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First Standard® 柠檬醛
3,3',4,4'-四氯联苯
First Standard® 丙酮中甲基嘧啶磷溶液,100μg/mL
草酸钠二级标准品 volumetric standard, secondary reference material for redox titration, traceable to NIST Standard Reference Material (SRM) CertiPUR®
品管查核 标准品 for checking the quality of photometric methods for ammonium, CSB and nitrogen Spectroquant®
2,4,6-三氯苯酚标准溶液
邻苯二甲酸二正壬酯标准溶液
First Standard® 3,3-二甲基-4,4-二氨基二苯甲烷
2-Perfluorohexyl-[1,2-13C2]-ethanoic acid (6:2)
Perfluoro-n-hexanoic acid 威灵顿环境实验室标准品