Purging of CO2 during filling of ceftazidime

Why carbon dioxide is being used in purging while filling of API like ceftazidime?

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Ceftazidime for Injection BP vials contain a mixture of ceftazidime pentahydrate and sodium carbonate.
When constituted, this mixture provides a solution of ceftazidime sodium.
The sodium carbonate at a concentration of 118 mg/g of ceftazidime is admixed to
facilitate dissolution. Purging of carbon dioxide is done for stability of product.

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