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

Fukushi, Keiichi; Ishio, Nobuhiro; Urayama, Hideo; Takeda, Sahori; Wakida, Shin‐ichi; Hiiro, Kazuo

doi:10.1002/(sici)1522-2683(20000101)21:2<388::aid-elps388>3.0.co;2-q

Cited by 25 publications

(11 citation statements)

References 8 publications

(14 reference statements)

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“…Several capillary electrophoretic applications have been reported for the determination of anions in salty water samples [6,7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Direct determination of bromide ions in seawater by capillary zone electrophoresis using polyethyleneimine-coated capillaries

Kocatürk¹,

Öztekin

Erim

2003

Analytical and Bioanalytical Chemistry

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A rapid and simple capillary electrophoretic method was developed for the direct determination of bromide ion in seawater. We have found an effective method, based on the use of polyethyleneimine-coated capillaries and the addition of sodium chloride to the background electrolyte. The use of coated capillaries with a cationic polymer changes the direction of the electroosmotic flow in the capillary, which favors the migration speed of the bromide ion and enables the use of low salt concentrations in the separation electrolyte. Bromide ion in seawater can be determined within 2 min using this system and 20 mmol L(-1)NaCl-containing separation electrolyte. The detection limit for the bromide ion was 0.45 microg ml(-1). The method was applied to the determination of bromide ion in seawater samples collected from the Bosphorus and the Black Sea. Bromide contents in samples from 0 to 72 m depths varied between 33.2 and 72.8 mg L(-1) with a mean 3.0% RSD.

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“…Several capillary electrophoretic applications have been reported for the determination of anions in salty water samples [6,7,8,9,10,11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Direct determination of bromide ions in seawater by capillary zone electrophoresis using polyethyleneimine-coated capillaries

Kocatürk¹,

Öztekin

Erim

2003

Analytical and Bioanalytical Chemistry

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“…Woodland and Lucy [10] added a zwitterionic surfactant to the BGE for the separation of analytes from chloride matrix in artificial seawater. We have proposed the use of artificial seawater as the BGE for seawater analysis by CZE to eliminate the interference of high concentrations of salts in seawater [11][12][13]. As mentioned in the previous paper [13], artificial seawater seems to be superior as the BGE due to its own buffering action based on the dissociative equilibrium for carbonic and boric acids.…”

Section: Introductionmentioning

confidence: 99%

“…We have proposed the use of artificial seawater as the BGE for seawater analysis by CZE to eliminate the interference of high concentrations of salts in seawater [11][12][13]. As mentioned in the previous paper [13], artificial seawater seems to be superior as the BGE due to its own buffering action based on the dissociative equilibrium for carbonic and boric acids. While this BGE was applicable to various environmental waters as well as seawater, further improvement of the LODs was necessary for lower concentrations of nitrite and nitrate in environmental waters.…”

Section: Introductionmentioning

confidence: 99%

Determination of nitrite and nitrate in a proposed certified reference material for nutrients in seawater by capillary zone electrophoresis with artificial seawater as the background electrolyte using transient isotachophoresis

et al. 2002

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We describe a combination of selected ions as a terminating ion which is useful for transient isotachophoresis (ITP) in capillary zone electrophoresis (CZE) for the determination of nitrite and nitrate in seawater. In addition to 150 mM sulfate as the principal terminating ion, 10 mM bromate was added to a sample solution as the additional terminating ion. Artificial seawater containing 3 mM cetyltrimethylammonium chloride (CTAC) was adopted as a background electrolyte (BGE). The limits of detection (LODs) for nitrite and nitrate were 2.2 and 1.0 microg/L (as nitrogen), respectively. The LODs were obtained at a signal to noise ratio (S/N) of 3. The values of the relative standard deviation (RSD) of peak area for these ions were 1.9 and 1.4%. The RSDs of peak height were 1.7 and 1.9%, the RSDs of migration time 0.11%. The proposed method was applied to the determination of nitrite and nitrate in a proposed certified reference material for nutrients in seawater, MOOS-1, distributed by the National Research Council of Canada (NRC). The results almost agreed with the assigned tolerance interval.

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“…Sample pretreatment other than filtration was not necessary in our method for the determination of these anions in environmental waters, including seawater [7]. The sensitivity of CZE was not, however, sufficiently high for analysis of environmental waters.…”

Section: Introductionmentioning

confidence: 99%

Optimum conditions for effective use of the terminating ion in transient isotachophoresis for capillary zone electrophoretic determination of nitrite and nitrate in seawater, with artificial seawater as background electrolyte

Ishio

Fukushi

Michiba

et al. 2002

Analytical and Bioanalytical Chemistry

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We have examined transient isotachophoresis (ITP) conditions, e.g. the nature of the terminating ion, its concentration, and the injection procedure, to improve the limit of detection (LOD) for determination of nitrite and nitrate in seawater by capillary zone electrophoresis (CZE). Artificial seawater containing 3.0 mmol L(-1) cetyltrimethylammonium chloride (CTAC) was used as background electrolyte (BGE). After sample injection 600 mmol L(-1) acetate was separately injected into the capillary as the terminating ion for transient ITP. The LOD for nitrite and nitrate, obtained at a signal-to-noise ratio (S/N) of 3, were 15 and 7.0 microg L(-1) (as nitrogen), respectively. Relative standard deviations (RSD) of peak area for nitrite and nitrate were 7.3 and 0.8%, respectively, and the RSD of peak height were 5.7 and 1.2%, respectively, when the concentrations of nitrite and nitrate were 0.05 and 0.25 mg L(-1). The RSD of migration time for these ions was 0.2%. The proposed method was applied to the determination of nitrite and nitrate in seawater samples. The results for nitrite were nearly in agreement with those obtained by naphthylethylenediamine spectrophotometric analysis (SPA; correlation coefficient 0.9041).

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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

Cited by 25 publications

References 8 publications

Direct determination of bromide ions in seawater by capillary zone electrophoresis using polyethyleneimine-coated capillaries

Direct determination of bromide ions in seawater by capillary zone electrophoresis using polyethyleneimine-coated capillaries

Determination of nitrite and nitrate in a proposed certified reference material for nutrients in seawater by capillary zone electrophoresis with artificial seawater as the background electrolyte using transient isotachophoresis

Optimum conditions for effective use of the terminating ion in transient isotachophoresis for capillary zone electrophoretic determination of nitrite and nitrate in seawater, with artificial seawater as background electrolyte

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