Abstract
Assessment of seasonal variation in concentration of the heavy metals- Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn- in Abattoir dump site soil at Yauri, Nigeria, was undertaking during the two major seasons of Nigeria. Thiswas done to determine the environmental pollution status of the soil at the dump site. Soil samples (0–15cm) collected during the 2007/2008 rainy and dry seasons were treated and digested using microwave acid digestion methods. The heavy metal concentrations were determined with Atomic Absorption spectrophotometer (AAS). Themean levels range of Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were 13.2 - 30.02mg/kg, 59.14–102.50mg/kg, 59.32 –96.13mg/kg, 2569 – 4130mgkg, 263.01 – 608.11mg/Kg, 36.21 –107.13mg/kg, 15.60 – 30.09mg/kg and56.31–92.50mg/kg for dry seasons and 10.13–22.76mg/kg,49.96– 89.46mg/kg,49.12–73.08mg/kg,23330.02– 3671.14mg/kg,249.72– 61.03mg/kg,33.50–99.06mg/kg,16.20–28.11mg/kg, and 50.91- 89.10mg/kg for wet seasonrespectively. The analytical results indicated that in both wet and dry seasons some metals concentrations were above the literature levels of a typical soil, which course for concern.
Highlights
Eight sampling spots at a distance of 50 m from each other were mapped out for soil samples collection within the sampling site
Heavy metals are basically recovered from their ores by mineral processing operations (Peplow, 1999; Lenntech, 2004; UNEP/GPA, 2004; USDOL, 2004)
The samples were digested in a CEM 2000 Microwave digestor at 100 pounds per square inch (PSI) for 5.5 min (CEM Corporation, Matthews, NC).They were filtered through Whatman 42 Filters and transferred to 100 ml volumetric flasks
Summary
Eight sampling spots at a distance of 50 m from each other were mapped out for soil samples collection within the sampling site. A soil sample for each season to serve as control was collected from a site about 50 m away from the dump site. The pH of the soil samples was determined with Orion Research Analog pH meter/model 30l according to standard analytical methods. A well-mixed sample of 0.5-1.0g was weighed into a 120 ml Teflon PFA microwave digestion vessel and 10 ml of concentrated HNO3 was added (EPA Method 3051). The samples were capped and weighted to determine possible acid loss during digestion. The samples were digested in a CEM 2000 Microwave digestor at 100 pounds per square inch (PSI) for 5.5 min (CEM Corporation, Matthews, NC).They were filtered through Whatman 42 Filters and transferred to 100 ml volumetric flasks. Samples with weight loss of greater than 10% were redigested. Instrumental conditions are as reported earlier (Oladipo et al; 2005)
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