Journal article

FLOW-INJECTION TECHNIQUE FOR THE DETERMINATION OF LOW-LEVELS OF PHOSPHORUS IN NATURAL-WATERS

PR FREEMAN, ID MCKELVIE, BT HART, TJ CARDWELL

ANALYTICA CHIMICA ACTA | ELSEVIER SCIENCE BV | Published : 1990

Abstract

An inexpensive flow-injection instrument for determining low concentrations of dissolved reactive phosphorus in natural waters is reported. The unique feature is the use of an inexpensive detector consisting of a flow cell and a simple photometer that incorporates a super-bright light-emitting diode as the source and a photodiode as the detector. The tin(II) chloride-molybdate method was optimized using a modified simplex optimization method. Silicate interference up to 5 mg Si l-1 was removed by addition of 0.10% (w/v) tartaric acid. Using the tartaric acid-modified optimized reagents, a detection limit of 0.6 μg P l-1 was achieved. The method was linear over the range 0-100 μg P l-1 with a..

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University of Melbourne Researchers