Determination of lithium stearate in sebacate-based lubricants by atomic absorption.
An accurate method is proposed for the determination of lithium stearate in sebacate-based lubricants. The sample is treated with dilute hydrochloric acid and an extraction is performed with ethyl ether to remove di-isopropyl phosphite which would otherwise interfere by causing the subsequent precipitation of lithium phosphate or lithium metaphosphate. The aqueous extract is then evaporated to fuming with perchloric acid and the lithium is determined by atomic absorption.
Norwitz
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Frankford Arsenal Philadelphia Pa. 19137, U.S.A.
Gordon
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