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Three different sorbents (i.e. endcapped octadecylsilane, octasilane and styrene-N-vinylpiperidinone co-polymer) were investigated in order to develop an on-line solid phase extraction–liquid chromatographic tandem mass spectrometric method (on-line SPE–LC–MS/MS) for the simultaneous analysis of alkylphenols polyethoxylate (APnEOs, n = 1–8) and corresponding monocarboxylate (AP1ECs) and phenolic (APs)...
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