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ACS Carbonate test standard

We were trying to perform the ACS carbonate test on ammonium sulfide, and we are a little confused about the standard prep. It says that it's a carbonate standard, but in parenthesis, it says "0.2 mg/mL CO2". So we are wondering if that is a typo and if it's actually supposed to be 0.2 mg/mL CO3?

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