2-Chloronaphthalene (100 µg/mL in Methylene chloride) .U-CH-110 ( 1 x 1 mL )1,2-Dichlorobenzene (100 µg/mL in Methanol). U-HC-110 ( 1 x 1 mL )1,3-Dichlorobenzene (100 µg/mL in Methanol).U-HC-120 ( 1 x 1 mL )1,4-Dichlorobenzene (100 &micr