| Using a flow injection analysis method for measurement of filterable reactive phosphorous ( FRP , the so called inorganic fraction ) and filterable organic phosphorous ( FOP ) , it was found that rapid releases of both FOP and FRP occurred at salinities of > / =10 per thousand . ^^^ Over the 4 day experimental period , sediment release increased the filterable P concentration by approx . 50 microgL ( 1 ) , and of this , nearly half was initially present as FOP , which subsequently underwent rapid mineralisation to FRP . ^^^ |