Karl Fischer Titrator Calibration, Purpose:
Karl Fischer Titrator Calibration, The purpose of this SOP is to describe the operation, standardization of titrants, calibration, cleaning and maintenance of Karl Fischer Titrator (Model: Mettler Toledo V20 Compact) used for the determination of the water content in the quality control laboratory at XX Pharmaceuticals Ltd.
Karl Fischer Titrator Calibration, Scope:
This procedure is applicable to the Karl Fischer Titrator, used for the determination of water content, in the analysis of raw materials, intermediate and formulated drug product, installed in the quality control laboratory of XX Pharmaceuticals Limited.
Definitions/Abbreviation:
[][]SOP: Standard Operating Procedure
[][]QC: Quality Control
[][]KF: Karl Fischer
Responsibilities:
The roles and responsibility is as follows:
Officer/Executive/Sr. Executive,
[][]Quality Control
[][]To ensure that this procedure is followed.
[][]To maintain the records properly as per SOP.
Manager, Quality Control
[][]To ensure that this procedure is kept up to date.
[][]To confirm that the SOP is technically sound and reflects the required working practices.
[][]To arrange training on the SOP to all concerned personnel and to ensure implementation of the SOP after training.
[][]Schedule calibration of the instrument at the defined intervals.
Head of Quality Assurance
[][]Approval of the SOP.
[][]To ensure the overall implementation of the SOP.
Procedure:
Precaution(s):
[][]The equipment should not be set near to room heating equipment or direct sunlight.
[][]Use mask, gloves and safety goggles during handling the Karl Fischer reagent and methanol under Fume Cupboard.
[][]Do not change stirring speed between the pre-titration and the titration.
[][]Always take some more volume of liquid sample by a syringe and then inject the desired volume.
[][]Clean and dry syringes and needles before use. Rinse the syringe with the sample solution itself 2 – 3 times and then take the test sample. This will remove the moisture from syringe if any.
[][]While testing various samples of which the moisture contents are roughly known, test the sample having lowest moisture first and then go on to the next in order to avoid contamination.
[][]If moisture content of samples are unknown and very small sample to obtain pilot reading and then adjust the size of sample accordingly. Keep next sample ready and if some time is lapsed between two titrations. Press START, get to the end point then add sample immediately. This will eliminate the error due to lapse of time.
[][]If fresh KF reagent is added to the old stock in KF reservoir, mix the solution in reservoir properly and recalibrate the reagent for new factor.
[][]Keep the titration cell tightly closed with stopper and only open for an instant to add sample fast.
[][]When renewing the reagents, clean the titration cell thoroughly with methanol (or another suitable solvent) and may be dried in an even at approximately 70⁰C.
[][]Adjust the filling rate of dispensing burette to avoid the introduction of air bubbles in the burette.
Operation:
[][]Check the cleanliness of the instrument.
[][]Check the calibration status of the Karl Fischer Titrator.
[][]Check the clarity and color of the titrant.
[][]Switch ON the instrument. The instrument always performs a self-test before the display of the Titrator name appears.
Functional description:
[][]The control panel consists of an integrated touch screen and four additional keys, which are located next to the touch-sensitive surface of the display.
[][]Reset, the current task is aborted Info, calls to the online help for the current contents of the current dialog.
[][]Home, always returns to the Home screen (the blue Home keys are located at the bottom right and left of the touch screen).
Rinse and fill burette:
[][]To fill the burette and tubes with titrant and remove any air bubbles from the system, the burette should be rinsed three times with titrant. To do that, use the manual operation “Rinse burette”. Press Home if the home screen is not already displayed.
[][]Select the Manual button to open the Manual operations dialog and press Burette button.
[][]In the Burette dialog, use the Rinse button to access the parameters for the rinse process.
[][]Select the relevant titrant.
[][]For the “Cycles” parameter, enter “3” for three rinse cycles.
[][]Press Start to start the rinse procedure.
[][]When all rinse procedures will be completed, use the ok button to return to the Rinse dialog. The burette should be filled and the hoses should be free of air bubbles.
Filling the titration beaker:
[][]To fill the titration beaker with solvent, the solvent manager must be attached to the solvent bottle.
[][]In the Pump dialog (Home>Manual>Pump), select the “Fill” value for the “Action” parameter.
[][]The “Reset counter” parameter will be activated.
[][]Press Start.
[][]Titration beaker will be filled with solvent.
Performing a volumetric KF titration:
[][]Fill dried Methanol in glass vessel.
[][]In the Home screen, use the Methods button and select the method type “KF vol”. In the subsequent dialog, select the “Mix Time” and enter required time.
Select start button.
[][]Start analysis dialog will be displayed. In this dialog select Number of sample and put “3” and then press Ok.
[][]Select Start button. The system will perform a pre-titration as a basis for a water-free solvent.
[][]As soon as the continually determined drift value falls below a regulated required value, the system automatically switches to Standby mode. In the Standby mode the Start Concentration button will be activated.
[][]Press the Start Concentration button, weigh about 10 mg of purified water as a standard and add into the titration vessel and then enter the sample weight.
[][]Press Sample ID and put the sample ID.
[][]Confirm with Ok. The analysis will be started automatically.
[][]Perform 3 samples analysis and press Result>Statistic>Print.
[][]Average water content and relative standard deviation (RSD) of 3 samples will obtain on the print out.
[][]Standard value of RSD is not more than 2%.
[][]Press Reset and select start button.
[][]Start analysis dialog will be displayed.
[][]When Start button will be selected in the Start analysis dialog, the system first always performs a pre-titration as a basis for a water-free solvent.
[][]As soon as the continually determined drift value falls below a regulated required value, the system automatically switches to Standby mode. In the Standby mode the Start sample button will be activated.
[][]Press the Start sample button, add the sample and then enter the sample weight.
[][]Press Sample ID and put the sample ID.
[][]Confirm with Ok. The analysis will be started automatically.
[][]After completing titration, the Result dialog will be displayed and printed automatically.
Calibration:
[][]Fill dried Methanol in glass vessel.
[][]Select start button.
[][]Start analysis dialog will be displayed. In this dialog select Number of sample and put “3” and then press Ok.
[][]Select Start button. The system will perform a pre-titration as a basis for a water-free solvent.
[][]As soon as the continually determined drift value falls below a regulated required value, the system automatically switches to Standby mode. In the Standby mode the Start Concentration button will be activated.
[][]Press the Start Concentration button, weigh about 100 mg of Di-sodium tartrate dihydrate as a standard and add into the titration vessel and then enter the sample weight.
[][]Press Sample ID and put the sample ID.
[][]Confirm with Ok. The analysis will be started automatically.
[][]Perform 3 samples analysis and press Result>Statistic>Print.
[][]Average water content and relative standard deviation (RSD) of 3 samples will obtain on the print out.
[][]Standard value of RSD is not more than 1%.
[][]Record the result in the “Calibration Information Sheet for Karl Fischer Titrator” as per Annexure-I.
[][]Affix the label “CALIBRATED” on the instrument if all test results are satisfactory. If the calibration result is out of limit or any discrepancy is during calibration, affix “UNDER Maintenance” label and inform the respective supplier.
[][]Calibrate the instrument once in every six month.
Cleaning:
[][]After completion of the testing, press Drain>Start button for removing the solution from the test compartment and wash with methanol which is used for water determination. Wipe the knob of sample compartment with tissue paper.
[][]Switch ‘OFF’ the instrument and switch ‘OFF’ the mains.
[][]If the drift of the KF solution remains too high, fill the drying tubes with fresh molecular sieve or regenerate molecular sieve in a drying oven at 105 – 150⁰C for at least 24 hrs. Before regeneration rinse the molecular sieve used on the waste bottle with purified water as it contain SO2.
[][]Collect the waste solution into waste beaker at the same time all waste to be thrown to avoid corrosion.
[][]Clean the outer surface of the instrument with Isopropyl alcohol and dry it with tissue paper.
Annexure
Annexure-I: Calibration Information Sheet for Karl Fischer Titrator.
Annexure-II: Operation logbook for Karl Fischer Titrator.