2014•Unpublished venueRequires access
Investigation of Lacan soil contamination with heavy metals and their accumulation in the regional plants
Seyed Alireza Sharifi, Ali Lotfi, Mansoor Ghorban Pour
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Abstract
Soil contamination around mines and related industries, is a global problem that has received much attention over the past three decades. During manufacturing process of Lacans lead and zinc factory in Mrkazi province, the release of large amount of various pollutants into the environment contaminate water and soil resources and also the air of that area. The objective of this study was to investigate the vegetation and soil contamination with heavy metal elements by measuring the levels of lead, zinc and cadmium in soil and vegetation of the area. In this study, samples from three species including Astragalus parrowianus, Gunjelia tournefori and Hurdeum bulbosum with the soil around their roots were collected in two contaminated and control areas and their cadmium; lead and zinc contents were identified and measured. Lead and zinc were measured after the digestion of the samples by Atomic Absorption Spectrophotometer and Cadmium analysis was performed using an ICP device. Statistical analysis of data was carried out using a variety of methods including multi-factor analysis of variance and independent t-test. The results showed that the levels of lead, zinc and cadmium in the soil surrounding industrial-mining unitsare734mg/kg, 7499mg/kg, 18.85mg/kg respectively and in the control area they are 77.8mg/kg, 273.6mg/kg , 2.5mg/kg and in the plants of the area surrounding the unit they are 251.8mg/kg, 1153.4mg/kg, 3.16mg/kg respectively and in the control area they are 44.85mg/kg, 48.4mg/kg,0.12mg/kg, respectively that indicate the great difference between the two areas. The mean of lead content in the surrounding plants of the factory also indicates that the accumulation of heavy metals in the roots of Gunjelia tourneforti and Hurdeum bulbosum was much more than above-ground organs but in the Astragalus parrowianus species no significant difference was observed between the amount of the accumulation in roots and above-ground organs.