Decreasing Bio-toxicity of Fume Particles Produced in Welding Process by Aloe vera L

As Aloe Vera L. can easily grow in Iran climates and due to vast probable contaminations from Iranian Natural Gas Transmission Pipelines Industry, the main purposes of this study were to decrease the risk levels for welders exposed to welding heavy metals in Iranian Natural Gas Transmission Pipelines Industry and determine the potential ability of A. vera for cleaning up Contaminated welding sites soil and the probable capability of this plant to phytoextract different metals (Chrome, Nickel, Copper, Cobalt, Lead and Cadmium) and also determine metal transfer factors from soil (TFS) by A. Vera in order to ascertain its phytoremediation potential. In winter and spring 2015, composite soil samples were collected from depth of 0-40 cm from soil samples of 5 cites from 10 sub cites Assaluyeh (Bushehr Province), Omidieh (Khuzestan Province) in Iran. The soil for the survey mixed thoroughly, then transferred to greenhouse in Tehran County. In order to assess amount of heavy metals transfer from soil to plant (shoot and root), translocation factor was determined by dividing metal concentration at shoot by its concentration at root. Metal contents were detected by Atomic Absorption Spectrophotometer by wet digestion method in Research Laboratory in Pharmaceutical Sciences Branch University. Results showed that A. Vera transition factors for all heavy metals in treated soil were higher than one and A. Vera can up-take lead and copper after 20 days (p<0.01) more than other studied metals. The best result of Cadmium phytoextract was in pH of soil 6.3 by 40 days growth of plants. The maximum Cobalt, Copper and Nickel uptake rate was in pH=6.1, 5.9 and 6.3 respectively by 40 day grown A. Vera.