It is posible to sublimate a given mass of solid CO2 from commercial dry ice at -78 degrees Celsius  in the presence of the necessary amount of an inert gas such as nitrogen in a closed system.

I think you are asking this wrt anaerobic cultivation of bacteria for which you need 85-10-5 (ratio for N, CO2 and H). If that is so, please use a premix gas cylider connected with a gauze that measures the amount of gas.

in case you are using three different cylinders for supply of each of these, use three different meters to be fixed for the supply of specific gas supply. Please contact your gas supplier for these gauzes and set ups.

Hope it helps

I am sorry to have misunderstood the question.

The answer may not be followed.

Sorry for inconvenience.