Extraction–thermal lens quantification of cobalt with Nitroso-R-Salt in two-phase aqueous systems with water-soluble polymer polyethylene glycol

Tsar’kov, D. S.; Ryndina, E. S.; Проскурнин, М. А.; Shkinev, V. M.

doi:10.1134/s106193481102016x

Cited by 11 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One may expect that HHILs are suitable for unusual analytical separations involving extraction of hydrophilic reagents and their metal complexes from aqueous solutions, as it was observed for ABSs. 19,21,24,25 As shown below, HHILs are indeed able to extract various representative water-soluble complexing reagents and their metal ion complexes.…”

Section: Properties Of the Hhilsmentioning

confidence: 91%

“…The proposed method has LODs near or lower than in other methods. 20,21,24,25,45,46 The only exception is the very low LOD reported in ref. 47 where a sophisticated mathematical procedure was employed.…”

Section: Extraction and Spectrophotometric Determination Of Co(ii) Wi...mentioning

confidence: 94%

“…They employ hydrophilic ILs which are normally miscible with water but do form a separate layer in the presence of specially introduced salting-out agents, inorganic salts. ABSs were used in extraction for a long time, initially for organic/biomolecule separations 17,18 and then for metal ion extraction and analysis (pioneering work; 19 some subsequent examples [20][21][22][23][24][25] ). However, these previous applications employed water-soluble polymers like polyethyleneglycol (PEG); usage of ionic liquids instead of polymers is a relatively recent invention (pioneering work, 26 review; 27 some applications 28,29 ).…”

Section: Introductionmentioning

confidence: 99%

“…In general, the "IL-rich" (or "polymer-rich") phase in an ABS contains a high amount of water thus presenting a comfortable environment for organic polar compounds and metal ions/hydrated ions/ complexes. 19,21,25 Note that the addition of salting-out agents is a prerequisite for phase separation in ABSs.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

2015

View full text Add to dashboard Cite

show abstract

Section: Properties Of the Hhilsmentioning

confidence: 91%

Section: Extraction and Spectrophotometric Determination Of Co(ii) Wi...mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

2015

View full text Add to dashboard Cite

show abstract

“…To increase sensi tivity, analysts use preconcentration, namely, copre cipitation [5] or extraction in the presence of quaternary ammonium bases [6,7]. Two phase aque ous extraction systems based on polyethylene glycols were proposed in [8] for the thermal lens determina tion of cobalt.…”

mentioning

confidence: 99%

Using silica modified by poly(hexamethylene guanidine) and nitroso-R-salt for the preconcentration and determination of cobalt

et al. 2015

View full text Add to dashboard Cite

Nitrosonaphthols have long been known as organic reagents in inorganic analysis. They have found the widest application to the photometric determination of cobalt [1]. In the complex formation of cobalt(II) with 1 nitroso 2 naphthol and its isomer, 2 nitroso 1 naphthol, cobalt(II) is oxidized to cobalt(III) [2]. The neutral CoL 3 compounds formed are extracted with nonpolar solvents [1,3] or with hydrophobic adsorbents, for example, with С 16 silica [4]; the last named adsorbents are used for the preconcentration and separation of cobalt from other metals followed by its photometric determination. The introduction of sulfo groups into 1 nitroso 2 naphthol with the for mation of 1 nitroso 2 naphthol 3,6 disulfonic acid, nitroso R salt (NRS), offers a number of advantages, i.e., reduces the рК а of the hydroxyl group in compar ison to that of the not sulfonated analogue and enhances the solubility of the reagent and its com plexes in water.Procedures for the photometric determination of cobalt as its complex with nitroso R salt are suffi ciently specific but not very sensitive, like the proce dures using 1 nitroso 2 naphthol. To increase sensi tivity, analysts use preconcentration, namely, copre cipitation [5] or extraction in the presence of quaternary ammonium bases [6,7]. Two phase aque ous extraction systems based on polyethylene glycols were proposed in [8] for the thermal lens determina tion of cobalt.Adsorption preconcentration allows analysts to extract an analyte with a rather small portion of an adsorbent, to exclude the use of organic solvents, and is easy to perform. Adsorbents of different nature are widely used for the adsorption preconcentration and subsequent photometric determination of cobalt [9][10][11][12][13][14][15]. In determining cobalt in natural and process waters, it was extracted with a KB 4P 2 cation exchanger, treated with an NRS solution, and cobalt was determined by the color of its complex [9]. A QAE Sephadex A 25 anion exchanger [10] and silica chemically modified with triphenylphosphonium groups [11] were used for the adsorption preconcen tration of a cobalt(III) complex with NRS and its sub sequent photometric determination. Adsorbents selective to cobalt were obtained by the immobiliza tion of NRS on an Amberlite CG 400 [12] anion exchanger and gels based on chitosan [13] and gelatin [14,15]. To attach NRS to a silica surface, we pro posed the preliminary modification of silica with poly(hexamethylene guanidine) (PHMG) [16]. The adsorbent synthesis is simple and requires available reagents, which opens up a possibility of its wide appli cation.In this work we consider the use of silicas consecu tively modified with poly(hexamethylene guanidine) Abstract-An adsorbent based on silica consecutively modified with poly(hexamethylene guanidine) and nitroso R salt is proposed for the adsorption preconcentration and photometric determination of cobalt. The approach gives adsorbents with the controlled surface concentration of the reagent. The adsorbent extracts cobalt(II) from solutions...

show abstract

Analytical Measurement and Data Processing Considerations

2019

Photothermal Spectroscopy Methods

View full text Add to dashboard Cite

Extraction–thermal lens quantification of cobalt with Nitroso-R-Salt in two-phase aqueous systems with water-soluble polymer polyethylene glycol

Cited by 11 publications

References 11 publications

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

Using silica modified by poly(hexamethylene guanidine) and nitroso-R-salt for the preconcentration and determination of cobalt

Analytical Measurement and Data Processing Considerations

Contact Info

Product

Resources

About