The slave ship Mercantil arrived with enslaved Africans in Brazil. About 743 people had been taken aboard and approximately 683 arrived.

Vessel: Mercantil; flag: Portugal / Brazil; rig: Galera. People recorded in connection with the voyage: Captain: Santos, Joaquim Ferreira dos; Investor: Santos, Joaquim Ferreira dos; Captain: Rodrigues, Francisco de Paula. The voyage began at Rio de Janeiro on 12 March 1821. Principal recorded place where captives were acquired: Luanda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 25 days. Estimated mortality during the crossing: 8.0%. Recorded outcome: Voyage completed as intended.