| Subject | English | Portuguese |
| chem. | complexing agent | complexante |
| environ. | complexing agent A substance capable of forming a complex compound with another material in solution | agentes complexantes |
| chem. | complexing agent | agente complexante |
| chem. | organic complexing agent | agente orgânico de complexação |
| chem. | selective complexing agent | complexante seletivo |