This standard specifies carbonate alkalinity by titrimetric method. This method targets natural water. Because this method uses a higher pH endpoint than the method specified in JIS K 0400-15-10 (ISO 9963-1), interference with other hydrogen acceptors such as humate anions is reduced with this method. ing. This method is suitable for samples with carbonate alkalinity of 0.01--4 mmol/l (as H+ equivalent). If the concentration of the sample is higher than this, perform analysis using a smaller sample. In this context, carbonate alkalinity is called total alkalinity and is numerically almost identical to the value of methyl orange alkalinity (Mo-alkalinity). Using a pH meter as an end point detection method tends to cause less interference than the indicator method.
JIS K 0400-15-20:1998 history
1998JIS K 0400-15-20:1998 Water quality -- Determination of alkalinity -- Part 2: Determination of carbonate alkalinity