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| Subject | English | Spanish |
| environ. | total organic carbon The amount of carbon covalently bound in organic compounds in a water sample | carbono orgánico total |
| life.sc., chem. | total organic carbon | carbono orgánico total |
| life.sc., chem. | total organic carbon concentration | carbono orgánico total |
| life.sc., chem. | total organic carbon content | carbono orgánico total |
| chem. | total organic solids in suspension | materia orgánica en suspensión |