Simple Spectrophotometric Determination of Iron in Diesel Oil after Sample Preparation Employing Extraction Induced by Emulsion Breaking

Abstract

This work reports the development of a simple and fast method for the spectrophotometric determination of Fe in diesel oil using the classic reaction with 1,10-phenanthroline after its extraction induced by emulsion breaking (EIEB). The extraction parameters of EIEB were optimized (concentration of HNO3 and Triton X-100® in the emulsifying solution) as well as the adjustment of the pH of the final solution, a necessary step to complete the colorimetric reaction. The developed method presented a limit of detection of 0.004 mg L–1 and a limit of quantification of 0.013 mg L–1 and was applied in the analysis of six samples of diesel oil with different specifications. The results were statistically similar to those obtained by graphite furnace atomic absorption spectrometry (GF AAS). A recovery test was also performed by spiking the samples with 1.0 mg L–1 of Fe in the form of an organometallic compound, yielding recovery percentages between 83 and 108%.

Effect of Different Droplet Impinging Models on Oil Film Formation of Diesel Engine’s Piston

“…The key parameters for the influence of droplet impinging are the position parameter: the eccentricity of the droplet, that is, the direction of the droplet moving; the Weber number; the droplet is prone to rebound when the Weber number is small, and coalescence is easy to occur when the Weber number is large; the droplet size; the viscosity of the droplet; droplet surface tension; heterogeneous structures, such as water-in-oil and oil-in-water; and the influence of pressure, temperature, and density in the cylinder [7][8][9][10] . In this paper, a fuel injection model was constructed to analyze the influence of different droplet-wall interaction models on the diesel engine cylinder oil film.…”