Evaluation of heavy metal and total petroleum hydrocarbon contamination of roadside surface soil (original) (raw)
Related papers
Soil Contamination with Petroleum Compounds and Heavy Metals-Case Study
2018
Crude oil, petroleum fuel and oil products represent most environmental contaminant of soil and the common sources of these products are motor fuel station underground storage tanks, home and commercial heating oil storage tanks, fuel distribution centers, refineries, crude oil production sites, and accidental spills. The main target of this paper is the study of the critical soil pollutants in a Romanian refinery area where soil pollution with petroleum products is one of the main sources of soil contamination. The methodology of study is measuring and monitoring of the pollutants and codify soil pollution profile. The chemical analysis of the crude oil-contaminated site included different groups of contaminants: PAHs, BTEX compounds, and heavy metals determined in the soil samples from the investigated area. The analytical procedure to measure petroleum contaminants and the heavy metal concentrations was performed according to standard methods in force: SR ISO 13877:1999, ISO 2215...
Abstract: The study investigated the concentration of heavy metal in soil around Nekede automobile mechanic village in Southeastern Nigeria. Sample plots were established in a randomized method along a transect at 100m interval for five (5) different locations within the study area, these sample point were constantly receiving spent engine oil (SEO) and were labeled treatment SA, SB, SC, SD, SE. A composite soil sample was drawn from depths of 0 – 15cm and 15 – 30cm for each of the five treatments. These were air dried, passed through a 2mm sieve and properly labeled for laboratory analysis. Soil samples were then analysed for heavy metal (Pb) using Atomic Absorption Spectrophotometer (AAS). Two (2) soil samples were collected at each sample point and two (2) soil samples CF and CG were also collected 2 km away from the study area in an undisturbed forest as control. Soil pH, cation exchange capacity (CEC) and particle size distribution were also determined. Results showed that the concentrations of Pb from soil samples were random across sample point. The concentration of Pb in the contaminated soil at a depth of 0 – 15cm (topsoil) varies, the highest value was observed at SD (482.2mg/kg) and the lowest value at SE (146.8mg/kg). At the depth of 15 - 30cm (subsoil) concentration of Pb is highest at SB (397.6mg/kg) and lowest at SC (140.1mg/kg). The mean concentration of Pb in the contaminated soil sample has its highest concentration at SB (382.9mg/kg) and lowest at SC (157.8mg/kg). The level of Pb in the control site was lower (CF, 46.5mg/kg and CG, 11.8mg/kg) when compared to the various concentrations of the contaminated soil. pH range was between 5.43 and 6.79. CEC varied across the sample area and showed no variation within the control site. The highest value was observed at CF and CG (3.65cmol/kg) respectively while the lowest value was observed at SA (2.15cmol/kg). The % sand distribution varied across the sample point and showed a higher distribution in the study area than % clay and % silt, the soil texture (sandy loam) was not significantly affected by the SEO. The study concluded that improper disposal of SEO in the study area elevated the soil Pb content thereby causing Lead pollution. Keywords: Spent Engine Oil (SEO), Lead Pollution, Soil properties, auto-mechanic village