Analysis of Hydraulic Fluids and Lubricating Oils for the Formation of Trimethylolpropane Phosphate (TMP-P).

摘要

Twenty-six different oils, hydraulic fluids and lubricants in U.S. Navy inventory were screened for yield of the neurotoxin Trimethylolpropane phosphate (TMP-P) in order to obtain an estimate of safety hazard potential. A commercially available synthetic aircraft engine oil (Exxon 2380) with a demonstrated yield of TMP-P was studied to establish the optimal temperature and pyrolysis time conditions for TMP-P production. Results of the analysis indicate that in the Exxon 2380 synthetic oil, TMP-P is formed very rapidly (within 5 minutes) with formation beginning in a temperature range of 350 to 400 C. The yield of TMP-P increases as a function of temperature and achieves a maximum yield at 450 - 500 C. Above this temperature, the TMP-P yield decreases rapidly to zero at 600 C probably due to thermal decomposition. Only one of the twenty-six oils from the U.S. Navy inventory gave evidence of TMP-P formation. The maximum TMP-P yield of oil (MIL-L-23699C) was only 1.9% (120 ug/g) of the maximum yield (6241 ug/g) for the Exxon 2380 synthetic engine oil. Results obtained in the Naval Submarine Medical Research Laboratory (NSMRL) study for Exxon 2380 have been found to be in good agreement with results obtained at National Transportation Safety Board and University of Colorado. Results reported from these three laboratories have been applied to an assessment of the hazard potential of pyrolyzed oils and lubricants assayed in this study. (aw)