A PORTABLE FLOW INJECTION ANALYZER FOR THE IN SITU DETERMINATION OF FILTERABLE REACTIVE PHOSPHORUS (FRP) IN FRESHWATER |
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| Authors: | Utra Mankasingh Paul J. Worsfold |
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| Affiliation: | 1. School of Earth, Ocean and Environmental Sciences, University of Plymouth , Drake Circus, Plymouth, UK utra.mankasingh@bristol.ac.uk;3. School of Earth, Ocean and Environmental Sciences, University of Plymouth , Drake Circus, Plymouth, UK |
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| 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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| Keywords: | eutrophication flow injection filterable reactive phosphorus freshwater in situ analyzer molybdenum blue phosphorus |
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