Data of Petroleum Hydrocarbon Concentration across Woji Creek in Rivers State, Nigeria

A weekly sampling of water and sediment was carried out for four months (June- September). Samples of surface water were collected in a well- labelled 1000 ml volume glass container and placed in a cooler at a temperature of 4 ºC, while sediment samples were collected in Ziploc bags at a penetration depth of 5 cm using a trowel. Samples of water and sediment collected were a composite sample from five points identified in each station (Patil, 2002).
Compounds were extracted with anhydrous sodium sulphate, dichloromethane (DCM) and hexane (Ratio 1:1) and activated silica gel accordingly to the methodology described in Ilavsk and Hriv (2004) and USEPA (1999). The analysis of hydrocarbon concentrations (Table 1S) in samples extracts was performed using an Agilent 7890A Gas Chromatograph according to EPA 8015 – GC/FID (Ilavsk and Hriv, 2004; USEPA, 1999).

Ilavsk, J., Hriv, J., 2004. Determination of Petroleum Hydrocarbons in Water by Microextraction and Capillary Gas Chromatography. Slovak Journal of Civil Engineering l, 13–17.
Lloyd-Roberts, S., 2009. Fighting for Nigeria’s oil wealth [WWW Document]. BBC Two. URL http://news.bbc.co.uk/2/hi/programmes/newsnight/7816654.stm (accessed 12.29.19).
Patil, G.P., 2002. Composite Sampling, in: El-Shaarawi, A.H., Piegorsch, W.W. (Eds.), Encyclopedia of Environmetrics. John Wiley & Sons, Ltd, Chichester, pp. 387–391. https://doi.org/10.2307/2529498
USEPA, 1999. Method 1664, Revision A: n-Hexane extractable material (HEM; oil and grease) and silica gel treated n-hexane extractable material (SGTHEM; non-polar material) by extraction and gravimetry. Washington, DC.

为期四个月的每周水样和沉积物采样工作于六月至九月期间进行。水面水样被收集于标有标签的1000毫升容量玻璃容器中，并置于4摄氏度的冷却器中保存，而沉积物样品则使用铁锹在5厘米的穿透深度处收集于Ziploc袋中。所采集的水和沉积物样品为每个站点（帕蒂尔，2002年）中确定的五个点的混合样本。
化合物通过无水硫酸钠、二氯甲烷（DCM）和己烷（比例1:1）提取，并按照伊拉夫斯克和赫里夫（2004年）以及USEPA（1999年）所述的方法激活硅胶。
水样提取物中烃类浓度的分析（表1S）使用安捷伦7890A气相色谱仪按照EPA 8015 – GC/FID方法进行（伊拉夫斯克和赫里夫，2004年；USEPA，1999年）。

伊拉夫斯克，J.，赫里夫，J.，2004. 水中石油烃的微提取和毛细管气相色谱测定。斯洛伐克土木工程杂志，第1卷，13–17页。
洛伊德-罗伯茨，S.，2009. 为尼日利亚的石油财富而战 [网络文档]。BBC Two。URL http://news.bbc.co.uk/2/hi/programmes/newsnight/7816654.stm（访问日期：2019年12月29日）。
帕蒂尔，G.P.，2002. 复合采样，载于：沙阿拉瓦维，A.H.，皮格斯克罗，W.W.（主编），环境计量学百科全书。约翰·威利与 Sons Ltd，切斯特，第387–391页。https://doi.org/10.2307/2529498
USEPA，1999. 方法1664，修订A：n-己烷可提取物（HEM；油和油脂）以及硅胶处理的n-己烷可提取物（SGTHEM；非极性物质）通过提取和称重。华盛顿特区。