Packaging and storage—
Preserve in suitable, tight containers.
Labeling—
Label it to indicate the method of preparation and that it is not for parenteral administration.
pH 
791
:
between 5.0 and 7.0 in a solution containing 0.3 mL of saturated potassium chloride solution per 100 mL of test specimen.
Ammonia—
For containers having a fill volume of less than 50 mL, dilute 50 mL of it with 50 mL of
High-Purity Water (see
Reagents under
Containers 661), and use this dilution as the test solution; where the fill volume is 50 mL or more, use 100 mL of it as the test solution. To 100 mL of the test solution add 2 mL of alkaline mercuric–potassium iodide TS: any yellow color produced immediately is not darker than that of a control containing 30 µg of added ammonia (furnished by adding 1 mL of the final solution prepared by diluting 3.0 mL of
ammonia TS with
High-Purity Water to 100 mL; 1.0 mL of this solution is further diluted to 100 mL) in 100 mL of
High-Purity Water. This corresponds to a limit of 0.6 mg per L for containers having a fill volume of less than 50 mL and 0.3 mg per L where the fill volume is 50 mL or more.
Chloride—
To 20 mL in a color-comparison tube add 5 drops of nitric acid and 1 mL of
silver nitrate TS, and gently mix: any turbidity formed within 10 minutes is not greater than that produced in a similarly treated control consisting of 20 mL of a solution of sodium chloride in
High-Purity Water (see
Reagents under
Containers 661), containing 825 µg of sodium chloride per L (10 µg of Cl in 20 mL), viewed downward over a dark surface with light entering the tubes from the sides.
Oxidizable substances—
To 100 mL, add 10 mL of 2 N sulfuric acid, and heat to boiling. For Sterile Purified Water in containers having a fill volume of less than 50 mL, add 0.4 mL of 0.1 N potassium permanganate, and boil for 5 minutes; where the fill volume is 50 mL or more, add 0.2 mL of 0.1 N potassium permanganate, and boil for 5 minutes. If a precipitate forms, cool in an ice bath to room temperature, and pass through a sintered-glass filter: the pink color does not completely disappear.
