50 µg/mL of each analyte in MethanolCarbon tetrachloride 1,4-Dichlorobenzenetrans-1,2-Dichloroethene 　　　　TetrachloroetheneChlorobenzene 1,2-Dichloroethane 1,2-Dichloropropane 1,1,2-Trichloroethane1,3-Dichlorobenzene 1,1-Dichloroethene Ethylbenzene