Potassium Chloride,Potassium Bicarbonate,and Potassium Citrate Effervescent Tablets for Oral Solution
»Potassium Chloride,Potassium Bicarbonate,and Potassium Citrate Effervescent Tablets for Oral Solution contain not less than 90.0percent and not more than 110.0percent of the labeled amounts of Kand Cl.
Packaging and storage— Preserve in tight containers,protected from excessive heat.
Labeling— The label states the potassium and chloride contents in terms of weight and in terms of milliequivalents.Where Tablets are packaged in individual pouches,the label instructs the user not to open until the time of use.
Identification— One Tablet dissolves in 100mLof water with effervescence.The collected gas responds to the test for Bicarbonate á191ñ,and the resulting solution responds to the tests for Potassium á191ñ,for Chloride á191ñ,and for Citrate á191ñ.
Assay for potassium—
Potassium stock solutionand Standard preparations— Prepare as directed in the Assayunder Potassium Chloride Oral Solution.
Assay preparation— Transfer 10Potassium Chloride,Potassium Bicarbonate,and Potassium Citrate Effervescent Tablets for Oral Solution to a 2000-mLvolumetric flask,dissolve in 200mLof water,swirl until effervescence ceases,dilute with water to volume,and mix.Filter,and quantitatively dilute an accurately measured volume of the filtrate with water to obtain a solution containing 30µg of potassium per mL.Transfer 5.0mLof the resulting solution to a 100-mLvolumetric flask,add 2.0mLof sodium chloride solution (1in 5)and 1.0mLof hydrochloric acid,dilute with water to volume,and mix.
Procedure— Proceed as directed for Procedurein the Assayunder Potassium Chloride Oral Solution.Calculate the quantity,in mg,of potassium (K)in each Tablet taken by the formula:
L(C/D),
in which Lis the labeled quantity,in mg,of potassium in each Tablet,Cis the concentration,in µg per mL,of potassium in the Assay preparation,and Dis the concentration,in µg per mL,of potassium in the Assay preparationon the basis of the labeled quantity in each Tablet and the extent of dilution.
Assay for chloride— Transfer a number of Potassium Chloride,Potassium Bicarbonate,and Potassium Citrate Effervescent Tablets for Oral Solution,equivalent to about 900mg of chloride,to a 2000-mLvolumetric flask.Add about 200mLof water,swirl until effervescence ceases,dilute with water to volume,and mix.Transfer 25.0mLof this solution to a 250-mLconical flask,add 50.0mLof 0.1Nsilver nitrate VSand 15mLof nitric acid,and boil,with constant swirling,until the supernatant is colorless.Cool to room temperature,add sufficient water to make a volume of about 150mL,add 5mLof ferric ammonium sulfate TS,and titrate the excess silver nitrate with 0.1Nammonium thiocyanate VSto a permanent faint brown endpoint.Each mLof 0.1Nsilver nitrate is equivalent to 3.545mg of Cl.Calculate the quantity,in mg,of chloride (Cl)in each Tablet by dividing the total amount of chloride in the Tablets taken by the number of Tablets taken.
Auxiliary Information— Staff Liaison:Karen A Russo,Ph.D.,Scientist
Expert Committee:(PA1)Pharmaceutical Analysis 1
USP28–NF23Page 1587
Phone Number:1-301-816-8379