Sampling was done in six sampling stations for one year (August, 2014- July, 2015) to investigate the impacts of makeshift oil refineries physico- chemistry of the interstitial water of the Nun River estuary of the Nun River estuary in the Niger Delta region of Nigeria after over 3 years of chronic pollution of this estuary by the makeshift refinery activities. The results of the analysis revealed that the Total Hydrocarbon Content (THC) of the estuary was exceptionally high (ranged from 632.4mg/l - 1996.5mg/l), the pH was acidic (ranged from 5.27 to 6.56), the DO was very low (ranged from 0.59 mg/l to 2.76mg/l), the BOD was high (ranged from 8.66 mg/l to 10.37 mg/l), and the sulphate, phosphate, and nitrate concentrations were high- ranging from 214.7mg/l to 935.87mg/l, 0.03mg/l to 1.65mg/l, and 0.12mg/l- 2.08mg/l, respectively. Temperature, salinity, pH, DO, BOD, SO4, PO3-, NO- exhibited significant differences between stations and between months- P< 0.5. However, THC had significant difference of between stations (P< 0.05) but no significant difference between months (P>0.05).


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