【摘要】：甲基硅氧烷是以硅氧(Si-O)鍵為主鍵,硅原子上直接連接甲基基團的有機硅化合物,具有鏈狀和環(huán)狀兩類結(jié)構(gòu)(分別以L。和D。表示,n表示化合物分子中Si原子的個數(shù)),廣泛應用于人們的日常生活用品中。研究表明甲基硅氧烷可能具有持久性、生物富集性及生物毒性,因而被列為潛在的持久性有毒物質(zhì),受到廣泛關(guān)注,但是,已有研究結(jié)果對甲基硅氧烷是否存在生物放大效應存在爭議。帶著上述問題,本論文以大連灣海域為研究區(qū)域,利用穩(wěn)定氮和碳同位素分析了主要生物間的營養(yǎng)關(guān)系,建立不同生物種類體內(nèi)受試化合物脂肪當量濃度與營養(yǎng)級之間的線性回歸模型,分析受試化合物在海洋食物網(wǎng)中的生物放大效應。結(jié)果表明,D5在不同物種內(nèi)的脂肪當量濃度與營養(yǎng)級水平之間具有極顯著的正相關(guān)關(guān)系(R=0.44,p0.0001),證明其在所研究的食物網(wǎng)中存在潛在的生物放大效應。利用建立的回歸模型,通過計算得到D5的營養(yǎng)級放大系數(shù)(TMF)為1.77,統(tǒng)計分析得到95%置信區(qū)間的(95%CI)取值范圍是1.41-2.24,利用10000次的蒙特-卡洛模擬得到D5的TMF1的概率為99.8%(TMF1說明營養(yǎng)級放大效應存在)。類似的脂肪當量濃度與營養(yǎng)級水平之間正相關(guān)關(guān)系對于D4、D6和D7三種化合物并不顯著(D4：R=0.14,p=0.16；D6：R=0.01,p=0.92；D7：R=-0.15,p=0.12)。利用相同的方法計算得到D4的TMF為1.16(95%CI: 0.94-1.44；TMF1的概率是94.7%)；D6的TMF為1.01(95%CI：0.84-1.22；TMF1的概率是66.9%)；D7的TMF為0.85(95%CI：0.69-1.04,；TMF1的概率是48.6%)。此外,本研究以一種被證明具有顯著生物放大效應的化合物：2,2’,4,4’,5-五溴聯(lián)苯醚(BDE-99)作為基準化合物,進行比較研究。結(jié)果表明,BDE-99在不同物種內(nèi)的脂肪當量濃度與營養(yǎng)級水平之間具有極顯著的正相關(guān)關(guān)系(R=0.65,p0.0001),計算得到其TMF值為3.27(95%CI：2.49-4.30；TMF1的概率是99.7%)。
[Abstract]:Methyl siloxane is an organosilicon compound with Si-O bond as the main bond and methyl group directly connected to the silicon atom. It has two kinds of structure, i.e., chain structure and ring structure (L, L). And D. N denotes the number of Si atoms in compound molecules, which is widely used in people's daily necessities. Studies have shown that methylsiloxane may be persistent, bioenriched and biologically toxic and is classified as a potentially persistent toxic substance that is of wide concern, however, There is controversy about the biomagnification effect of methylsiloxane. With the above problems in mind, the nutrient relationships among the main organisms were analyzed by using stable nitrogen and carbon isotopes in Dalian Bay as the study area. A linear regression model between fat equivalent concentration and nutrient level of tested compounds in different biological species was established and the biomagnification effects of tested compounds in marine food webs were analyzed. The results showed that there was a very significant positive correlation between the fat equivalent concentration of D5 in different species and the nutrient level (R = 0.44, p 0.0001), which indicated that D5 had potential biomagnification effect in the food webs studied. Using the established regression model, the trophic magnification factor (TMF) of D5 is calculated to be 1.77, and the range of 95% confidence interval (95%CI) is 1.41 to 2.24, by statistical analysis. The probability of obtaining TMF1 of D5 from 10000 Monte-Carlo simulations is 99.8% (TMF1 indicates the existence of nutrient-level amplification effect). A positive correlation between similar fat equivalent concentration and nutrient level was not significant for D4, D6 and D7 compounds (D4R0.14, p16D6 / R0.01, p = 0.92D7 / R = 0.15, p = 0.12), and there was no significant correlation between D4, D6 and D7 (D4R = 0.14, p = 0.16 / D6 / R = 0.01, p = 0.92d7 / R = 0.15, p = 0.12). Using the same method, the TMF of D4 was 1.16 (95% CI: 0.94%), and the TMF of D6 was 1.01 (95% CI 0.84? 1.22? TMF1 was 66.9%), and the TMF of D6 was 1.01 (95% CI: 0.94? 1.44? TMF1 was 94.7%), while that of D6 was 1.01 (95% CI: 0.94? 1.44). The TMF of D7 is 0.85 (95% CI / 0.69? 1.04, the probability of TMF1 is 48.6%). In addition, a reference compound, 2,2, 4, 4, 5-pentabromobiphenyl ether (BDE-99), was used as a reference compound in this study, which proved to have significant biomagnification effects. The results showed that there was a significant positive correlation between the fat equivalent concentration of BDE-99 in different species and the nutrient level (R = 0.65, p 0.0001), and the TM value was 3.27 (95% CI = 2.49 / 4.30). The probability of TMF1 is 99.7%.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X171.5

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相關(guān)期刊論文 前1條

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本文編號：2459339