Abstract
The development and deployment of a portable flow injection analyzer for continuous, real-time monitoring of filterable reactive phosphorus (FRP) in the Tamar catchment is described. The optimized method can be used for the determination of FRP in freshwater systems (4–150 μg L−1 P) and is capable of sampling with high temporal resolution (up to 15 samples h−1). The analyzer, fitted with a pre-filter and an in-line membrane filter (0.45 μm, cellulose acetate), was used in situ (bank-side and shipboard deployment) to provide real-time FRP data and in the laboratory to determine FRP in freshwater samples. The portable FRP analyzer was reproducible (RSD < 5%; n = 3) over the range 4–150 μg L−1 P and accurate, achieving good agreement with a laboratory based air-segmented continuous flow analyzer reference method for a range of freshwater samples from the Tamar catchment in SW England.
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