7. ANALYTICAL METHODS - Agency for Toxic Substances and ...

When ammonia is found in biological materials at physiological pH (7.2), most of it (99%) will be found . as ammonium ion, due to its pK. a. of 9.2. This is an important consideration for any subsequent analysis. The determination of ammonia (as dissolved NH. 3. and ammonium ion) in blood, plasma, or serum is of

  Ammonia, Ammonium, Of ammonia, And ammonium