Semi-Volatiles Internal Standard Mixture - 6 components: 2000ug/ml each of Acenaphthene D10 [CAS:15067-26-2] ; Chrysene D12 [CAS:1719-03-5] ; 1,4-Dichlorobenzene D4 [CAS:3855-82-1] ; Naphthalene D8 [CAS:1146-65-2] ; Perylene D12 [CAS:1520-96-3] ; Phenanthrene D10 [CAS:1517-22-2] in Dichloromethane