Analysis of Adulterant Kerosene in Diesel by Kinematic Viscosity Measurement

Quantitative determination of adulterant in petroleum products viz diesel, petrol and kerosene is great challenge to police, revenue and forensic department. The literature methods are tedious, time consuming with large scope for errors. Viscosity measurement of known admixtures of diesel and kerosene at 40C give linear plot. The viscosity comparisons of unknown sample with known admixtures directly give percentage of kerosene in diesel. Admixtures of kerosene in diesel in the ratio 10:90, 20:80, 30:70, 40:60, 50:50, 60:40, 70:30, 80:20 and 90:10 were prepared and 2 ml of sample of known admixture and unknown was injected to sample cell at 40C. The Kinematic viscosity was measured twice if relative standard deviation is below 2% the instrument shows valid result and gives the actual values of kinematic viscosity. The intercept of viscosity of unknown sample on straight line graph of known admixture directly give the percentage of kerosene in diesel.