IS 1448 : Part 101 : 2025 Petroleum and its Products - Methods of Test - Part 101 Colorimetric Determination of Phosphorus in Lubricating Oils

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This (Part 101) method is used for the determination of low concentrations of phosphorus in lubricating oils. Metallic elements, such as iron, lead, magnesium and barium in amounts commonly encountered in lubricating oils do not interfere. This method may also be used for the analysis of additive concentrates containing phosphorus in the pentavalent state but is not recommended if the material contains more than 10 percent by mass phosphorus.