3. 1.0mg hexatriacontane 100% 4ml amber screw top vial 4. 1x2ml anthraquinone in dichloromethane 200pg/μl flame sealed amber ampoules. 5. 1x1ml 2,3,7,8 tcdd in nonane 2,3,7,8,13c tcdd 1pg/μl : signal to noise solution, flame sealed amber ampoules. 8.