Determination of total nitrogen in seawater by ion chromatography using a high-capacity anion exchange column and a UV-detector.

Nakamura, Eiko; Inoue, Junko; Namiki, Hiroshi

doi:10.2116/bunsekikagaku.45.711

Cited by 7 publications

(7 citation statements)

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“…The RSDs were not larger than 1.5%. The RSDs of the peak area for bromide, nitrite, and nitrate were smaller than the RSDs of 2.7, 2.8 e ions and 1.6%, respectively, obtained by Nakamura et al [2].…”

Section: Effect Of Bromide Ion In the Carrier Solutioncontrasting

confidence: 69%

“…The concentrations for bromide ion shown in Table 4 are a little lower than those obtained by Nakamura et al [2], 68.8±71.5 mg/L, and were much lower than those obtained by Gennaro et al [1], 74.6±166.5 mg/L. It is known that the concentration of bromide ion in seawater is 68 mg/L [15].…”

Section: Analysis Of Artificial Seawater and Seawater Samplesmentioning

confidence: 58%

“…Chloride, iodide, bromide, sulfate, nitrite, and nitrate ions in lagoon water was determined by Gennaro et al [1] by means of ion-interaction chromatography with UV detection. Determination of nitrite, nitrate, and bromide ions in seawater was performed by ion chromatography (IC) using a high-capacity anion exchange column with a high concentration of sodium chloride solution as the eluent by Nakamura et al [2]. Recently, capillary zone electrophoresis (CZE) has been proposed for the analysis of inorganic ions in sample solutions containing high concentrations of salts, such as seawater.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous determination of bromide, nitrite and nitrate ions in seawater by capillary zone electrophoresis using artificial seawater as the carrier solution

et al. 2000

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Section: Effect Of Bromide Ion In the Carrier Solutioncontrasting

confidence: 69%

Section: Analysis Of Artificial Seawater and Seawater Samplesmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous determination of bromide, nitrite and nitrate ions in seawater by capillary zone electrophoresis using artificial seawater as the carrier solution

et al. 2000

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“…As reported by Nakamura et al, 22 an ion exchanger with high capacity is advantageous because it enables the direct injection of seawater. In the present work, a SAX column and chloride eluent were used for determining nitrate in seawater.…”

Section: Effect Of Counter Cations In the Eluentmentioning

confidence: 95%

“…Ito et al [19][20][21] coated an ODS bed with long-chained tetraalkylammonium to increase the ion-exchange capacity for direct injection and the determination of nitrate and other anions in seawater. Nakamura et al 22,23 successfully used a highcapacity ion exchanger (SAX, Tosoh) and sodium chloride eluent to measure the total nitrogen content in seawater as nitrate after oxidation by peroxybisulfate. In this method, it was not necessary to coat the ion exchanger or dilute the seawater samples.…”

Section: Introductionmentioning

confidence: 99%

Onboard Determination of Submicromolar Nitrate in Seawater by Anion-Exchange Chromatography with Lithium Chloride Eluent

2006

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Nitrogen is an essential element for phytoplankton growth in aquatic environments. Nitrate is the main nutrient supporting this production in the open ocean, and the supply of nitrate often controls primary production in oligotrophic areas. Excluding the high-latitude and eastern equatorial regions of the Pacific, the surface waters of the North and South Pacific Ocean from about 40˚ N to 40˚ S are relatively depleted in nitrate. In the North Pacific subtropical gyre, nitrate concentrations are typically below 10 nmol/l.1 To understand the nitrogen cycles in the open ocean ecosystem, a sensitive analytical method to determine the nanomolar levels of nitrate in seawater is essential.The standard method of nitrate determination in seawater is based on a flow-injection technique with spectrophotometric detection. [2][3][4] In this method, nitrate is first reduced to nitrite in a copperized cadmium column.Nitrite is coupled with sulfanilamide to form a diazonium cation. This diazonium reacts with N-1-naphtylethylenediamine dihydrochloride, forming a purple azo dye whose absorbance is measured at 550 nm. Next, the nitrite is measured independently according to the same method without reduction. Nitrate is then calculated from the difference in the concentration between [nitrate + nitrite] and nitrite. This method can be conventionally applied to the determination of nitrate and nitrite on board; its detection limit is about 50 nmol/l as [nitrate + nitrite].A more sensitive method of nitrate analysis has been developed by utilizing the chemiluminescence of nitrogen monoxide. [5][6][7] In this method, both nitrate and nitrite are reduced to nitrous oxide in a highly acidic solution of sulfuric acid containing iron(II) ammonium sulfate and ammonium molybdate. Nitrous oxide in the solution is carried to a drying tube and reacts with ozone, resulting in chemiluminescence. The detection limit is around 2 nmol/l. This measurement method also requires nitrate reduction to nitrite. By this method, Cavender-Bares et al. 8 measured 2 to 10 nmol/l concentrations of [nitrate + nitrite] in surface seawater that were below the detection limit of the standard method using azo dye formation. They revealed the vertical gradients of [nitrate + nitrite] in the North Atlantic Ocean.As a simple method, direct UV determination 2,4,9 has also been examined, but often encounters interference by bromide or organic compounds, such as humic substances, which also have UV absorbance in a wavelength range similar to that of nitrate. Capillary electrophoresis 10,11 is very useful because it gives high efficiency in the separation of analytes, and enables rapid analysis and the direct injection of seawater. However, the small injection volume and short path length of the detector results in a poor detection limit for nitrate and nitrite.Ion chromatography (IC) 12 is advantageous in the determination of nitrite and nitrate because these anions can be separated from other ions, such as bromide and organic substances. However, with highly ionic mat...

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Ion chromatography for determination of nitrite and nitrate in seawater using monolithic ODS columns

Ito

Takayama

Makabe

et al. 2005

Journal of Chromatography A

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Determination of total nitrogen in seawater by ion chromatography using a high-capacity anion exchange column and a UV-detector.

Cited by 7 publications

References 0 publications

Simultaneous determination of bromide, nitrite and nitrate ions in seawater by capillary zone electrophoresis using artificial seawater as the carrier solution

Simultaneous determination of bromide, nitrite and nitrate ions in seawater by capillary zone electrophoresis using artificial seawater as the carrier solution

Onboard Determination of Submicromolar Nitrate in Seawater by Anion-Exchange Chromatography with Lithium Chloride Eluent

Ion chromatography for determination of nitrite and nitrate in seawater using monolithic ODS columns

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