SRM 2668 Toxic Elements in Frozen Human Urine人体尿液中的有毒元素 Set (10) (5 each conc)
SRM 2669 Arsenic Species in Frozen Human Urine 冰冻人体尿液中的砷 Set (10) (5 each conc.)
SRM 2670a Toxic Elements in Urine (Freeze-Dried)尿液中的有毒元素(冷冻干燥) set (4) (2 each conc)
SRM 2682c Subbituminous Coal (Nominal Mass Fraction 0.5 % Sulfur) 次烟煤(公称质量分数为0.5%的硫) 1 bottle x 50g
SRM 2683c Bituminous Coal (Sulfur, Mercury, and Chlorine)沥青煤(硫,汞,氯) 50g
SRM 2684c Bituminous Coal (Nominal Mass Fraction 3 % Sulfur)沥青煤(公称质量分数3%硫) 50g
SRM 2685c Bituminous Coal (Nominal Mass Fraction 5 %Sulfur)沥青煤(公称质量分数5%硫) 50g
美国NIST标准品 SRM 2686a Portland Cement Clinker波特兰水泥熟料 4 vials x 7g
SRM 2687 Portland Cement Clinker波特兰水泥熟料 3 vial x 10g
SRM 2688 Portland Cement Clinker波特兰水泥熟料 3 vials x 10g