Custom mix of naphthalenes 0711.10 Naphthalene 122,4 µg/mL 0713.11 2-Methylnaphthalene 310,8 0721.12 1,2-Dimethylnaphthalene 111,4 0725.12 1,6-Dimethylnaphthalene 111,4 0728.12 2,3-Dimethyl