Comparison of anion removal capacities of Octolig® and Cuprilig

Martin, Dean F.; Franz, Douglas M.

doi:10.1080/10934529.2011.623634

Cited by 6 publications

(4 citation statements)

References 15 publications

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Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 96%

“…Results of the study with Octolig®, summarized in Table 7 indicate that there was no statistically significant difference [59] between the two methods. Similar results were obtained for a capacity for arsenate [59]. The results (Table 7) were also used to see if there was a major difference between different preparations of Octolig® by comparing capacity for phosphate (Sample 1 vs.…”

Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 96%

“…Table 7). A standard batch method is presented here for the sake of comparison [59]. A sample of Octolig ® (5 g as received) was placed in a 250-mL Erlenmeyer flask covered with 100 mL of about 1600 ppm phosphate as NaH 2 PO 4 .…”

Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 99%

“…Selected removal capacities (moles/kg) calculated for phosphate comparing the chromatography method versus a batch method (= 3)[59] …”

mentioning

confidence: 99%

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Chromatographic Separations with Selected Supported Chelating Agents

Martin¹

2013

Column Chromatography

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Chelex is another example of a commercially available supported chelating agent. The material was available from "io-Rad and was used to purify compounds, most notably transition metal ions. [ ] The preference for transition metal ions, e.g., copper II or iron II ions, over such univalent metal ions as sodium or potassium is said to be about to [ ]. The material consists of a styrene-divinylbenzene copolymer to which is attached iminodiacetic acid moieties.In addition, Chelex can be used for purification of DN" [ ]. Though the mechanism of action seems uncertain, a plausible suggestion is that Chelex protects DN" from the effect of heating that is used to release DN" from cells. In addition, Chelex can sequester magnesium and heavy metal ions that would adversely affect the DN". "fter treatment, DN" and RN" remain in the aqueous supernatant above the Chelex sample.Supported chelating agents serve three major functions, i.e., concentration, elimination, and recycling metal ions. Concentration of metal ions is a significant function that enhances analytical capabilities.Measuring the concentration of trace metals in dilute sea water is a significant analytical challenge. Using supported chelators allows an analyst to concentrate transition metals present in trace amounts from a large volume of sea water onto a solid in, say, a chromatography column, then eluting with dilute nitric acid to obtain a suitably concentrated solution. The technique can also be used to eliminate matrix effects. Unfortunately, Chelex seems to be less effective in sea water than in fresh water [ ]."lso, users of Chelex may encounter problems with certain natural waters that are colored with samples of naturally occurring chelating agents such as soil organic acids e.g., fulvic or humic acids that provide competition for metal ions and reduce the effectiveness of Chelex [ , ]. Ryan and Weber [ ] studied this problem and made pre-concentration comparisons of trace levels of copper ion in standard solutions comparing Chelexwith three different chelating agents supported on silica. The reagents tested were N-propylethylenediamine, the bis-dithiobicarbonate of that compound, and -hydroxyquinoline. The results indicated that in the presence of organic compounds typical organic-rich natural waters reduced the effectiveness of Chelexin comparison with the three silica-supported agents. In general, immobilizedquinolinol was the most effective, as prepared by a modified Hill procedure [ ].It is not the purpose of this review to criticize use of a successful commercial supported chelator rather one may note that no such product can be expected to be highly effective under all conditions and circumstances, so it seems appropriate to consider examples of custom-made agents.

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Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 96%

Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 96%

Section: Batch Separations Versus Column Chromatography Using Octolig®mentioning

confidence: 99%

“…Selected removal capacities (moles/kg) calculated for phosphate comparing the chromatography method versus a batch method (= 3)[59] …”

mentioning

confidence: 99%

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Chromatographic Separations with Selected Supported Chelating Agents

Martin¹

2013

Column Chromatography

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Removal of BPA model compounds and related substances by means of column chromatography using Octolig®

Alessio

Martin

2012

Journal of Environmental Science and Health, Part A

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Octolig®, a polyethylenediimine ligand covalently attached to high-surface area silica gel, was used to study the removal of phenolic compounds from aqueous samples by column chromatography. Model phenolic compounds of Bisphenol A (BPA), 4-isopropylphenol and 4-(t-butyl) phenol, were selected for this study due to their similarities in pKa and log P values. The percent removal of these compounds by Octolig® was 26 ± 2 and 22 ± 2, respectively. Furthermore, the three isomers of nitrophenol were investigated as well as additional phenolic compounds, such as amoxicillin and five phenolic dyes. These compounds have a pKa range of 2-10.2. The compounds that have pKa values less than 8.3 were able to be completely removed by Octolig®, yet compounds with pKa values of 8.3 and higher resulted in approximately 20-26% removal.

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Enhanced removal of aqueous BPA model compounds using Metalloligs

Franz

Martin

2013

Journal of Environmental Science and Health, Part A

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A model compound, 4-(t-butyl)phenol, was used as a substitute for BPA (bisphenol acetone or Bisphenol A) a material used for the production of a large volume of common plastics. Unfortunately, BPA is suspected to have estrogenic properties, and there is a suspicion that even small amounts can have a deleterious effect against humans, especially female infants. The model compound has some similarities to BPA, but lacks some of the serious properties of BPA dust. Since other workers have demonstrated the capability of removing BPA from plastics by extraction with saline or alcohol, we studied whether Octolig, a polyethylenediimine supported on silica gel, or transition metal derivatives of Octolig could be used to remove concentrations for model compounds from aqueous solution. Octolig gave modest results 20%, the manganese (II) and iron (III) derivatives gave poor results, Cuprilig was an improvement over those two Metalloligs, but the cobalt(II) derivative was able to remove up to 56% of the model compound. Two methods were studied, batch and column chromatography. Under the conditions used in this study, the batch method was superior.

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Comparison of anion removal capacities of Octolig® and Cuprilig

Cited by 6 publications

References 15 publications

Chromatographic Separations with Selected Supported Chelating Agents

Chromatographic Separations with Selected Supported Chelating Agents

Removal of BPA model compounds and related substances by means of column chromatography using Octolig®

Enhanced removal of aqueous BPA model compounds using Metalloligs

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