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• W2085245822 endingPage "37" @default.
• W2085245822 startingPage "37" @default.
• W2085245822 abstract "A method using flow-injection, gas-diffusion, derivatisation and then fluorescent detection has been established for ammonium ion determination in seawater. The fluorescent derivative formed by reacting ortho-phthaldialdehyde (OPA) and sulfite with ammonia gives high sensitivity while removing potential interferences. This is required to measure the low concentrations of ammonium often seen in the open ocean. The experimental conditions (flow-rate, reagent concentrations, membrane configurations, etc.) were manipulated to improve performance. For a sample throughput of 30 samples h−1, the limit of detection was 7 nM, the coefficient of variation was 5.7% at 800 nM, and the calibration curve was linear to at least 4 μmol L−1. Interferences were minimised by a gaseous diffusion step. Volatile small molecular-weight amines as interferents were discriminated against by this method. They neither passed through the membrane as efficiently as ammonia, nor reacted as readily with OPA when sulfite was the reductant. Contamination by ammonia from laboratory and shipboard sources complicates application of the method to natural waters, especially measurement of low concentrations (<100 nM) in open-ocean waters. Steps to overcome contamination are described in detail. Some results are presented for ammonium determination in Southern Ocean and Huon Estuary (Tasmania) waters." @default.
• W2085245822 created "2016-06-24" @default.
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• W2085245822 creator A5049938153 @default.
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• W2085245822 date "2005-01-01" @default.
• W2085245822 modified "2023-10-16" @default.
• W2085245822 title "Flow-injection analysis with fluorescence detection for the determination of trace levels of ammonium in seawater" @default.
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• W2085245822 doi "https://doi.org/10.1039/b405924g" @default.
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