Determination of nanomolar concentrations of phosphate in freshwaters using flow injection with luminol chemiluminescence detection

Yaqoob, Mohammad; Nabi, Abdul; Worsfold, Paul J.

doi:10.1016/j.aca.2003.12.070

Cited by 78 publications

(39 citation statements)

References 24 publications

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“…13 This method is widely used as an analytical tool for many applications, such as analyses of a variety of trace metals and other substances. 7,[14][15][16][17] Numerous analytical techniques have been employed in the determination of heavy and transition metals, but ion chromatography seems to be one of the most effective and simple techniques to determine both anionic and cationic species, owing to its high separation efficiency and selectivity, and probable simultaneous determination of different oxidation states of the same element via flow injection analysis (FIA). The eluent commonly used for this application is oxalic acid or pyridine-2,6-dicarboxylic acid (PDCA).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Speciation of Iron(II) and Iron(III) by Ion Chromatography with Chemiluminescence Detection

et al. 2012

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This study reports on a method for the speciation of iron in aqueous samples by the simultaneous analysis of divalent and trivalent iron ions with ion chromatography equipped with chemiluminescence detection (IC-CLD). Ferrous and ferric ions are first chelated by pyridine-2,6-dicarboxylic acid (PDCA) to form complexed anions, and separated by a mixed-bed ion-exchange column. The separated complexed ions are then detected with a CLD system containing luminol and hydrogen peroxide in a basic solution. This luminescence system has a linear dynamic range of ca. 3 orders of magnitude, with method detection limits as low as 7 μg L -1 for Fe(II) and 3 μg L -1 for Fe(III), measured in the simultaneous detection mode. This system resists interferences from common cations such as Cd, Ca, Cr, Cu, Mg, Ni, Pb, and Zn. Evaluation by analyzing real samples shows that this method is rapid, accurate, sensitive, and selective.

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Section: Introductionmentioning

confidence: 99%

Simultaneous Speciation of Iron(II) and Iron(III) by Ion Chromatography with Chemiluminescence Detection

et al. 2012

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“…HPAs have been extensively used in analytical chemistry for determination and removal of metal ions like phosphates (49,(53)(54)(55), arsenates (55)(56)(57)(58), arsenic (57)(58)(59)(60)(61)(62)(63)(64), silicates (65)(66)(67)(68), and many other ions (69, 70) from aqueous solutions. They have also other applications in aqueous systems (71).…”

Section: Hpa-water Systemmentioning

confidence: 99%

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

Heravi

Fard

Faghihi

2013

Green Chemistry Letters and Reviews

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The organic reactions in water, as the most significant green solvent, have attracted much attention due to their unique properties over conventional organic ones. In the catalytic area, heteropoly acids (HPAs) are also promising green solid acids to replace environmentally harmful liquid acid catalysts. Herein, we wish to report the organic reactions catalyzed by HPAs, their salt, and polyoxometalates (POMs) in aqueous systems.

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“…Another technique relies on expensive instruments such as laser-induced thermal lensing (Fujiwara et al 1982) and HPLC (Haberer and Brandes 2003), which again are not feasible for direct shipboard measurements. Using chemiluminescence detection (Yaqoob et al 2004) and microsequential injection (Wu and Ruzicka 2001), highly sensitive determination of phosphate in fresh water samples have been achieved, but to the best of our knowledge, these methods have not been successfully applied to oceanographic studies. The most feasible method for nanomolar phosphate determination is long-path spectrophotometry (Lei et al 1983;Ormaza-Gonzalez and Statham 1991;Zhang and Chi 2002).…”

Section: Introductionmentioning

confidence: 99%

Underway monitoring of nanomolar nitrate plus nitrite and phosphate in oligotrophic seawater

Hansell

Zhang

2008

Limnology & Ocean Methods

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To study nutrient dynamics and cycling in oligotrophic open ocean environments, continuous measurements of nanomolar nitrate, nitrite, and phosphate are valuable. However, such studies are usually impeded by the detection limits of conventional nutrient-sensors and analyzers. Here, we developed a shipboard deployable underway system for simultaneously monitoring nitrate plus nitrite and phosphate at nanomolar concentrations by the coupling of an optimized flow injection analytical system with two long-path liquid waveguide capillary cells (LWCC). The detection limits are ~2 nM for nitrate plus nitrite and ~1.5 nM for phosphate, respectively. Results from realtime surveys of waters over the west Florida continental shelf and the oligotrophic Sargasso Sea are presented. This system has also been successfully used to analyze more than 1000 discrete seawater samples manually during 2 cruises in the North Atlantic.

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Determination of nanomolar concentrations of phosphate in freshwaters using flow injection with luminol chemiluminescence detection

Cited by 78 publications

References 24 publications

Simultaneous Speciation of Iron(II) and Iron(III) by Ion Chromatography with Chemiluminescence Detection

Simultaneous Speciation of Iron(II) and Iron(III) by Ion Chromatography with Chemiluminescence Detection

Heteropoly acids-catalyzed organic reactions in water: doubly green reactions

Underway monitoring of nanomolar nitrate plus nitrite and phosphate in oligotrophic seawater

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