ASTM D4711-89(2017) pdf free.Standard Test Method for Sulfonic and Sulfuric Acids in Alkylbenzene Sulfonic Acids. ASTM D4711 is applicable to the determination of sulfonic and sulfuric acids in branched and linear alkylbenzene sulfonic acids used as intermediates in synthetic detergents. 5. Interferences 5.) Strong acids, like nitric and hydrochloric, interfere, as do weak acids, such as carhoxylic acids. Small amounts...