Trace enrichment and ion chromatographie determination of metal oxoanions in environmental water samples

Fung, YS; Dao, K.L.

doi:10.1016/0003-2670(95)00057-7

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…Mercury may be enriched by forming alloys with gold coil. For preparative scale extractions, cation exchangers or chelating resins based on iminodiacetic acid (Chelex 100), − polyamines (Chelamin), , crown ethers, − inorganic surfaces (CeO 2 ), mercaptothiazoles, hydroxyquinolines, and dithiocarbamates are employed. Unfortunately, all these ligands suffer from insufficient selectivity and/or capacity, which significantly reduces or impedes their broad applicability.…”

Section: Introductionmentioning

confidence: 99%

Dipyridyl Amide-Functionalized Polymers Prepared by Ring-Opening-Metathesis Polymerization (ROMP) for the Selective Extraction of Mercury and Palladium

et al. 1998

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Ring-opening-metathesis polymerization (ROMP) was used for the preparation of a dipyridylcarbamide-functionalized polymer suitable for solid-phase extraction of metal ions from aqueous solutions. Resins were prepared by the copolymerization of the functional monomer N,N-di-2-pyridyl-endo-norborn-2-ene-5-carboxamide (I) with 1,4,4a,5,8,8a-hexahydro-1,4,5,8-exo-endo-dimethanonaphthalene (II), using the well-defined Schrock catalyst Mo(N-2,6-i-Pr2C6H3)CHCMe2Ph(OCMe(CF3)2)2 (III). The polymerization proceeds in a living manner, allowing the stoichiometric buildup of polymers. NMR investigations proved the expected backbone structure of the resulting polymers, where the binding site of the monomer remains unaffected in course of the polymerization. The new materials were investigated in terms of their complexation behavior versus a large variety of mono-, di-, tri-, and tetravalent metal ions employing UV−vis spectroscopy as well as AAS and ICP−OES techniques. The polymer-bound dipyridylamide ligand showed excellent selectivity toward Hg2+ and Pd2+, allowing the selective extraction of both divalent metal ions over a broad range of concentrations from complex mixtures. Due to the stability of the resulting complexes, high loadings of the material with both metals were achieved. To elucidate the chemistry of complexation, X-ray structures of compound (I) as well as ESI-MS investigations of the complex of I with Pd2+ were performed. I crystallized in the monoclinic space group P21/c, and forms 1:1 complexes with Pd2+ under conditions identical to the SPE experiments.

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Section: Introductionmentioning

confidence: 99%

Dipyridyl Amide-Functionalized Polymers Prepared by Ring-Opening-Metathesis Polymerization (ROMP) for the Selective Extraction of Mercury and Palladium

et al. 1998

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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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Trace enrichment and ion chromatographie determination of metal oxoanions in environmental water samples

Cited by 11 publications

References 13 publications

Dipyridyl Amide-Functionalized Polymers Prepared by Ring-Opening-Metathesis Polymerization (ROMP) for the Selective Extraction of Mercury and Palladium

Dipyridyl Amide-Functionalized Polymers Prepared by Ring-Opening-Metathesis Polymerization (ROMP) for the Selective Extraction of Mercury and Palladium

Determination of trace metals by capillary electrophoresis

Determination of oxoanions in river water by capillary electrophoresis

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