Da bi se izognili izgubi občutljivosti za določanje As V z novo pretočno injekcijsko tehniko, ki jo povzroči krajši reakcijski čas v tem sistemu, se mora As V reducirati na As III po oksidacijski razgradnji.
To avoid a loss of sensitivity for the determination of As V with flow injection technique, caused by the short reaction time in this system, As V has to be reduced to As III after the oxidative decomposition.