Inductively coupled plasma-atomic emission spectrometry: trace elements in oil matrices

Abstract

Plasma ignition and sample introduction procedure 20 Sample preparation for lubricating oils 20 Dilution procedures and reference samples 20 Chemical oxidation procedure and reference samples 23 Analytical procedures 23 Analytical measurements 23 Wavelength profiles 23 CHAPTER III. DETERMINATION OF TRACE ELEMENTS IN PETROLEUM RELATED MATRICES 24 General Results 24 Wavelength scans 24 Detection limits 35 iii Analytical calibration curves 38 Wear Metals in Lubricating Oil 38 Metal Particles in Oil 44 Introduction 44 Wear metal particles in oil 47 Plasma emission-MIBK diluent vs. atomic absorption-acidified diluent 47 Chemical oxidation vs. dilution 53 Behavior of synthetic suspensions of iron particles in oil 55 Experimental equipment and sample preparation 56 Results and discussion 58 Loss of particles from suspension 58 Loss of particles in spray chamber Incomplete particle vaporization Summary Trace Metals in Fuel Oil CHAPTER IV. DETERMINATION OF TRACE ELEMENTS IN A CENTRIFUGED COAL LIQUEFACTION PRODUCT Wavelength profiles 79 Analytical results 89 Future Research 89 CHAPTER V. DETERMINATION OF TRACE ELEMENTS IN EDIBLE OILS 91 Experimental Conditions and Procedures 91 Samples, dilution procedures, and reference samples 91 Plasma torch placement 92 Other experimental conditions 92 Results and Discussion 94 Detection limits and analytical calibration curves 94 Wavelength profiles 94 Analysis of soybean oil samples 101 Analysis of commercial edible oils 105