2015 : RESISTANCE AND BIOREMOVAL OF CHROMIUM BY AZOTOBACTER ISOLATED FROM ECO URBAN FARMING.

Dr. Dra. Enny Zulaika M.P.

Abstract

A chromate removing Azotobacterial was isolated from eco urban farming ITS-Surabaya. The Azotobacterial was studied for resistance to Cr (VI) and its ability to remove Cr (VI). Selective mannitol salt agar utilized to isolate Azotobacter. Potassium dichromate, K2Cr2O7, was used that had hexavelent chromium. It concentration from 5, 10 and 20 mg/L. Removal concentration of Cr (VI) measured by atomic absorption spectrophotometer (357.9 nm). All isolate of Azotobacter was found to tolerate Cr (VI) with a concentration of over 20 mg/L. Azotobacter A1a and A9 had better than A5 in removing Cr (VI) at 5 and 10 mg/L. All isolates of Azotobacter had more than 50% Cr (VI) bioremoval efficiency in 5 and 10 mg/L. Bioremoval efficiency tend to decline as low as higher Cr (VI) concentration.