The methods described are to be used for the detection and determination of specified anti-oxidant additives in new hydrocarbon insulating oils.? The detection methods are to be applied to assess whether or not a hydrocarbon insulating oil contains an anti-oxidant additive as specified by the supplier.The determination methods are used for the quantitative determination of anti-oxidant additives previously detected by the appropriate detection method.Note. -- In certain cases@ the methods described may also be used for oils in service.