Analysis of Old Lubricating Oil for Total Metal Content Using a Slurry Method with Internal Standard

13 Analysis of Old Lubricating Oil for Total Metal Content Using a Slurry Method with Internal Standard [7] 

A useful method of analysis of cmde and wear metals is the sample slurry method. It is well known that cmde and wear oils contain soluble, suspended and insoluble metal particulates and analysis of oils containing the soluble and suspended metals can be successfully carried out using a slurry method, provided that they are less than 4.0 pm in size and at a concentration that can be detected. An internal standard can be added to the oil sample slurry and nebulised along with the sample for matrix correction. 

Samples can be analysed against standards prepared in the same solvent used to dissolve the slurry/sample. 

An internal standard can be added to the stirring slurry solution to correct for variation in matrix effect. 

It avoids the use of hazardous acids required for digestion and solution. 

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