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Selected part of the X-ray fluorescence spectra of N-2{[bis(2-aminoethyl)amino]ethyl}-2,N′-dihexadecyl-propandiamid at π = 30 mN·m–1 on subphases with different pH values containing 2 mM Br– ions (left). Integral Br X-ray fluorescence intensity versus the subphase pH (right). (This figure was adapted from ref (49).)
