Ion chromatographic determination of traces of some oxoanions with direct spectrophotometric detection

Fung, YS; Dao, K.L.

doi:10.1016/0003-2670(94)00364-r

Cited by 14 publications

(4 citation statements)

References 33 publications

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“…Once inside the pores, anions would be expected to encounter a higher concentration of unreacted primary amine groups with 6-nm PolyCAT A than with 30-nm material, as mentioned above. The small differences in ion-exchange affinity for halogenide anions and relatively high affinity for nitrate and oxoanions observed earlier for aminopropylsilica [14][15][16][17][18] might be an additional explanation of the selectivity observed here. Neither of these structural differences between the 6-and 30-nm materials would be expected to affect selectivity for alkali and alkaline-earth metal cations, and indeed the elution order is the same for both.…”

Section: Resultssupporting

confidence: 57%

Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures

Kebets

Nesterenko

et al. 2004

Microchimica Acta

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Section: Resultssupporting

confidence: 57%

Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures

Kebets

Nesterenko

et al. 2004

Microchimica Acta

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“…Ion chromatography is the traditional method for the separation and quantitation of trace metals in different forms [8,9]. The recent advance in capillary electrophoresis (CE) provides a more promising separation method due to its simple instrumentation, fast analysis, high separation efficiency, good sensitivity, and selectivity [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Determination of trace metals by capillary electrophoresis

Fung

Lau

2001

Electrophoresis

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A new analytical procedure is developed using a strong complexing agent, 1,10-phenanthroline (Phen), for direct UV detection of Zn, Mn, Cu, Co, Cd, and Fe at microg/L concentrations in environmental water samples. The metal chelates formed showed different electrophoretic mobilities and solved the comigration problem for capillary electrophoresis (CE) separation of free metal ions. To obtain stable metal-Phen chelates during the capillary zone electrophoresis (CZE) run, both pre-column and on-column complexation are required and threefold excess of Phen over metal ions should be added to the sample. The optimized background electrolyte (BGE) consists of 30 mM hydroxylamine hydrochloride and 0.1% methanol at pH 3.6. Under hydrodynamic sampling, CE run at + 20 kV in 65 cm x 0.05 mm ID fused-silica column with detection at 265 nm, baseline separation, satisfactory working ranges (10 microg/L to 5.5 mg/L), sensitive detection limits (1-3 microg/L), good repeatability for migration times (relative standard deviation, RSD 0.36-0.81%, n = 5), peak area (RSD 3.2-4.2%, n = 5) and peak height (RSD 3.2-4.5%, n = 5) were obtained for the metal cations investigated. The reliability of the method was established by parallel determination using the inductively coupled plasma-atomic emission spectrometry (ICP-AES) method giving results within statistical variation. The procedure developed is shown to provide a quick, sensitive, precise, and economic method for simultaneous determination of metal cations that can form stable chelates with Phen.

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“…The determination and speciation of oxoanions in environmental water bodies has been performed using ionexchange chromatography and ion-pair chromatography [5], as well as suppressed and nonsuppressed ion chromatography (IC) [17,18]. However, the use of a dedicated chromatographic system, the long analysis time and matrix interference are problems facing the liquid chromatographic (LC) methods.…”

Section: Introductionmentioning

confidence: 99%

Determination of oxoanions in river water by capillary electrophoresis

Fung

Lau

2001

Electrophoresis

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A new capillary electrophoresis (CE) procedure was developed for simultaneous determination of ten oxoanions (CrO4(2-), SeO4(2-), MoO4(2-), WO4(2-), VO4(3-), SeO3(2-), As04(3-), TeO3(2-), TeO4(2-), and AsO3(3-)) which were baseline-separated from each other and from the interfering UV absorbing anions (NO3- and NO2-) commonly found in environmental water samples. The new background electrolyte system developed contained 5 mM potassium phosphate and 0.007 mM octadecyltrimethylammonium hydroxide, pH 11.2. The optimized working conditions were electrokinetic sampling at -5 kV for 10 s, running voltage at -15 kV with 5 microA current, and detection wavelength at 205 nm. No interference was observed for non-UV-absorbing anions and UV-absorbing anions up to 20 and 10 times higher concentrations respectively. The speed of analysis was fast, with a complete CE run within 6 min. Wide linear ranges (1-2,000 microg/L), good repeatability in migration time (relative standard deviation RSD 0.55-2.8%), satisfactory precision in peak area (RSD 3.8-5.6%) and peak height (RSD 3.9-5.3%) measurement, and detection limits (1-25 microg/L) sufficiently sensitive to detect oxoanions found in environmental water samples were obtained. The reliability of the CE procedure developed had been established by recovery test and parallel method determination using atomic absoprtion spectrophotometry for real river water sample.

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Ion chromatographic determination of traces of some oxoanions with direct spectrophotometric detection

Cited by 14 publications

References 33 publications

Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures

Ion-Chromatography Performance of Poly(Aspartic) Acid Bonded Silica with Various Pore Sizes at Different Ionic Strengths and Column Temperatures

Determination of trace metals by capillary electrophoresis

Determination of oxoanions in river water by capillary electrophoresis

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