Assessment of multi-metal resistant bacteria from Periyar river, Southern India

S Prasanth,V Mahesh

doi:10.7439/ijasr.v2i1.2889

Abstract

A total of thirty bacterial strains were isolated from the water and sediment samples of Periyar river during premonsoon 2015 for multi-metal resistant study. In this study, the bacterial isolates were challenged against three different concentrations (10, 100 and 200 mM) of copper and chromium metal salt solution by using of plate diffusion method. Most of the isolates from Periyar river were resistant to minimum concentration of the both metal solutions. Nearly, 93.3 % were resistant to copper solution whereas 90.0 % were resistant to chromium solution. In 200 mM of Cu, 46.7 % of the populations showed growth rates between 71-80%, whereas 3.3 % of the populations were observed with a 51-60 % growth rate. At 200 mM Cr, 6.7 % of the populations showed 51-60 % growth rate. A growth rate between 61-70 % was observed for 13.3 % of the bacterial populations at 200 mM of Cr, whereas no population was growing at a growth rate of 050 % with 200 mM of Cr. The results indicated that the river received various pollution sources throughout the river-line. The sensitivity nature of the bacterial isolates against metal solutions were varied depend on the concentrations of the metal solutions. Hence, the river needed throughout impoundment for maintaining sanitation.

Highlights

Heavy metal pollution has drawn increasing attention worldwide owing to a dramatic increase in anthropogenic heavy metals in ecosystems through air, water and soil [1]
The multi-metal resistant bacterial strains were analyzed against copper and chromium metals with different concentrations
This study indicated that the increasing concentration of the metal solution affects the bacterial growth at considerable level

Summary

Introduction

Heavy metal pollution has drawn increasing attention worldwide owing to a dramatic increase in anthropogenic heavy metals in ecosystems through air, water and soil [1]. Heavy metals comprise the major elemental composition of sea. River water velocity decreases, relative to the river channel areas, as fresh water mixes with sea water. This process results in the deposition of sediments with associated heavy metals [2]. The historical inputs of these metals are still a primary problem for fragile ecosystems and coastal areas, in economically-challenged countries [3]. One of the effects is an increase in heavy metal solubility, which results in the accumulation of these toxic elements in the environment

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