Department of Chemical Sciences, Redeemer's University, Klm 46/48 Lagos-Ibadan Express Way, Nigeria.
Sci Total Environ. 2012 Dec 15;441:89-96. doi: 10.1016/j.scitotenv.2012.09.015. Epub 2012 Nov 6.
The occurrence of sterols and n-alkanes in surface sediments from rivers and canals in the Niger Delta, Nigeria, determined with a gas chromatography-mass spectrometry method, was used to assess the impacts of anthropogenic activities in the area. The concentrations of total sterols (∑₈Sterol) and n-alkanes (∑₂₈n-alkane) in the sediments ranged from 133 to 2040 ng/g and 474 to 79,200 ng/g, respectively. An evaluation of the source diagnostic indices indicated that petroleum related sources (petrogenic) were the main contributor of n-alkanes in the samples, with minor contribution from higher plants waxes (biogenic), while the sterols were mainly of biogenic origin. The ratio of α-cholestanone/(α-cholestanone+β-cholestanone), a commonly used source diagnostic index, implicated no fecal contamination in most of the sediment samples under investigation. These results have established the occurrence of anthropogenic contamination in Niger Delta sediments with significant contributions from petrogenic sources.
使用气相色谱-质谱法测定了尼日利亚尼日尔三角洲河流和运河表层沉积物中甾醇和正构烷烃的含量，以此评估该地区人为活动的影响。沉积物中总甾醇（∑₈Sterol）和正构烷烃（∑₂₈n-alkane）的浓度范围分别为 133-2040ng/g 和 474-79200ng/g。来源诊断指数的评估表明，石油相关源（源自石油）是样品中正构烷烃的主要来源，其次是高等植物蜡（源自生物），而甾醇主要源自生物。常用的来源诊断指数α-胆甾烷酮/(α-胆甾烷酮+β-胆甾烷酮)比值表明，在所研究的大部分沉积物样本中，没有粪便污染。这些结果表明，尼日尔三角洲沉积物中存在人为污染，且主要源自石油源。
