pH Validation for Water (ISO 17025)

DOIE1

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Hi all,
I've been tasked with re-validating pH measurement in water to ISO 10725 and am a little stumped. I've run plenty of chemistry validations where I follow the standard 2 tests per day over 11 days (for within batch and between batch results). This gives me enough information to calculate bias, precision, UCM etc.

But for pH I'm scratching my head as I don't know if I'm supposed to spike a natural water sample to get a specific pH or something (the chemistry end is a lot more straightforward with spiking a natural sample with a reference material) - but how does that work for pH?

If anyone has ever validated pH in drinking water, surface water etc for ISO 17025 I'd be really grateful for a few pointers on the direction to go
 
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