ASTM Standards ASTM D4952-23 pdf free download – Standard Test Method For Qualitative Analysis For Active Sulfur Species In Fuels And Solvents (Doctor Test) ASTM D4952-23 pdf free download - Standard Test Method For Qualitative Analysis For Active Sulfur Species In Fuels And Solvents (Doctor Test). This test method is primarily designed for the detection of mercaptans in motor fuels, kerosene,... 09-27 Read More