Acidity by Titration
Method Abstract #88
This method conforms to Standard Method 2310 B and ASTM D 1067. The acidity of a water sample is its quantitative capacity to react with a strong base to a designated pH. The acidity of a solution is based on the total acidic constituent of a solution.
Alkalinity analysis involves the titration of samples with standard 0.02N sulphuric acid (H2SO4) titrant to endpoints of pH 8.3 and 4.5. For alkalinities less than 20 mg CaCO3/L, an additional endpoint at pH 4.2 is recorded. 0.02N hydrochloric acid (HCl) titrant may also be used.
Sample Titration Curve
*Data for this measuring range was obtained using laboratory prepared standards formulated from potassium hydrogen phthalate. The measuring range may be increased by using larger capacity analysis vessels and/or auto-dilution.
**The Method Detection Limit (MDL) was determined based on data obtaining a coefficient of variance better than 30%. Results may differ depending on laboratory practices and sample matrix.
RSD values are better than those specified in Standard Methods