DS EN 12139:1999 Surface Active Agents - Determination Of The Total Polyethylene Glycol Content Of Non-Ionic Surface Active Agents (Eo Adducts) By Hplc/Gpc Defines a method for the determination of the total polyethylene glycol (PEG) content of aromatic and aliphatic non-ionic surface active agents of the type R-(O-C2H4)p-OH, where 'p' is the mean ethyle