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Response curves of the surfactant sensors toward (a) Hyamine 1622, (b) CPC, (c) CTAB and (d) DMIC in deionized water, for membranes containing six different plasticizers, from top to the bottom: 2-nitrophenyl-octyl-ether (P1), bis(2-ethylhexyl) phthalate (P2), bis (2-ethylhexyl) sebacate (P3), 2-nitrophenyl phenyl ether (P4), dibutyl phthalate (P5), dibutyl sebacate (P6).
