Standard Practice for Determination of Nonylphenol Polyethoxylates (NPnEO, 3 "64; n "64; 18) and Octylphenol Polyethoxylates (OPnEO, 2 "64; n "64; 12) in Water by Single Reaction Monitoring (SRM) Liquid Chromatography/ Tandem Mass Spectrometry (LC/MS/MS)
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