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研究了锦州湾沉积物中正构烷烃的含量、组成特征、特征比值及其来源.采集18个站位的表层沉积物样品,经正己烷/二氯甲烷(体积比1∶1)混合液索氏提取、净化浓缩后进行GC-MS分析.结果表明,正构烷烃含量(Σn-Alk)范围1.9～4.2μg.g-1,平均值2.6μg.g-1,各个站位组成特征相似,都表现为双峰型,显示了陆源与海源双重贡献特征.ΣC25～31贡献值为20%～32%,短/长链比值L/H均值为0.67,C31/C19均值3.06,类脂物比值TAR均值为2.02,3个参数显示锦州湾沉积物外来源陆源贡献值要大于海洋源,特别是2、3和7站位受到陆源河流输入影响较大.碳优势指数CPI范围1.19～2.63,均值1.73,接近于1;姥鲛烷和植烷比值Pr/Ph为0.91～1.28;样品中普遍存在不可分离化合物UCM,U/R比值为2.2～4.3,此3个参数显示出13和15站位有石油输入特征.多种特征参数比值综合分析表明该海域受到了陆源输入和石油烃污染的威胁,这可能与锦州湾地区河流排污、港口航运有关.
The content of n-alkanes in sediments of Jinzhou Bay, the compositional characteristics, the characteristic ratios and their sources were studied.The samples of surface sediments from 18 stations were collected and mixed with soxhlet in dichloromethane / n-hexane (1: 1 by volume) The results showed that n-alkane content (Σn-Alk) ranged from 1.9 to 4.2μg.g-1 with an average value of 2.6μg.g-1, and the composition of each station was similar Showing the dual contribution of terrigenous and marine sources.The contribution of ΣC25-31 was 20% -32%, the ratio of short / long chain L / H was 0.67, the average of C31 / C19 was 3.06, the ratio of lipids TAR The average of 2.02 shows that the contributions of terrestrial sources of sediments in Jinzhou Bay are greater than those of marine sources, especially in stations 2, 3 and 7. The CPI of carbon dominance index ranges from 1.19 to 2.63, with a mean of 1.73 , Which is close to 1. The Pr / Ph ratio of pristane to phytane is 0.91 ~ 1.28. UCM, U / R ratio, is 2.2 ~ 4.3. The three parameters are 13 and 15 Petroleum input characteristics A comprehensive analysis of the ratios of various characteristic parameters indicates that the area is threatened by terrestrial input and petroleum hydrocarbon contamination, And rivers of sewage, port and shipping related Jinzhou Bay area.