Uses of liquid ion-exchangers in inorganic analysis☆

Green, H.

doi:10.1016/0039-9140(73)80262-0

Cited by 59 publications

(3 citation statements)

References 76 publications

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“…On the other hand, the behavior of the TLM signal after it reached the peak may correspond to back-migration of the product to the interface. The micelle formation of metal complexes and a quaternary ammonium salt such as trioctylmethylammonium chloride at an interface is a well-known example . Therefore, the ion-pair product extracted may form reversed micelles in chloroform.…”

Section: Resultsmentioning

confidence: 99%

Integration of a Microextraction System on a Glass Chip: Ion-Pair Solvent Extraction of Fe(II) with 4,7-Diphenyl-1,10-phenanthrolinedisulfonic Acid and Tri-n-octylmethylammonium Chloride

2000

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An ion-pair solvent extraction was performed in a microchannel fabricated in a quartz glass chip. the aqueous solution of Fe-bathophenanthrolinedisulfonic acid complex and the chloroform solution of tri-n-octylmethylammonium chloride were introduced into the microchannel, and a parallel two-phase laminar flow was formed. The ion-pair product extracted in chloroform was monitored by the thermal lens microscope. The ion-pair product was gradually extracted from aqueous solution into chloroform when the flow was very slow or stopped, while nothing was extracted into chloroform when the flow was fast. The time for extraction in the present 250 microns microchannel, 45 s, roughly coincided with the molecular diffusion time, and the extraction time was at least 1 order shorter compared with the ordinary extraction time using a separatory funnel and mechanical shaking. The microspace in the microchannel was characterized by the large specific interface area and short diffusion distance, and these characteristics may contribute to highly efficient extraction without mechanical shaking. The success of this molecular transport may lead to the integration of more complicated separation and chemical operations on a microchip and more applications.

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Section: Resultsmentioning

confidence: 99%

Integration of a Microextraction System on a Glass Chip: Ion-Pair Solvent Extraction of Fe(II) with 4,7-Diphenyl-1,10-phenanthrolinedisulfonic Acid and Tri-n-octylmethylammonium Chloride

2000

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“…The uses of liquid ion exchangers in inorganic analysis have been reviewed by Green (77) and includes more than 100 references to material published since his prior review in 1964. Applications of liquid ion exchangers include their use in the determination of trace elements in soils and 5 standard rocks (157).…”

Section: Techniquesmentioning

confidence: 99%

Inorganic and geological materials

Dinnin¹

1975

Anal. Chem.

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“…It is well known that a wide variety of anionic metal complexes are extracted to organic solutions by cationic liquid ion-exchangers, such as high molecular amines and quaternary ammonium salts, through the formation of an ion-pair association complex in the organic solutions (Q' * MX;; M"' , metal ion; X-, anionic ligand) (6). It is also known that the extractability of such metal complexes differs significantly from one valence state of the metal to another.…”

Section: Introductionmentioning

confidence: 99%

Transport of Iron and Cobalt Complex Ions through Liquid Membrane Mediated by Methyltrioctylammonium Ion with the Aid of Redox Reaction

Ohki

Hinoshita

Takagi

et al. 1983

Separation Science and Technology

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A new type of carrier-mediated metal transport through liquid membrane is presented. The system involves redox reactions rather than acid-base reactions which have often been utilized in metal transport systems, Iron ion was selectively transported and concentrated through the membrane via a chloride complex by use of a lipophilic quaternary ammonium ion, rnethyltrioctylammonium (MTOA. Q'). as a carrier. The two aqueous solutions of different redox potentials were separated by a polymer-supported liquid membrane in which MTOA .chloride (Q+ .CI-) was dissolved as the carrier. Iron(l1l) ion in hydrochloric acid media formed a FeCIT type complex which was readily extracted to the organic membrane phase as an ion-pair complex Q + . F e C k . On contact with a reducing agent on the other side of the membrane. iron(1ll) was reduced to iron(I1) and liberated into aqueous solution; the chloride complexes of iron( 11) are too hydrophilic to stay in the membrane phase. On the other hand. cobalt ion was transported via nitrilotriacetic acid (NTA) complex by MTOA carrier in a similar manner to the iron transport. The nature of the transport reactions was studied under various operational conditions (redox agents, carrier and ligand concentration, pH, coexisting metals, etc.). The extension of these transport reactions to a water-in-oil-in-water type emulsion system as well as to a photcassisted transport system was studied.

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Uses of liquid ion-exchangers in inorganic analysis☆

Cited by 59 publications

References 76 publications

Integration of a Microextraction System on a Glass Chip: Ion-Pair Solvent Extraction of Fe(II) with 4,7-Diphenyl-1,10-phenanthrolinedisulfonic Acid and Tri-n-octylmethylammonium Chloride

Integration of a Microextraction System on a Glass Chip: Ion-Pair Solvent Extraction of Fe(II) with 4,7-Diphenyl-1,10-phenanthrolinedisulfonic Acid and Tri-n-octylmethylammonium Chloride

Inorganic and geological materials

Transport of Iron and Cobalt Complex Ions through Liquid Membrane Mediated by Methyltrioctylammonium Ion with the Aid of Redox Reaction

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