Nitrites also decrease the oxygen-carrying capacity of the blood by transforming hemoglobin, which transports oxygen, into methemoglobin, which does not. ###>Les nitrites diminuent Ã©galement le pouvoir oxyphorique du sang en transformant l'hÃ©moglobine (qui transporte l'oxygÃ¨ne) en mÃ©thÃ©moglobine (qui ne transporte pas l'oxygÃ¨ne).