Hexachlorobenzene (13C6,99%) . 100 ng/mL Dieldrin (13C12,99%) . 100 ng/mL beta-HCH (13C6,99%). 100 ng/mL Lindane (γ-HCH) (13C6,99%). 100 ng/mL Heptachlor epoxide, B isomer (13C10,99%) . 100 ng/mL Oxychlordane (13C10,99%) . 100 ng/mL trans-Nonachlor (13C10