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Abstract

SCREENING OF HEAVY METAL TOLERANT AND DIESEL DEGRADING INDIGENOUS BACTERIA FROM PICHAVARAM MANGROVE - ESTUARINE

M. Jayashree, Jasmine John, S. Arunadevi, S. Venkat Kumar and A. Vidhya*

Abstract

Mangroves are salt tolerant plants found in tropical and subtropical coastal areas that are impacted by high anthropogenic pollution. Hydrocarbons are the world’s most widely used energy and fuel resource. The inevitable spillages have become a global problem in industrialized and developing countries, generated continuous research interest in this field. Heavy metals are liberated by a variety of industrial processes are present in the industrial effluents pollute the atmosphere, soils and aquatic ecosystems due to their mobility in natural ecosystem. These hydrocarbon and metal ion contaminations pose severe risks to human health and the environment. Biological approaches are being used for remediation of hydrocarbon pollution and heavy metals. The study is designed to screen the heavy metal tolerant and diesel degrading bacteria from Pichavaram Mangrove – Estuarine. The tidal water samples were collected, serially diluted and plated on to Nutrient agar plates to isolate indigenous bacteria. Screening for heavy metal tolerance bacteria was done by agar well diffusion method using varying concentrations of heavy metal salt solutions such as Cadmium sulphate, Copper sulphate, Zinc sulphate, Mercuric chloride, Lead acetate, Potassium dichromate, Manganese sulphate and Magnesium sulphate. Atomic absorption spectroscopy was used for the quantification of lead accumulation. Testing the diesel degradation ability of the heavy metal tolerant bacteria was performed using 1% of diesel in Bushnell Haas broth with DCPIP as an indicator. The biomass produced and CO2 evolved was estimated in the test and control. The functional groups in the test and control were determined by doing FT-IR and the potent isolate was identified to be Bacillus subtilis by phenotypic, biochemical and 16s rRNA analysis.

Keywords: Hydrocarbons, Diesel, Heavy Metals, Bacillus subtilis, Bioremediation.


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