Water quality -- Determination of alkalinity -- Part 2: Determination of carbonate alkalinity

Document Number: NL ISO 9963 2 : 2010
Sector: Food Technology
TC: NL TC 147
ICS: 13.060.50
This part of IS0 9963 specifies a method for the titrimetric determination of carbonate alkalinity in natural and drinking water. Using a higher pH value for the endpoint than the method specified in IS0 9963-1, the influence of other hydrogen ac- ceptors, such as anions of humic acids, is reduced by the procedure. The method is intended for samples with a carbonate alkalinity between 0,Ol mmol/l and 4 mmol/l (as H+ equivalents). For samples containing higher concen- trations of alkalinity, a smaller test portion can be used for analysis. In this context, carbonate alkalinity is often called total alkalinity and usually has nearly the same numerical value as methyl orange alkalinity (MO-alkalinity). The endpoint detection, using a pH-meter is less prone to interferences than the use of the indicator.