Supplier Page from Aladdin Scientific Corporation for Spectrophotometry Potassium Dichromate Absorbance/Transmission Standard
Copper Standard from Aladdin Scientific Corporation
Five canions mixed standard ( Sodium,Ammonium,Potassium, Magnesium,Calcium ) from Aladdin Scientific Corporation
Standard substance for analysis of iodine ion (I -) in water from Aladdin Scientific Corporation
Turbidity Standards from Aladdin Scientific Corporation