Thank you for the presentation I wanted to know why is coulometric more sensitive than volumetric and can detect lower percentages of water in the sample, thanks.
Hi You're welcome! In volumetry, the iodine required for the titration is added using an iodine-containing titrant via a buret. In coulometry, the iodine is generated directly in the titration vessel using a generator electrode (oxidation of iodide). The amounts of iodine generated in coulometry are much smaller than the amounts of iodine added in volumetry. Therefore, coulometry is more sensitive than volumetry.
Hi Generally speaking, KF titrators require periodic checking of the reproducibility and correctness on the basis of Standard Operating Procedures (SOPs). If you are using a Metrohm instrument and need more information on how to do this, please get in touch with your local Metrohm organization, which you can find here: www.metrohm.com/en/country-chooser/ Best regards Metrohm International Headquarters
Hi, i would like to know about the types of reagent recommended , what happens if we use reagents intended for with diaphragm into cells without diaphragm . Does it have any implications? Does the properties of different reagent as any impact on without diaphragm cells being used?
Hi Paani, you will find a lot of useful information in our monograph Water determination by Karl Fischer Titration www.metrohm.com/en/products/8/0265/80265013.html Best regards Metrohm International Headquarters
hello, thank you very much for your informative and well explained online training.I have question if I can use common karl fischer reference vial water with know value of 0.10 mg/g to my coulometric and volumetric titration machine for performance test or calibration?
Hi Abu We recommend using the 0.1 mg/g water standard for performance tests of coulometric titrators. For volumetric titrators the water content of this standard is too low. Please use a 1 mg/g or 10 mg/g for performance tests or titer determinations. For more information, please check out our Karl Fischer FAQs: www.metrohm.com/en/support-and-service/kf-faq/ Best regards Metrohm International Headquarters
Our pleasure! If you would like to watch more webinars, make sure you check out our Webinar Center: www.metrohm.com/en/support-and-service/webinar-center/
Thanks for the presentation. Looking forward to more being uploaded!
Great presentation, loved it!
Glad you enjoyed it!
Waow. What a presentation. Very clear and extraordinary. On point and understandable
Thanks! We're happy you like it. BTW: You can find more recorded webinars in our Webinar Center: www.metrohm.com/en/service/webinar-center.html
Thank you for the presentation
I wanted to know why is coulometric more sensitive than volumetric and can detect lower percentages of water in the sample, thanks.
Hi
You're welcome!
In volumetry, the iodine required for the titration is added using an iodine-containing titrant via a buret.
In coulometry, the iodine is generated directly in the titration vessel using a generator electrode (oxidation of iodide).
The amounts of iodine generated in coulometry are much smaller than the amounts of iodine added in volumetry.
Therefore, coulometry is more sensitive than volumetry.
Pls let me know how to calibrate the coulometer
Hi
Generally speaking, KF titrators require periodic checking of the reproducibility and correctness on the basis of Standard Operating Procedures (SOPs). If you are using a Metrohm instrument and need more information on how to do this, please get in touch with your local Metrohm organization, which you can find here:
www.metrohm.com/en/country-chooser/
Best regards
Metrohm International Headquarters
@@MetrohmTV thank u
Hi, i would like to know about the types of reagent recommended , what happens if we use reagents intended for with diaphragm into cells without diaphragm . Does it have any implications? Does the properties of different reagent as any impact on without diaphragm cells being used?
Hi Paani,
you will find a lot of useful information in our monograph Water determination by Karl Fischer Titration www.metrohm.com/en/products/8/0265/80265013.html
Best regards
Metrohm International Headquarters
hello, thank you very much for your informative and well explained online training.I have question if I can use common karl fischer reference vial water with know value of 0.10 mg/g to my coulometric and volumetric titration machine for performance test or calibration?
Hi Abu
We recommend using the 0.1 mg/g water standard for performance tests of coulometric titrators. For volumetric titrators the water content of this standard is too low. Please use a 1 mg/g or 10 mg/g for performance tests or titer determinations.
For more information, please check out our Karl Fischer FAQs:
www.metrohm.com/en/support-and-service/kf-faq/
Best regards
Metrohm International Headquarters
Hello, For volumetric KF titrations, you mention the solvent should be at least 25% Methanol (or other alcohol). Is that 25% by weight or by volume?
Hi
It's 25% by volume.
Best regards
Metrohm International Headquarters
@@MetrohmTV Thank you!
Thank you very much
Our pleasure! If you would like to watch more webinars, make sure you check out our Webinar Center:
www.metrohm.com/en/support-and-service/webinar-center/
Good work
Thank you so much 😀