查到国外试剂配制有此说明： Carbon Dioxide-Free Water. Carbon dioxide-free water can be prepared by purging reagent water with carbon dioxide-free air (using a gas dispersion tube) or nitrogen for at least 15 min or by boiling reagent water vigorously for at least 5 min and allowing it to cool while protected from absorption of carbon dioxide from the atmosphere; alternatively, fresh 18-M deionized water can be used.
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