How are the Hach chlorine standards made?
Hach chlorine standard preparation
The Hach Chlorine standard solutions (Product # 1426810, 2630020, and 1426820) are prepared by generating and dissolving chlorine gas in slightly alkaline, high purity water of zero chlorine demand. The standard is packaged into clean ampules and sealed under argon. After preparation, ampules are assayed and stored between 2° - 8° C prior to shipment.