Metal-ion chelation chromatography on silica-immobilized 8-hydroxyquinoline

Jezorek, John R.; Freiser, Henry

doi:10.1021/ac50039a011

Cited by 116 publications

(55 citation statements)

References 15 publications

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“…The sample was then pressure-filtered by nitrogen gas through an acid-cleaned 0.4~pm Nuclepore filter and a silica-immobilized 8-hydroxyquinoline cartridge in an enclosed filtration box equipped with Teflon tubing and fittings. The flow rate was about 10 ml min-'; the 500-900-ml samples passed through the system within 1.5 h. The 8-hydroxyquinoline was immobilized on silica according to the method developed by Hill (1973) as modified by Jezorek and Freiser (1979). About 0.5 g of silica-immobilized 8-hydroxyquinoline was packed into SEP-PAK cartridges from which the original chromatographic substrate had been removed.…”

Section: Methodology For Fe(ii) Measurementmentioning

confidence: 99%

Redox state of iron in the offshore waters of Peru1

Hong¹,

Kester²

1986

Limnology & Oceanography

144

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The total concentration and redox state of iron were examined along a transect across the continental shelf off the Peruvian coast during. January 1984. Total and dissolved iron (0.4~pm filter) were measured by the Co-APDC coprecipitation method. Fe(II) was measured by a preconcentration step with S-hydroxyquinoline bonded to silica as the stationary phase, followed by elution and the ferrozine method.Up to 40 nmol kg-l of Fe(II) was detected in the bottom water at 5-10 km offshore and decreased markedly upward in the water column and with distance offshore. A good correlation between the distribution of Fe(II) and nitrite in the bottom water indicated a common source from the shelf sediments. Elevated Fe(II) concentrations near the sea surface and a diel change were probably due to photochemical reactions involving iron.Total iron levels were >300-500 nmol kg-' in the surface and the bottom water at 5-6 km offshore. About 80-90% of the iron was in the particulate form, indicating a substantial input of iron from continental dust and from the sediments on the shelf. The total iron level decreased considerably within 35 km of the coastline and the iron seemed to be trapped on the shelf.

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Section: Methodology For Fe(ii) Measurementmentioning

confidence: 99%

Redox state of iron in the offshore waters of Peru1

Hong¹,

Kester²

1986

Limnology & Oceanography

144

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“…In this experiment, the net concentration of LIX 84 in the SB-L was 0.719 mmol g À1 . Thus, the maximum copper concentration in the SB-L would be 0.360 mmol g À1 in theory, as in eqn (2). The result, however, shows that the amount of maximum copper adsorption is approximately 0.24 mmol g À1 in the solution of pH 4 as in Fig 2. The value is 67% of the theoretical maximum capacity.…”

Section: Adsorption Equilibria and Capacitymentioning

confidence: 85%

Selective removal of copper ions from aqueous solutions using modified silica beads impregnated with LIX 84

Kim

1999

J. Chem. Technol. Biotechnol.

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Silica beads immobilized with 2-hydroxy-5-nonylacetophenoneoxime (LIX 84) were prepared after silica surface modi®cation by g-aminopropyltriethoxysilane (SB-L). Batch and packed-column tests were conducted to evaluate the metal ion removal capabilities of the prepared adsorbent. Equilibrium isotherms of the SB-L with aqueous solutions containing copper ions were obtained. In addition, the kinetic performances for copper ion removal from aqueous solutions were investigated. The results showed that the amount of extraction increases with solution pH in the range between 1.5 and 5. The selectivity was also experimentally investigated, these results showed that the SB-L adsorbed copper ions selectively in the presence of other metal ions such as Ni 2 , Co 2 , Zn 2 , Cd 2 , Ca 2 and Mg 2 . From the regeneration experiments, it was found that the copper ions adsorbed at the SB-L surface were recovered by acidic solutions. The recovery ratios were between 78% and 90%, depending on the types of acidic solutions. The results showed that the SB-L prepared may be used for the selective extraction of copper ions from aqueous solutions.

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“…This coprecipitated material (ATPB-naphthalene) was tried as column material for the preconcentration of uranium-5-Br-PADAP chelate. The adsorption capacity was found to be 0.65 mg/g by column 'breakthrough' method [28]. The preconcentration factor obtained was 100.…”

Section: Retentionmentioning

confidence: 95%

Ammonium tetraphenylborate-naphthalene adsorbent for the preconcentration and trace determination of uranium in standard alloys and synthetic samples using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by fourth-derivative spectrophotometry

Pancras¹,

Puri²

1999

Mikrochim Acta

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Abstract.A solid ion-pair material produced from ammonium tetraphenylborate (ATPB) and naphthalene has been used for the preconcentration of uranium from the large volume of its aqueous complex samples. Uranium reacts with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) to form a water insoluble, coloured complex. This complex is quantitatively retained on the ATPB-naphthalene adsorbent filled in a column in the pH range 7.0-9.5 and at a flow rate of 2 ml/min. The solid mass from the column is dissolved with 5 ml of dimethylformamide (DMF) and uranium is determined by fourth-derivative spectrophotometry. The calibration curve is linear over the concentration range of 0.13-15.0 gg of uranium in 5 ml of the final DMF solution. Seven replicate determinations of 6 gg of uranium gave a mean peak height (peak-to-peak signal between 592 nm and 582 nm) of 1.02 with a relative standard deviation of 0.95%. The sensitivity is 0.8419 (d4A/dA4)/(~tg m1-1) found from the slope of the calibration curve. The interference of a large number of anions and cations on the estimation of uranium has been studied and the method applied for the determination of uranium in coal fly ash, Zr-base alloy and some synthetic samples corresponding to standard alloys.

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Metal-ion chelation chromatography on silica-immobilized 8-hydroxyquinoline

Cited by 116 publications

References 15 publications

Redox state of iron in the offshore waters of Peru1

Redox state of iron in the offshore waters of Peru1

Selective removal of copper ions from aqueous solutions using modified silica beads impregnated with LIX 84

Ammonium tetraphenylborate-naphthalene adsorbent for the preconcentration and trace determination of uranium in standard alloys and synthetic samples using 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by fourth-derivative spectrophotometry

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