Supplier Page from Aladdin Scientific Corporation for Biochemical oxygen demand standard
[3-(3,5-Dichlorophenyl)-2,5-dioxoimidazolidinyl]-N-(methylethyl)carboxamide standard solution from Aladdin Scientific Corporation
NH4+ in Water from Aladdin Scientific Corporation
Sodium Chloride Standard Solutions for Osmometer Calibration from Aladdin Scientific Corporation
Water quality permanganate index standard from Aladdin Scientific Corporation