Comparison Copper Absorption Capacity with Several Bacteria Stains from the Surface of Macroalga Gracilaria lemaneaformis (Rhodophyta)

Abstract:

The main pollution of coastal sea is heavy metal and eutrophication, which resulted in degeneration of its eco-function. Pollution of heavy metal is accompanied with eutrophication in sea water. This article studied on copper absorption capacity of several bacteria strains which were isolated from the surface of macroalga Gracilaria lemaneaformis that was cultivated in copper polluted sea. We got 6 strains of epiphytic bacteria from the seaweed, Ochrobactrum anthropi, Aeromonas?salmonicida, Micrococcus lylae, Corynebacterium ulcerans, Pseudoalteromonas spp, Vibrio fluvialis. Attained from the experiment of copper biosorption, A.?salmonicida had a maximal biosorption capacity among them, and Vibrio minimal. Based on this trail, A.salmonicida, C. ulcerans and Vibrio were selected for next trails included optimal biosorption time, optimal pH value and effect of pre-disposal by several chemical reagents on biosorption capacity. The results showed: optimal biosorption time was between 40 minutes and 60 minutes, and optical pH value 4~5. Pre-disposal by HCl leaded to lost the absorption capacity of A.?salmonicida, but was opposite by NaOH and ethanol. For C. ulcerans and Vibrio, the copper absorption capacities were increased by them.