Dry Ashing with Retaining Aids

Samples of heavy duty and cmde oils, lubricating oils, worn oils, organic polymers, plastics, grease, etc., may be ashed with the retaining acid PTSA using the dry-ashing method up to temperatures of 650°C. This compound will retain most mono- and divalent states of elements in samples. The structure of PTSA is  

It is important to note that the same rules and observations need to be applied when preparing samples without additives/aids. 

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