A simple manifold flow injection analysis (FIA) for determining phosphorus in presence of arsenate in water, by the on-line reduction of As(V) to As(III) using sodium sulphite. The FIA method is applicable for the determination of phosphorus in water samples containing less than 0,37 <$E mu roman g> mL<^>-1 of AsO4<^>3-. A solution obtained by mixing 6,30 g of Na2SO3 (1 M), 5,0 ml H2SO4 18 M completed up to 50 ml with deionized distilled water was used to reduce on line As(V) to As(III), using a reactor of 0,30 m. The limit of detection is <$E roman {0,05584~symbol С~0,00167~mu g~cdot~mL sup -1}> P - PO4<^>3- and sampling frequency is 45 samples per hour. It is a simple and low cost methodology, easily applicable in the determination of phosphorus in samples of water contaminated with arsenate.

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