Using colored pH Buffer solution for probe calibration?

[JordanM]

I have some Fisher 4,7 and 10 pH buffer solution. These have color added to them. Are they fine to use to calibrate the pH probe? I also have a pH 4 that does not have color added to it. I already have my probes calibrated with the Neptune solutions so i may just stick a probe in and see if it reads the solution accurately.
https://www.fishersci.co.uk/shop/pr...thalate-red-nist-standard-solution-2/10427260

 

[LobsterOfJustice]

Yes it’s fine.

 

[redfishbluefish]

Yes, fine to use....and you only use two calibration solutions to calibrate.

For measuring acids.....use 4 and 7
For measuring bases....use 7 and 10

 

[JordanM]

Thanks. Yes I will need the 4 and 7 for the calcium reactor and 7 and 10 for the tank.

 

[JordanM]

So i just checked it against the Neptune calibration pH and in the neptune solution it reads 10.0, in the fisher buffer it reads 10.1. In the neptune solution I get 6.98 and in the fisher buffer i get a reading of 7.03. Are these values within tolerance to use the Fisher buffer and what one do you think is actually the better one to calibrate against? I am guessing the Fisher might actually be a little more accurate as this is meant to calibrate lab instruments.

 

[Reef of Fillory]

So i just checked it against the Neptune calibration pH and in the neptune solution it reads 10.0, in the fisher buffer it reads 10.1. In the neptune solution I get 6.98 and in the fisher buffer i get a reading of 7.03. Are these values within tolerance to use the Fisher buffer and what one do you think is actually the better one to calibrate against? I am guessing the Fisher might actually be a little more accurate as this is meant to calibrate lab instruments.

I don't see any issues with that range, pH monitoring should be used as an indicator of something going wrong rather than a magic number anyway. As long as things are consistent and in an acceptable range, there shouldn't be any issues