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Pollution assessment models of surface soils in Port Harcourt city, Rivers State, Nigeria

100%

Verla E. N., Verla A. W., Enyoh C. E.

World News of Natural Sciences

2017

vol. 12

1-20

Environmental pollution has resulted in several health and physiological problems in both plants and animals. This has witnessed growing number of models for assessment purposes. Some of these provide useful information, and reduce large data for easier understanding by policy-makers. In the current study of pollution, we used data from four locations: Oil Market, Trans Amadi, Borrokiri and GRA in Port Harcourt and a control taken from Federal Land Resource Umuahia (FLRU). A total of 25 composite soil samples were analyzed for physicochemical parameters and heavy metals, by means of a 969 Unicam AAS model series. The data obtained were then subjected to index models. Results showed iron (Fe) to be most abundant metal, ranging from 10.44 to 19.54 mg/kg, then Ni (8.03 to 13.6mg/kg), Cd (3.96 to 5.41 mg/kg), Pb (1.36 to 7.64 mg/kg), Zn (0.09 to 7.24 mg/kg), Cu (0.16 to 0.32) and As (0.07 to 0.11 mg/kg). All metal concentrations were below permissible limits set by NESRA. Contamination factor (Cf) and Igeo revealed moderate to heavy contamination by Cd and Zn. Anthropogenicity revealed that increasing metals in the environment are largely from anthropogenic inputs. The Pollution Index revealed that soils were unpolluted (PLI < 1) with the heavy metals. Furthermore, the Sodium absorption ratio showed that the soils are less sodic and could be good soils for plant growth. All four sites showed a linear relationship between anthropogenicity and geoaccumulation indexes, and so both indexes furnish basically the same information However, pollution from these metals in the study area should be under routine check for possible pollution in the near future, as some metals showed elevated concentrations above background values.

Distribution and Source Fingerprinting of Total Petroleum Hydrocarbons in Sediments of the River Niger at Okpu and Iyiowa-Odekpe Axes in South-Eastern, Nigeria

75%

Chokor A. A.

World News of Natural Sciences

2022

vol. 42

151-168

The assessment of total petroleum hydrocarbons (TPH) status as well as the aliphatic profiles of sediments from the Okpu and Iyiowa-Odekpe segments of the River Niger in South-Eastern Nigeria was conducted during the year 2021 – 2022. Composites samples taken from sediments at five (5) different locations (ST-A, ST-B, ST-C, ST-D, & ST-E) for the months of June, September, December, and February, were extracted with dichloromethane (DCM) using soxhlet extractor followed by a silica gel clean up and fractionation into aliphatic and aromatic fractions. Analysis of aliphatic fraction (Total Aliphatic Hydrocarbons –TAH - and aliphatic components) were done with gas chromatography-flame ionization detector (GC-FID); while the polycyclic aromatic hydrocarbons (PAHs) were determined with gas chromatography-mass spectrometry (GC-MS). The summations of TAHs and PAHs gave the TPHs concentrations that ranged from 108.04 – 1091.46mg/Kg with a mean of 440.0234 ± 54.78mg/Kg. The mean value for the raining season (515.10±281.73 mg/Kg) was significantly higher than that of the dry season (364.94 ± 205.54 mg/Kg). The range of values were also much higher than the Nigerian Department of Petroleum Resources (DPR) target value of 50mg/Kg but considerably much lower than the intervention value (5,000mg/Kg) set by the same body. Source diagnostic indices of aliphatic hydrocarbons gave range of: even to odd numbered n-alkane ratio (0.7183 – 1.7184), carbon preference index – CPI (0.65041 – 1.4520), sum of low molecular weight to high molecular weight n-alkane (1.0559 – 8.8077), nC31/nC19 (0.16867 – 1.1461), sum of long chain hydrocarbons to short chain hydrocarbons (0.1686 – 1.1470), and pristane/phytane ratio (0.6523 – 2.5284); suggesting that the TPHs in sediments were from mixed origin – anthropogenic and biogenic. Inputs from biogenic sources were however, dominated by marine sources. Developmental plans and actions that will reduce these anthropogenic inputs are necessary to protect the aquatic lives and sustain public health.

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2 World News of Natural Sciences

1 2022

1 2017

1 Chokor A. A.

1 Enyoh C. E.

1 Verla A. W.

1 Verla E. N.

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Pollution assessment models of surface soils in Port Harcourt city, Rivers State, Nigeria

Distribution and Source Fingerprinting of Total Petroleum Hydrocarbons in Sediments of the River Niger at Okpu and Iyiowa-Odekpe Axes in South-Eastern, Nigeria