Determination of Alcohols in Engine Lubricants.
SOUTHWEST RESEARCH INST SAN ANTONIO TX ARMY FUELS AND LUBRICANTS RESEARCH LAB
Pagination or Media Count:
THE RECENT INTEREST IN ALCOHOL AND ALCOHOL-CONTAINING FUELS IN SPARK IGNITION ENGINES REQUIRES NEW INFORMATION AND ANALYTICAL METHODS CONCERNING THE PRESENCE OF ALCOHOLS IN USED LUBRICANTS. AFLRL has developed a straightforward, rapid, and accurate method to determine and measure the alcohols. The oil and alcohols are separated using an adsorber or stripper column, and then the alcohols are resolved on the second column in series and determine with a flame ionization detector. Quantitative standards were prepared to include the normally expected range of alcohol content of 0-10 percent. The use of a second alcohol as an internal standard helps offset the reproducibility error involved in the syringe technique. The standard is completed by adding approximately 50 vo1 of CS2. It is suggested that the alcohol chosen as the internal standard be at least 2 carbon numbers higher or lower than the analyte to help enhance the peak resolution and integration. The sample are prepared in much the same manner as the calibration standards, with 1 to 5 percent of the alcohol chosen to be the internal standard added. Because of the small amounts of samples frequently encountered, it is not always reasonable to maintain the ideal 11 internal standardanalyte ratio. With small samples, the 11 ratio produces problems, such as the dispensing of micro quantities of isopropanol and the tedious mixing for homogeneous samples.
- Organic Chemistry