An infrared spectroscopic method for quantitative analysis of fatty alcohols and fatty acid esters in machinery oils.
A new infrared spectroscopic method suitable for determining total fatty alcohol and fatty acid ester concentrations in industrial oils has been developed. Oil samples were diluted with toluene (1:3 w/w), the toxicity and volatility of which are relatively low compared with more commonly used IR solvents, like carbon tetrachloride or carbon disulfide. Mixture standards were prepared from dodecanol, tetradecanol, octadecanol, methyl stearate and methyl palmitate. Some analytical and statistical tests were performed on the developed method. The recoveries and the repeatability of the method proved to be sufficient for the quantitative determination of fatty alcohol and fatty acid ester additives in industrial oils. Reproducibility testing in another laboratory also produced satisfactory results. The developed method also proved to be relatively quick and simple. This method was developed to satisfy industry's need to determine the concentrations of these oil additives, and it has already been applied successfully in machinery oil analysis.
Vähäoja
Pekka
P
Department of Chemistry, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland. Pekka.Vahaoja@oulu.fi
Närhi
Jani
J
Kuokkanen
Toivo
T
Naatus
Outi
O
Jalonen
Jorma
J
Lahdelma
Sulo
S
D002246:Carbon Disulfide / Q000737:chemistry; D002251:Carbon Tetrachloride / Q000737:chemistry; D007851:Dodecanol / Q000032:analysis; D004952:Esters / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis*; D005233:Fatty Alcohols / Q000032:analysis*; D010168:Palmitates / Q000032:analysis; D010938:Plant Oils / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013228:Stearates / Q000032:analysis; D014835:Volatilization
D004952:Esters; D005227:Fatty Acids; D005233:Fatty Alcohols; D010168:Palmitates; D010938:Plant Oils; D012997:Solvents; D013228:Stearates; D007851:Dodecanol; D002251:Carbon Tetrachloride; C019012:methyl palmitate; D002246:Carbon Disulfide