PH on ICP test

[bryznsreef]

Hey quick question, does anyone know how accurate PH is on an ICP test? I figured that the measured value is lower than what it actually was, but am unsure if using the tightly sealed/capped container keeps the PH roughly the same

 

[Randy Holmes-Farley Verified Community Expert]

I would not trust a pH test on a sample that was closed up for days.