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.