Expert Advice Community

Guest

Question about pH meter

  Quote
Guest
Guest user Created:   Nov 23, 2022 Last commented:   Nov 23, 2022

Question about pH meter

Hi, we have  pH meter *** and we need to use flouride  ion selective electrode  by using  the ***  ,  could  you provide us flouride  calibration method  or procedure and how to setup the electrode ,that because when I caibrated the flouride  ion selective electrode meter ,after calibratiin the meter gave  me  a wrong value for the reference stanadard  , even when  I used  one of  the standard which was used in calibration .

0 0

Assign topic to the user

ISO 17025 DOCUMENTATION TOOLKIT

Step-by-step implementation for smaller companies.

ISO 17025 DOCUMENTATION TOOLKIT

Step-by-step implementation for smaller companies.

Expert
Tracey Evans Nov 23, 2022

There are four possible components that could be the issue, namely the meter, ion selective electrode, application (including sampled) and the technique. To troubleshoot, I suggest you contact the supplier and ensure you have the manual and handling instructions for both the meter and electrode. Then work systematically to isolate the problem
You can refer to the ASTM D1179-16(2021)e1 Standard Test Methods for Fluoride Ion in Water or EPA method SW-846 Test Method 9214: Potentiometric Determination of Fluoride in Aqueous Samples with Ion-Selective Electrode, for a method, including the principle of calibration. 
See here https://www.astm.org/d1179-16r21e01.html and https://www.epa.gov/hw-sw846/sw-846-test-method-9214-potentiometric-determination-fluoride-aqueous-samples-ion

Quote
0 1

Comment as guest or Sign in

HTML tags are not allowed

Nov 23, 2022

Nov 23, 2022

Suggested Topics

Guest user Created:   Jan 20, 2023 ISO 17025
Replies: 1
0 0

ISO 17025 audit

Kristyna Created:   Dec 16, 2022 ISO 17025
Replies: 1
0 0

17025 or GMP of the testing lab?

Guest user Created:   Nov 29, 2022 ISO 17025
Replies: 1
0 0

Implemention of ISO 17025