Abstract:
The present study targeted Chau Khe craft village of Tu Son town, Bac Ninh province, Vietnam,
where the recycled-steel craft has been performed widely for a long time, to evaluate
accumulation of heavy metals such as Cd, Cu, Pb and Zn in the agricultural soil surrounding the
iron-recycling area of Chau Khe. Total 12 soil samples was collected at the agricultural field
around Chau Khe village in 2010 and 2015, followed by analyses of the selected physicochemical
properties and the concentration of heavy metals in the soil. Results showed that the
concentations of total heavy metals in 2015 were all at a high level in the agricultural soil, with
averaged values of 0.47 mg/kg for Cd, 41.72 mg/kg for Cu, 34.77 mg/kg for Pb and 320.19
mg/kg for Zn, and exceeded by 1.5 times the threshold concentrations allowed by
QCVN03:2015/BTNMT - Vietnam National Technical Regulation on permissible limits of
heavy metals in the soil. The total concentration increased for Cu and Zn, whereas decreased for
Pb and Cd with time. The concentration of a soluble form increased only for Zn and decreased
for Pb, Cu and Cd with time. Correlation analysis indicated that the physico-chemical properties
of the agricultural soil were correlated more closely with the heavy metal concentration of a
soluble form than with the total heavy metal concentration |
