ESTIMATING THE POSIBILITY OF LEAD CONTAMINATION IN SOIL SURFACE DUE TO LEAD DEPOSITION IN ATMOSPHERE AROUND INDUSTRIAL ZONE

Abstract

In Ho Chi Minh city, there are eleven Industrial Zone (IZ) and Export Processing Zone (IPZ) in which almost of them are next to or interweave each other. Battery manufacture, paint manufacture, steelworks and so on are major industrial manufacture that emit lead (Pb) into atmosphere. Lead emission from factories in IZ and IPZ may cause harm to human health in around residence areas and more important this lead content can go down to deeper soil and ground water by the Lead deposition. Therefore, in this study, we analyze concentration of Lead and its substances in soil in order to assess the risk to human health in the case of unintentional digestion, and assess the possibility of soil, ground water contamination in the future. 31 soil samples which taken around radius of 1km from a steelwork factory’s stack in an anonymous industrial zone in Ho Chi Minh City in order to analyze the lead concentration which has risk of direct ingestion, and Lead elution in soil. After that, lead concentration which has risk of direct digestion were analyzed by extraction samples in HCl 1M. While in the lead elution in soil experiments, they were extracted by distilled water. Solutions after extraction in both experiments were analyzed by an inductively coupled plasma optical emission spectroscopy ICP – OES. The results show that the lead contents in soil fluctuate from 23mg/kg to 35mg/kg. And the lead elution samples are quite high, about 0.7mg/L comparing to Soil Contamination Control Law by Japan Ministry of the environment.