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DI water quality vs. Resistivity

Hello,

I'm looking for a graphical relationship of DI water relative to resistivity. I'm asking for this to show our customer the relationship of resistivity measured in megaohms given a balanced total ionic/cationic condition measured in PPB. I was told the relationship is PPB= 3/megohms, and wondering if a graph like this is available publicly.

Thanks,

Dave Allan White
Disk Drives - Scotts Valley, California, USA
2004

2004

The relationship of resistivity vs. concentration varies depending upon the ionic species present. This is due to the fact that some ions diffuse faster than others.

Here are a few data points for 25 degree C water.

Resistivity     NaCl      NaOH      HCl in Meg-Ohm-cm
 
1.0             400 ppb   200 ppb   130 ppb
 
5.0              80 ppb    30 ppb     20 ppb

Lyle Kirman
consultant - Cleveland Heights, Ohio

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