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† Conductivity at 25°C with dissolved CO2 removed from
distillate. Any ultra pure water in contact with the atmosphere has a
conductivity of 1-2 µs/cm and pH ˜5, due to a small amount of CO2
(0.5ppm) absorbed from the atmosphere. Deionizers and similar systems
measure conductivity before the water contacts the atmosphere and
absorbs CO2 (during collection and use). As distillates are
already open to the atmosphere before measurements can be made, it is
necessary to remove this CO2 to provide a comparable
conductivity value.
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