Abstract
Arsenic occurs naturally in the environment, but its uncontrolled liberation from industrial effluents has been imposing adverse effects on the environment. The continuous exposure of the soil is a matter of concern in this study. The soil consortium contains bacterial colonies that resist and adapt the metal toxicants and can in turn help in the bioremediation of such metals from the soil. This study stresses the isolation of arsenic resistant bacteria from the arsenic-contaminated soil. The Soil Sample was collected from the Sanganer area of Jaipur, Rajasthan. The soil in this area received the textile discharge from the industries located nearby. Four arsenic resistant bacteria were isolated from the sample which showed a high tolerance level towards arsenic and was able to grow in the presence of arsenic in-vitro. The Minimum inhibitory concentration was also determined for the strains against arsenite. The highest MIC was found to be 16mM of arsenite, which concludes tolerable limits of the strains. The Biochemical and Morphological characterization of the isolates was also conducted. The Four isolates also showed resistance towards various other metals like cadmium, cobalt, lead, zinc, mercury, chromium, and tin. The isolates on biochemical characterization were found to belong to the following Genus: Moraxella, Azomonas, Acetobactor and Corynebacterium. This resistance capacity of the isolates depicts their potential to bioremediate the toxicity of the arsenic in the environment.
Highlights
Arsenic is the twentieth abundant element on earth’s crust, and the most toxic element encountered by the environment
Four arsenic resistant bacteria were isolated from the sample which showed a high tolerance level towards arsenic and was able to grow in the presence of arsenic in-vitro
The presence of arsenic in the soil can be supported by the work of researchers like Jaishree and Khan et al, 2014, Mahawar et al, 2015 as they suggest the textile effluents discharged after processing of product contains heavy metals
Summary
Arsenic is the twentieth abundant element on earth’s crust, and the most toxic element encountered by the environment. It is present in both organic as well as inorganic forms, where inorganic forms of arsenic are more toxic than organic forms (Hopenhayn, 2006). Arsenic enters the terrestrial and aquatic environment, as the result of both geogenic processes and anthropogenic activities. Most commonly found inorganic forms include, arsenate [As(V)] and arsenite [As(III)]. The adverse effects of exposure to these inorganic forms can cause decrease in production of RBC and WBC, the significant amount can result in developing cancer associated with skin, lungs, bladder and kidney, liver and lymphatic system (Hopenhayn, 2006)
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