Evaluation And Characterization Of Trace Metals Contamination In The Surface Sediment Using Pollution Load Index (PLI) And Geo-Accumulation Index (Igeo) Of Ona River, Western Nigeria

Evaluation and Characterization of Trace Metal Contamination in the Surface Sediment Using Pollution Load Index (PLI) and Geo-accumulation Index (Igeo) Index of Ona River was conducted for six months. From the result of this study, the mean values of lead ranged between 0.004 mg/kg and 0.330 mg/kg, while the mean iron was highest (5.05 mg/kg) in station 4 and lowest (2.26 mg/kg) in station 5. The mean chromium value ranged from 0.007 mg/kg (station 1 and 2) to 0.021 mg/kg (station 3 and 4). The mean copper was highest (3.97 mg/kg) in station 1 and lowest (0.008 mg/kg) in station 2. Analysis of variance (ANOVA) revealed the same trend in spatial variation of these heavy metals. There was a significant difference (P 0.05) in iron among the study sampling station. The PLI values recorded for all the stations were below 1. Thus the sediment of the study stretch that Ona River is unpolluted. The Igeo values for chromium and iron fall in class '0' in all the five sampling stations, indicating that there is no pollution from these metals in the Ona River sediments, lead fall in class '3' in station 4indicating moderately to heavily contaminated condition and class '0'in station 1, 2, 3 and 5 and copper fall in class '3' in station 4 and 5, in class '6' in station 3 indicating extremely contaminated condition. The Igeo values were consistent with those derived for PLI. All trace metals had concentrations below the EPA regulatory limits for sediment except iron. From the results of this study, sediment quality reflects the impacts of anthropogenic activities on quality of the river. However, the continuous build-up of the metal contaminants can be checked if relevant government agencies ensure strict compliant of industrial standards which stipulate treatment of industrial waste before discharging such contaminated effluents/wastes into River. Therefore, perpetual assessment is highly recommended to minimize the potential health hazards of the people who surely depend on the River water for fishing and agricultural purposes.

[1]  J. G. Wilson,et al.  Problems in the assessment of heavy-metal levels in estuaries and the formation of a pollution index , 1980, Helgoländer Meeresuntersuchungen.

[2]  R. A. Akinola.  The Ibadan region , 1963 .

[3]  F. Vilas,et al.  Geochemistry of Major and Trace Elements in Sediments of the Ria de Vigo (NW Spain): an Assessment of Metal Pollution ☆ , 2000 .

[4]  F. W. Gilcreas,et al.  Standard methods for the examination of water and waste water. , 1966, American journal of public health and the nation's health.

[5]  A. D. Patgiri,et al.  Metal Pollution Assessment in Sediments of the Dikrong River, N.E. India , 2009 .

[6]  C. Anyakora,et al.  Heavy Metal Contamination of Ground Water: The Surulere Case Study , 2010 .

[7]  G. Akin-Oriola.  Zooplankton associations and environmental factors in Ogunpa and Ona rivers, Nigeria. , 2003, Revista de biologia tropical.

[8]  M. Boran,et al.  A Review of Heavy Metals in Water, Sediment and Living Organisms in the Black Sea , 2010 .

[9]  K. O. Boadu,et al.  Assessment of heavy metals pollution of sediments from Fosu lagoon in Ghana , 2011 .

[10]  J. Onyari,et al.  Heavy metals in sediments from Makupa and Port-Reitz Creek systems: Kenyan Coast. , 2003, Environment international.

[11]  A. Majolagbe,et al.  Trace Metals Distribution and Contamination in the Surface Marine Sediments of Roro Bay in Lagos, Nigeria , 2012 .

[12]  Thompson,et al.  Assessment of heavy metal contamination of sediments along the cross river channel in Cross River state , Nigeria , 2013 .

[13]  J. Olomukoro,et al.  Heavy Metals and Macroinvertebrate Communities in Bottom Sediment of Ekpan Creek, Warri, Nigeria. , 2009 .

[14]  Horsfall M. Jnr.  Index Model Analysis Approach to Heavy Metal Pollution Assessment in Sediments of Nworie and Otamiri Rivers in Imo State of Nigeria , 2012 .

[15]  A. O. Olusegun,et al.  Heavy metal distribution in crab (Callinectes amnicola) living on the shores of Ojo Rivers, Lagos, Nigeria , 2009 .

[16]  A. M. Rabee,et al.  Using Pollution Load Index (PLI) and Geoaccumulation Index (I-Geo) for the Assessment of Heavy Metals Pollution in Tigris River Sediment in Baghdad Region , 2011 .

[17]  Andem,et al.  A study on some physical and chemical characteristics of Ona River, Apata,Ibadan South-west, Oyo State, Nigeria , 2012 .

[18]  J. Gordon,et al.  Heavy Metals in Sediments from Makupa and Port-Reitz Creek Systems: Kenyan Coast. Environment International 28, 639-647 , 2003 .

[19]  A. E. Ogbeibu,et al.  Using Pollution Load Index and Geoaccumulation Index for the Assessment of Heavy Metal Pollution and Sediment Quality of the Benin River, Nigeria , 2014 .

[20]  R. Gabbianelli.  Journal Of Environmental Chemistry And Ecotoxicology , 2009 .