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High temporal resolution field monitoring of phosphate in the River Frome using flow injection with diode array detection

High temporal resolution field monitoring of phosphate in the River Frome using flow injection with diode array detection
High temporal resolution field monitoring of phosphate in the River Frome using flow injection with diode array detection
The design and deployment of an in situ flow injection (FI) monitor for high temporal resolution monitoring of phosphate in the River Frome, Dorset, UK, is described. The monitor incorporates solenoid, self-priming micropumps for propulsion, solenoid-operated switching valves for controlling the fluidics and a miniature CCD spectrometer for full spectrum (200-1000 nm) acquisition and operates in a graphical programming environment. A tangential filtration unit is attached to the sample inlet line to remove suspended particulate matter and prevent blockage of the micropumps and valves. Detection (at 7 10 nm) is based on molybdenum blue chemistry with tin(II) chloride reduction. The detection limit is 0.67 muM PO4 and the linear range can be adjusted by using different wavelengths for detection. Pump noise is eliminated by subtraction of the signal at a non-absorbing wavelength (447 nm). Data from an intensive (sample every 30 min) field trial on the River Frome performed in October 2000 are presented, and the implications of the data for refining an export coefficient model for phosphorus from the catchment are discussed.
reactive phosphorus, land-use, waters
0003-2670
55-62
Hanrahan, G.
8855bf4b-393d-461c-b407-7a8b3a294935
Gledhill, M.
da795c1e-1489-4d40-9df1-fc6bde54382d
Fletcher, P.J.
38ba600f-ae3c-45d4-8cf2-f6e4bbe8539d
Worsfold, P.J.
2edcddc5-ce8e-4f9f-8628-216a26921979
Hanrahan, G.
8855bf4b-393d-461c-b407-7a8b3a294935
Gledhill, M.
da795c1e-1489-4d40-9df1-fc6bde54382d
Fletcher, P.J.
38ba600f-ae3c-45d4-8cf2-f6e4bbe8539d
Worsfold, P.J.
2edcddc5-ce8e-4f9f-8628-216a26921979

Hanrahan, G., Gledhill, M., Fletcher, P.J. and Worsfold, P.J. (2001) High temporal resolution field monitoring of phosphate in the River Frome using flow injection with diode array detection. Analytica Chimica Acta, 440 (1), 55-62. (doi:10.1016/S0003-2670(00)01395-7).

Record type: Article

Abstract

The design and deployment of an in situ flow injection (FI) monitor for high temporal resolution monitoring of phosphate in the River Frome, Dorset, UK, is described. The monitor incorporates solenoid, self-priming micropumps for propulsion, solenoid-operated switching valves for controlling the fluidics and a miniature CCD spectrometer for full spectrum (200-1000 nm) acquisition and operates in a graphical programming environment. A tangential filtration unit is attached to the sample inlet line to remove suspended particulate matter and prevent blockage of the micropumps and valves. Detection (at 7 10 nm) is based on molybdenum blue chemistry with tin(II) chloride reduction. The detection limit is 0.67 muM PO4 and the linear range can be adjusted by using different wavelengths for detection. Pump noise is eliminated by subtraction of the signal at a non-absorbing wavelength (447 nm). Data from an intensive (sample every 30 min) field trial on the River Frome performed in October 2000 are presented, and the implications of the data for refining an export coefficient model for phosphorus from the catchment are discussed.

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More information

Published date: 1 August 2001
Keywords: reactive phosphorus, land-use, waters

Identifiers

Local EPrints ID: 37744
URI: http://eprints.soton.ac.uk/id/eprint/37744
ISSN: 0003-2670
PURE UUID: 3c0b96ef-9dfa-4bf8-b367-ac264fd18061

Catalogue record

Date deposited: 25 May 2006
Last modified: 15 Mar 2024 08:01

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Contributors

Author: G. Hanrahan
Author: M. Gledhill
Author: P.J. Fletcher
Author: P.J. Worsfold

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