5 components: As 10ug/l Pb 10ug/l Cd 5ug/l Cr 50ug/l Ni 20ug/l in HNO3 2% CRM, ISO 17034 and ISO 17025 Conservation 8 months. (4 months after opening) Store under normal laboratory conditions, at temperatures between 15C to 25C 1 * 100 mL