Modeling degradation kinetics of profenofos using Acinetobacter sp.33F

Abstract

Profenofos has been known for history of contamination to aquatic systems. The fate of profenofos in liquid medium is unknown due to limited number of studies performed. Very less information is available about the degradation behavior of profenofos in the liquid medium. This study is an attempt to analyze the growth and degradation kinetics of profenofos in the minimal salt medium and Hoagland’s solution using an efficient bacterial strain Acinetobacter sp.33F. Acinetobacter sp.33F has been proven to degrade profenofos in soil earlier, but its profenofos degradation kinetics has not been evaluated. Hoagland’s medium is considered for degradation studies because it is used in the hydroponics cultivation in soil-less environments. Hoagland’s solution will act as a mimic for the soil, and its effect on profenofos biodegradation will be evaluated. The study evaluated the growth and degradation kinetics of commercial and analytical grade profenofos using an efficient bacterium Acinetobacter sp.33F. The kinetics studies were performed in minimal salt medium and Hoagland’s medium. Growth kinetics parameters including μ max (h −1 ), K s (mg/L), K i (mg/L), and μ max /K s . were calculated. Degradation kinetics parameters including q max (mg h − 1 ) and K S (mg/L) were calculated. • Profenofos degradation kinetics modeling was performed in soil less aqueous solutions. • Profenofos degradation and kinetics modeling were performed at 25–200 mg/L. • The bacterium degrades profenofos in minimal medium as well as in hydroponic condition. • This is the first report of profenofos degradation kinetics in Hoagland’s solution.