The content of mono-ester, di-ester and phosphoric acid in phosphate polyoxyethylene nonylphenol were reported with mixed-solvents by potentiometric titration.

Stronger surfactants such as nonyl phenol ethoxylate have a better effect but they are more detrimental to the environment.

Nonylphenol polyoxyethylene ether was esterified with maleic anhydride and then sulfonated with sodium bisulfite to form nonylphenol polyoxyethylene ether sulfosuccinic acid diester sodium salt.