Index model equation analysis: A case study of the risk and source of inorganic contaminants in roadside uncontaminated soil of the Egi oil producing area, Niger Delta
Elechi Owhoeke , Asmat Ali , Okorondu Justin Nnaemeka , Kingsley John Orie , Julius Nkeonyeasua Ehiwario , Abdur Rashid
{"title":"Index model equation analysis: A case study of the risk and source of inorganic contaminants in roadside uncontaminated soil of the Egi oil producing area, Niger Delta","authors":"Elechi Owhoeke , Asmat Ali , Okorondu Justin Nnaemeka , Kingsley John Orie , Julius Nkeonyeasua Ehiwario , Abdur Rashid","doi":"10.1016/j.ijsrc.2023.07.004","DOIUrl":null,"url":null,"abstract":"<div><p><span>This study examined the sources, health risk and pollution status of selected inorganic contaminants such as iron (Fe), nickel (Ni), cadmium (Cd), cobalt (Co), arsenic (As), manganese (Mn), lead (Pb), copper (Cu), zinc (Zn), and chromium (Cr) in representative roadside uncontaminated soil (</span><em>n</em><span> = 72) from the Egi crude oil mining areas (Oboburu, Obagi, and Ogbogu), Niger Delta, Nigeria, using a combination of multiple models (Principle component analysis (PCA), correlation analysis, geo-accumulation index (Igeo), contamination factor (CF), enrichment factor (EF), pollution load index (PLI), cancer risk (CR), hazard quotient (HQ), and metal daily intake (MDIm)). A random sampling method was applied in the sampling and analysis using inductively coupled plasma mass spectroscopy<span>. The result revealed that the mean (mg/kg) for Oboburu, was the highest for Fe (89.95 ± 28.83) and Mn (26.12 ± 7.642), whereas Obagi, had less Fe (28.90 ± 7.601) and Mn (16.80 ± 5.021), and Ogbogu, Fe (44.67 ± 28.15) and Pb (19.38 ± 8.731) was the second highest heavy metal. The order of contamination was F > Mn > Zn > Pb > Cu > Cr > Ni > Cd > Co. The Igeo and CF had cadmium as a metal of concern. The contamination level was low from the PLI estimation. The EF revealed anthropogenic sources for all the metals except for Ni, which was biogenic. The correlations at </span></span><em>p</em> < 0.05 and <em>p</em> < 0.01 showed much positive significance amongst the metals. Variations of the cumulative percentages, loading percentages, and eigenvalues from the regression plot gave a coefficients of determination (<em>r</em><sup>2</sup><span>) of 0.9936, 0.9995, and 0.9994, respectively. The PCA indicated that Cd and Ni were of anthropogenic origin; Mn, Fe, and Co were biogenic or natural, and Zn and Pb were of mixed origins. The CR assessment indicated a possible cancer risk due to Cr, Cd, and Ni, and the rest of elements have no carcinogenic risk. These findings suggest there should be regular monitoring, source control, and integrated environmental management of the study area.</span></p></div>","PeriodicalId":50290,"journal":{"name":"International Journal of Sediment Research","volume":"38 6","pages":"Pages 891-900"},"PeriodicalIF":3.5000,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Sediment Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1001627923000483","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
This study examined the sources, health risk and pollution status of selected inorganic contaminants such as iron (Fe), nickel (Ni), cadmium (Cd), cobalt (Co), arsenic (As), manganese (Mn), lead (Pb), copper (Cu), zinc (Zn), and chromium (Cr) in representative roadside uncontaminated soil (n = 72) from the Egi crude oil mining areas (Oboburu, Obagi, and Ogbogu), Niger Delta, Nigeria, using a combination of multiple models (Principle component analysis (PCA), correlation analysis, geo-accumulation index (Igeo), contamination factor (CF), enrichment factor (EF), pollution load index (PLI), cancer risk (CR), hazard quotient (HQ), and metal daily intake (MDIm)). A random sampling method was applied in the sampling and analysis using inductively coupled plasma mass spectroscopy. The result revealed that the mean (mg/kg) for Oboburu, was the highest for Fe (89.95 ± 28.83) and Mn (26.12 ± 7.642), whereas Obagi, had less Fe (28.90 ± 7.601) and Mn (16.80 ± 5.021), and Ogbogu, Fe (44.67 ± 28.15) and Pb (19.38 ± 8.731) was the second highest heavy metal. The order of contamination was F > Mn > Zn > Pb > Cu > Cr > Ni > Cd > Co. The Igeo and CF had cadmium as a metal of concern. The contamination level was low from the PLI estimation. The EF revealed anthropogenic sources for all the metals except for Ni, which was biogenic. The correlations at p < 0.05 and p < 0.01 showed much positive significance amongst the metals. Variations of the cumulative percentages, loading percentages, and eigenvalues from the regression plot gave a coefficients of determination (r2) of 0.9936, 0.9995, and 0.9994, respectively. The PCA indicated that Cd and Ni were of anthropogenic origin; Mn, Fe, and Co were biogenic or natural, and Zn and Pb were of mixed origins. The CR assessment indicated a possible cancer risk due to Cr, Cd, and Ni, and the rest of elements have no carcinogenic risk. These findings suggest there should be regular monitoring, source control, and integrated environmental management of the study area.
期刊介绍:
International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense.
The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.