Radionuclides (40K, 232Th and 238U) and Heavy Metals (Cr, Ni, Cu, Zn, As and Pb) Distribution Assessment at Renggam Landfill, Simpang Renggam, Johor, Malaysia

International Research and Innovation Summit 2017

Zaidi, E.^1,2 ; Fahrulrazi, M.J.^2 ; Azhar, A.T.S.^3 ; Hazreek, Z.A.M.^3 ; Shakila, A.^2 ; Norshuhaila, M.S.^4 ; Omeje, M.^5

Research Centre for Soft Soil, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia^1

Faculty of Science, Technology and Human Development, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia^2

Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia^3

Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia^4

College of Science and Technology, Department of Physics, Covenant University, Ota, Ogun State, Nigeria^5

关键词: Activity concentration;    Annual effective dose;    Gamma-ray spectroscopy;    Heavy metal composition;    Heavy metal concentration;    Heavy metals in soil;    Mean activity concentrations;    Naturally-occurring radionuclides;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/226/1/012070/pdf
DOI  :  10.1088/1757-899X/226/1/012070

来源: IOP

【 摘 要 】

The assessment of radioactivity levels and the distribution of heavy metals in soil samples at CEP Farm landfill, Renggam in Johor State was to determine the activity concentrations of naturally occurring radionuclides and heavy metal concentrations of this landfill. The background radiation was monitored to estimate the exposure level. The activity concentrations of radionuclides in soil samples were determined using HPGe gamma ray spectroscopy whereas the heavy metal concentration was measured using X-RF analysis. The mean exposure rate at the landfill site was 36.2±2.4 μR hr-1 and the annual effective dose rate at the landfill site was 3.19 ± 0.22 mSv yr-1. However, residential area has lower mean exposure dose rate of about 16.33±0.72 μR hr-1 and has an annual effective dose rate of 1.43±0.06 mSv yr-1 compared to landfill sites. The mean activity concentration of 40K, 238U and 232Th at landfill site were 239.95±15.89 Bq kg-1, 20.90±2.49 Bq kg-1 and 40.61±4.59 Bq kg-1, respectively. For heavy metal compositions, Cr, Ni and Cu have mean concentration of 232±10 ppm, 23±2 ppm, and 46±19 ppm, respectively. Whereas, Zn has concentration of 64±9 ppm and concentration of 12±1 ppm and 71±2 ppm was estimated for As and Pb respectively. The higher activity concentration of 40K down the slope through leaching process whereas the higher activity level of 238U content at the landfill site may be attributed to the soil disruption to local equilibrium.