Support : FAQ


KF reagent

Q.01 I want to purchase the KF reagent.

Ans.
The reagent retailers will deal with the order of Karl Fischer reagents and the inquiry about the cost and the delivery date. It is conducted on the page of the link of retailers.

Q.02 I want to obtain the material safety data sheet (MSDS) of the KF reagent.

Ans.
The MSDS is distributed at this site. If you register here, you will become possible to download in the page of MSDS.

Q.03 I want to obtain the study report (COA) of the KF reagent.

Ans.
The study report is distributed at this site. It can be downloaded in the page of the study report (COA).

Q.04 Warranty period of the KF reagent?

Ans.
The warranty period is the period after manufacture in the unopened condition as shown below. Actually, it is all right to use the KF reagent after these periods.
Reagents for coulometric titration method Anolyte/catholyte/electrolyte solutions 5 years
Titrant for volumetric titration method Titer of 1 mg 1.5 years
Titers of 3 mg, 5 mg and 10 mg 2 years
Dehydrating solvent for volumetric titration method Various 5 years
Water standard sample Water standard solution of 10 mg 5 years
Water standard solutions of 1 mg, 0.2 mg and 0.1 mg 3 years
Solid water standard sample 5 years
Related articles Standard water-methanol 3 years
The lot number shows the alphabets, A, B or C, the month of manufacture, 1, 2, 3, etc., and the first 2 digits of the figure show the year of manufacture (last 2 digits of the year).
Example) D05123 means the manufacture in April 2005.

Apparatus (moisture measuring system)

Q.01 The method and frequency of calibration of the moisture measuring system?

Ans.
For the measuring system, “calibration” is not necessary, but it is recommended to confirm the accuracy by measuring the standard sample.
In a volumetric titration method, it is important to determine the titer of titrant exactly. It is appropriate to calibrate the system at the time of changing the titrant and once about 2 weeks, but it is more reliable to confirm the accuracy before determination of the sample every day. In a coulometric titration method, the accuracy shall be confirmed by measuring the standard samples or water. In the presence of any abnormality, maintenance shall be conducted by cleaning the electrodes, or changing the reagent to obtain normal values.

Q.02 The method of cleaning when the electrode is contaminated?

Ans.
The detecting electrode shall be cleaned by wiping gently with a paper wiper. An extreme change in the distance between platinum electrodes or the way of polishing to scratch the electrode shall be avoided. If the cathode chamber (electrolysis cell) for coulometric titration method is contaminated, it shall be washed with solvents such as alcohols. If it is severely contaminated, it shall be washed gently with a toothbrush immersed in neutral detergent, rinsed gently with water and dried sufficiently. Attention shall be paid not to break the platinum wire.

Q.03 Is there any difference between the temperature set for water vaporizer and the actual temperature?

Ans.
The set temperature is accurate at the position of thermoelectric couple. Since this is not a thermal analyzer, however, it shall be understood that the set temperature is not strictly consistent with the sample temperature.

Q.04 oes the flow of the carrier gas influence on the value in the water vaporization method?

Ans.
It was confirmed that the flow within the normal range of use did not influence on the measured values.

Q.05 I want to purchase the moisture measuring system and equipments.

Ans.
The moisture measuring system is sold by Mitsubishi Chemical Analytech Co.,Ltd. The inquiry about the system is also received by this company.

Q.06 Trouble shooting when anodic solution becomes brown before end-point or dark brown at end-point in coulometric titration.

Ans.
To shorten an analysis time and/or gain more accurate results by cleaning an electrode tip when dehydration is not completed although Iodine exists sufficiently in excess or dehydration requires a longer time. Find this file.

Q.07 Trouble shooting when solvent becomes brown before end-point or dark brown at end-point in volumetric titration.

Ans.
To shorten an analytical time and/or gain more accurate results by cleaning an electrode tip, when dehydration is not completed although Iodine exists sufficiently in excess or dehydration requires a longer time. Find this file.

Q.08 How to validate Moisture Meter by using AQUAMICRON Water Standard.

Ans.
To validate Coulometric moisture meter by using AQUAMICRON Water Standard.
Find this file.

Water determination

Q.01 Why the count decreases during determination in a coulometric titration method?

Ans.
This event occurs when the “titration continuation time” is set and becomes lower than the BG level at the start of determination. An extremely low moisture level in the sample and an interfering reaction (oxidation of iodide) with oxidative substances are assumed.

Q.02 Is 100% of the moisture in the sample extracted in a volumetric titration method?

Ans.
It is desirable to dissolve the sample in a dehydrating solvent, but it is considered that the moisture in the sample can be extracted if it is not dissolved but dispersed uniformly. According to the sample, extraction may be insufficient in the cases of nonuniform liquid or large masses, but the moisture is generally extracted very quickly into dehydrating solvents.

Q.03 Why the value is different between the loss on drying method and the KF method?

Ans.
The circumstances are different according to the sample. If the value is higher in the loss on drying method, loss of substances other than the moisture due to heating is considered. If the value is higher in the KF method, it is considered that interference reactions may occur in the KF reaction. There is a measuring method to prevent interfering reactions. If you are not sure about this matter, please contact us.

Q.04 The precisions of analysis and the lower limits of quantification of coulometric titration method and volumetric titration method?

Ans.
Various factors, including the type of sample, the amount of moisture, the handling method of samples, the level of proficiency of operation and the conditions of apparatus and reagents, are involved in the precision of analysis and the lower limit of quantification. The measure of the performance of analysis is as shown below.
Measure of the amount of moisture (analytical value) and relative standard deviation
Coulometric titration
method
Relative standard deviation
(RSD)
Volumetric titration
method
Less than 100 ug 10% to within 30% Less than 1 mg
100 to 1000 ug Within 5% 1 to 5 mg
More than 1000 ug Within 3% More than 5 mg

Q.05 Operating suggestions for the measurement of trace moisture in plastics.

Ans.
Trace moisture measurement in plastics is one of the important inspection items. Careful operation is needed to protect dried plastics from being affected by moisture absorption. Find this file.

Q.06 Do you have any visual instructions for the beginner of KF measurement?

Ans.
It will help you to understand easily once you watch this instruction video.