Karl Fisher Titration; running a direct injection test on a titrator
Running a direct injection test on a karl fisher titrator is fairly straight forward. You will need to draw your sample into your syringe, and then weigh it (e.g. the full syringe with sample). We recommend a 4 place analytical balance. Once you weigh the sample write down the number on a piece of paper- this will be weight#1. Then, depending on the karl fisher titrator that you are using you will need to press “start” and push the needle though a septa port on the vessel. The timing on pressing the start button and injecting the sample can be kind of tricky but you will get the hang of this the more you run tests. Make sure when you push the needle through the septa that the tip of the needle reaches down into the liquid (reagent). You want to make sure that when you press the syringe plunger you deliver ALL of the sample INTO the reagent (not above the liquid level where you might spray some of your sample against the vessel sides)- this will ensure that all of your sample mixes with the reagent and is “detected” by the detector electrode.
After all of the sample has been injected immediately pull the needle from the vessel septa port and go directly back to the analytical balance to re-weigh the empty syringe. Weigh the empty syringe and write that number down- this will be weight#2.
When the karl fisher titrator finishes and indicates that the test is complete the titrator should prompt you to enter weight#1 and weight#2. After inputing both weights the karl fisher titrator will calculate the results for you.
Hope this is helpful.
H
If you would like to see this process you can watch it here:
