I'm looking for method for determine of Nonylphenols and Nonylphenol ethoxylates in detergents by GC/MS or HPLC/DAD or UV.

In literature there are many methods for the determination of Nonylphenols and Nonylphenol ethoxylates in wastewater or sludge. I'm looking for methods of their analysis in detergents, paper or leather.

Please share your experiences.

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