Inhibitory effects of nicotine on corrosion caused by Desulphovibrio sp. isolated from water pipes

Abstract

The inhibitory effects of nicotine on corrosion caused by Nigeria was carried out. Nicotine was extracted from organism was inoculated into Postgate medium containing water pipes, with nicotine concentrations of 10mg/ml, 50mg/ml, 200mg/ml, 300mg/ml, 400mg/ml and 500mg/ml. A control was set up (without nicotine) and the culture was incubate anaerobically for 30days. The rate of corrosion was determined by weight loss method. For nicotine extracted from cigarette, average % weight loss at concentrations of 10mg/ml, 50mg/ml, 200mg/ml, 300mg/ml, 400mg/ml, 500mg/ml and control (0mg/ml nicotine) were 3.10%, 1.7%, 1.74%, 1.08%, 1.44%, 0.31% and 6.57% respectively while for nicotine extracted from tobacco leaf, the average % weight loss at concentrations of 10mg/ml, 50mg/ml, 200mg/ml, 300mg/ml, 400mg/ml, 500mg/ml and control (0mg/ml nicotine) were 3.44%, 3.11%, 1.54%, 0.73%, 0.85%, 0.13% and 5.57% respectively. At 50mg/ml, 200mg/ml, 300mg/ml, 400mg/ml, 500mg/ml concentration, there were significant differences (P<0.05) between the % weight loss of the various concentration of nicotine extracted from cigarette and tobacco leaf between the 4 there was no significant difference (P>0.05) at the second day incubation and at 0 and 10mg/ml concentration. The results of study showed that higher concentrations of nicotine had varying inhibitory effect on the test organisms.