(chǎn)生重大影響。 針對前期pH值平面光極所采用的，8-羥基芘-1,3,6-三磺酸鹽（8-Hydroxypyrene-1,3,6-tri-sulfonic, trisodium salt, HPTS）熒光指示劑由于其自身的親水性，容易引起熒光指示劑泄露的問題，利用化學(xué)修飾方法合成了改性HPTS-TOA親脂性熒光指示劑，制備了基于親脂性HPT-TOAS和香豆素的比率法平面?zhèn)鞲心ぃY(jié)合3CCD相機(jī)直接記錄R\G\B光譜構(gòu)建了不需要多組濾光片的實用性強(qiáng)的平面光學(xué)pH值觀測系統(tǒng)，簡化了傳統(tǒng)的雙激勵光源，雙激發(fā)光記錄的繁瑣步驟，為構(gòu)建實用化的原位觀測系統(tǒng)奠定了基礎(chǔ)。
[Abstract]:The interface between sediment and water is the main interface of biogeochemical cycle. It is important to understand the influence of the change of interfacial chemical substances on the biogeochemical cycling process by grasping the dynamic distribution of dissolved oxygen (DO) and pH value near the interface. The two-dimensional information of interface profile has some limitations. In 70s, the new planar optical sensor can record the chemical state change process of sediment water interface in two dimensional space in real time. It provides an effective observation method for revealing the changes of biological and chemical environment and the process of biological habitat change in the interface between sediment and seawater. In this paper, the method of measuring dissolved oxygen based on light intensity ratio is discussed. A planar optical sensing film based on octaethyl porphyrin platinum and coumarin is prepared, and an in situ simulation test system for sediment-water interface is constructed. The effects of sedimentation on the temporal and spatial variation of dissolved oxygen at the interface between sediment and seawater were studied. The experimental results showed that the sedimentation occurred in the first day of the sea bottom jellyfish. The dissolved oxygen consumption rate at the interface between sediment and seawater is 0.2 mg / L h-1 and 0.04 mg / L h-1 on the second day. The dissolved oxygen consumption rate was 0.28 mg / L h-1 on the first day, 0.14 mg / L h-1 on the second day, and 0.13 mg / L h-1 on the third day. The extinction process of jellyfish changes the distribution system of dissolved oxygen in the seabed area, so the extinction period of jellyfish after the eruption can lead to severe hypoxia in a large area of the sea bottom and have a significant impact on the benthic ecosystem. In view of the fluorescence indicator of 8-hydroxypyrene-1sulfonate (8-Hydroxypyrene-1), 6-tri-sulfonic, trisodium salt (HPTSs), which is used in the plane photoelectrode of pH value, it is easy to cause the leakage of the fluorescent indicator because of its hydrophilicity. The modified HPTS-TOA lipophilic fluorescent indicator was synthesized by chemical modification, and the specific method plane sensing film based on lipophilic HPT-TOAS and coumarin was prepared. Combined with 3CCD camera to record R\ G\ B spectrum directly, a plane optical pH observation system without the need of multiple filters is constructed, which simplifies the complicated steps of traditional double excitation light source and double excitation light recording. It lays a foundation for the construction of practical in-situ observation system.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P736.21

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本文編號：1582017