河川底泥中壬基酚在不同pH值與黃酸及腐植酸之相互反應

Reactions of Fulvic Acid and Humic Acid with Nonyphenol in River Sediment at Different pH

孫浩倫(HAO-LUN SUN)

指導教授 ： 張簡水紋

朝陽科技大學/理工學院/環境工程與管理系/碩士(2016年)

摘要

壬基酚 (nonylphenol, NP)在環境中無所不在，因結構式與雌性激素類似，進入人體後會導致人體雌激素被取代，進而影響人體健康，則壬基酚 (NP)具有高潛勢力之生物內分泌干擾物質，被稱之為環境荷爾蒙。壬基酚 (NP)屬於疏水性 (hydrophobicity)有機污染物 (log Kow=4.48)，易與底泥中腐植化物質 (humic substance, HS)產生鍵結，尤其是水溶性腐植酸 (humic acid, HA)及黃酸 (fulvic acid, FA)。本研究添加壬基酚 (NP) 於底泥中，在利用0.1 M HCL及0.1 M NaOH調節其pH值為4.00、7.00、9.00，再分別添加0.5%之腐植酸 (HA) 及黃酸 (FA)。於室溫下測定反應系統中壬基酚 (NP) 腐植酸 (HA) 與黃酸 (FA)及的吸附鍵結反應。以動力學在不同pH值下，探討水體中pH值不同是否會導致底泥中有機質吸附效果及釋出率是否會受到影響。

　　由研究指出，底泥對壬基酚 (NP)的吸附效果在0-10天為最快，15-20天時趨近於平緩，則有添加腐植化物質 (HS)的處理組，吸附效果比未添加腐植化物質來的好，則又以添加黃酸 (FA)時吸附效果為最佳；調整pH值部分，以pH值為9.00時，能助於吸附壬基酚 (NP)，顯示出底泥在鹼性條件下能有助於吸附較多的壬基酚 (NP)。整體吸附曲線，偏向於二階的動力學反應，表示反應速率與壬基酚 (NP)濃度的平方成正比。則熱力學較符合Freundlich及Dubinin-Radushkevich兩條等溫吸附模式，說明此吸附模式屬多層吸附及物理性之吸附。因此，河川環境中在鹼性條件下且含較高的腐植化物質 (HS)，能使壬基酚 (NP)的釋出率較低。

關鍵字

壬基酚 ； 腐植化物質 ； 腐植酸 ； 黃酸 ； 動力學 ； 熱力學

並列摘要

Nonylphenol (NP) is ubiquitous in environment. In human body, it substitutes female estrogen with easy for the structural similarity and damage human health. NP is a potent biological endocrine disrupting chemical, an environmental hormone. Being a hydrophobic organic compound (log Kow =4.48), it bonds easily with sediment humic substances, especially water-soluble humic acid and fulvic acid. This study mixes in NP in the stream sediment, which is adjusted with 0.1 M HCL and 0.1 M NaOH for pH to 4.00, 7.00 and 9.00, then, adds in 0.5% humic acid and fulvic acid respectively for each test sample of pH level. Under room temperature, the experiment is to determine the bonding forms and adsorption between NP and two acids. The experiment aims to explore the pH as a possible master variable affecting the reaction kinetics and the equilibrium in adsorption and releasing of NP.

Experiment shows sediment adsorbs NP rapidly in period 0-10 days then taps off to flat in 15-20 days. Addition of humic substance, especially fluvic acis, enhances the adsorption ability. For the pH adjustment, the data at pH 9 is in the lead, implying basic condition is preferred in the entire system. Overall adsorption curve is biased in favor of second-order kinetics, exhibiting the reaction rate is proportional to the square of the NP concentration. This study concludes that a river environment under basic condition and high level of humic substance is capable to retain NP and release little of it.

並列關鍵字

Nonylphenol ； Humic Substance ； Humic Acid ； Fulvic Acid ； Dynamics ； Thermodynamics

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