Method Abstract #64, Ammonia by pH Titration

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Ammonia by pH Titration

Method Abstract #64

Scope and Application

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.

Method Summary

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                                              

Method Performance

*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.

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