Required quality of water used in Accuracy of drying test mentioned in this SOP for calibration of Halogen Moisture Analyzer


(Dr. Ahmed Mohamed Awad) #1

What is the required quality of water used in Accuracy of drying test mentioned in this SOP for calibration of Halogen Moisture Analyzer ?

Is Purified water sufficient or must be Distilled water ?


(Dr. Ahmed Mohamed Awad) #2

Also ,

2- What is the drying temperature for this Accuracy of drying test?

3- What is the drying time ?

4- Isn’t 0.2 g of water too small for the test, my information is that many moisture analyzers have minimum sample weight of 0.5 g , also my information that using such small sample weights reduces repeatability of moisture content test results (increases random error) ?


(Ankur Choudhary) #3
  1. You should use distilled water but purified water will not have a considerable effect on results.
  2. Where is it in SOP?
  3. Where is it in SOP?
  4. Most of the moisture balance has 0.000 gm display and has 1 mg least count. There is no problem to take 0.2 gm sample for analysis.

(Dr. Ahmed Mohamed Awad) #4

2- Accuracy of drying test in the SOP does not specify drying temperature.

3- Accuracy of drying test in the SOP does not specify drying time.

4- My little experience with moisture balances which have 1 mg least count that they show error message after pushing the start button if original sample weight is less than 0.5 g