Preconcentration of Heavy Metal Ions Using Synergistic Extraction with Dithizone and Tributylphosphine Oxide on the Basis of HSAB Rule

Kawamoto, Hiroshi; Yamazaki, Satoshi; Katoh, Eiji; Tsunoda, Kin-ichi; Akaiwa, Hideo

doi:10.2116/analsci.8.265

Cited by 4 publications

(3 citation statements)

References 2 publications

(1 reference statement)

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“…From Fig (2) it was observed that 1:2 ratio was given best recovery of the percentage 83.1% for Cd 2+, 100% for Cu 2+ , 100% for Mn 2+ , 99.755 for Pb 2+ and 96.25% for Zn 2+ . These results agree with the findings of (Cheng et al, 2017;Kawamoto et al, 1992) whose illustrated that M 2+ ions preconcentration with dithizone (Dz) achieved according to the equation:…”

Section: Effect Of Metal: Ligand Ratiosupporting

confidence: 93%

Determination of Cd2+, Cu2+, Mn2+, Pb2+, and Zn2+ in Aqueous Solution after Their Separation and Preconcentation as Metal - Dithizone Complexes on Activated Carbon

Maghazy

Moalla

Rashed

et al. 2020

Aswan University Journal of Environmental Studies

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Section: Effect Of Metal: Ligand Ratiosupporting

confidence: 93%

Determination of Cd2+, Cu2+, Mn2+, Pb2+, and Zn2+ in Aqueous Solution after Their Separation and Preconcentation as Metal - Dithizone Complexes on Activated Carbon

Maghazy

Moalla

Rashed

et al. 2020

Aswan University Journal of Environmental Studies

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“…There are other reports of synergistic effects of two different ligands in metal ion extraction processes. − In one of these reports, it is shown that the two ligands form a host−guest assembly that enhances metal ion binding and extraction …”

Section: Resultsmentioning

confidence: 99%

“…Such metal ion separations have important applications in the removal of toxic metal ions from the environment and in the remediation of radioactive wastes containing metal ions. , Yet, it remains a challenge to design ligands that are specific for the extraction of a particular metal ion. Important factors such as metal ion complex solubility and synergistic ligand−ligand interactions − are not easily predicted and incorporated into ligand design. Thus, combinatorial methods that allow ready variation of ligands and their substituents may be a useful in improving metal ion extraction processes.…”

Section: Introductionmentioning

confidence: 99%

Chloroform-Soluble Schiff-Base Zn(II) or Cd(II) Complexes from a Dynamic Combinatorial Library

et al. 2001

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A dynamic combinatorial library of metal ion Schiff-base complexes have been studied for the extraction of Zn(II) or Cd(II) from aqueous solution into chloroform. Library components consist of different aminophenols and 2-pyridinecarboxaldehyde. Extraction of both Zn(II) and Cd(II) into chloroform was observed from aqueous solutions containing 0.0500 mM M(NO3)2, 0.100 M aminophenol, 0.100 M 2-pyridinecarboxaldehyde, 0.100 M NaCl, and 5.00 mM buffer at pH 8.5. Extraction was dependent on pH but not on counterions including Cl-, Br-, or NO3-. Studies showed that equilibrium was attained between the Schiff-base complexes across the two-phase chloroform-water system after 24 h of stirring. Analysis of the extracted species by use of 1H NMR spectroscopy and mass spectrometry as well as solubility studies on characterized complexes suggested that the major extracted species is the neutral bis-Schiff-base metal ion complex. In libraries containing mixtures of two different aminophenols and 2-pyridinecarboxaldehyde, an enhanced extent of extraction of Zn(II) into chloroform is observed. Studies suggest that a Zn(II) complex, which is likely the mixed Schiff-base complex, has superior extraction properties compared to simple libraries with a single aminophenol component. The structures of two bis-Schiff-base complexes of Zn(II) and one of Cd(II) have been determined by X-ray crystallography. The geometries of the two Zn(II) complexes, which differ only by a methyl substituent on the Schiff-base ligand, are markedly different, supporting the use of combinatorial methods in coordination chemistry. Zn(SB14)2 crystallized as the sesquihydrate (C24H18N4O2Zn.1.5 H2O) in the space group C2/c, with cell dimensions a = 23.219(15) A, b = 11.299(7) A, c = 16.822(11) A, beta = 102.91(5) degrees, V = 4302(5) A3, and Z = 8. Zn(SB15)2 crystallized as a 1:1 methanol solvate (C26H22N4O2Zn.CH3OH) in the space group P2(1)/c with cell dimensions a = 13.981(5) A, b = 7.978(3) A, c = 22.568(8) A, beta = 104.53(3) degrees, V = 2436.8(15) A3, and Z = 4. Cd(SB14)2 crystallized as a 1:1 ethanol solvate (C24H18N4O2Cd.CH3CH2OH) in the space group R3 with unit cell dimensions of a = 36.423(2) A, c = 9.2930(10) A, V = 10678(2) A3, and Z = 18.

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Selective Extraction with Chelates, Macrocycles and Calixarenes

Roundhill

2001

Extraction of Metals From Soils and Waters

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Preconcentration of Heavy Metal Ions Using Synergistic Extraction with Dithizone and Tributylphosphine Oxide on the Basis of HSAB Rule

Cited by 4 publications

References 2 publications

Determination of Cd2+, Cu2+, Mn2+, Pb2+, and Zn2+ in Aqueous Solution after Their Separation and Preconcentation as Metal - Dithizone Complexes on Activated Carbon

Determination of Cd2+, Cu2+, Mn2+, Pb2+, and Zn2+ in Aqueous Solution after Their Separation and Preconcentation as Metal - Dithizone Complexes on Activated Carbon

Chloroform-Soluble Schiff-Base Zn(II) or Cd(II) Complexes from a Dynamic Combinatorial Library

Selective Extraction with Chelates, Macrocycles and Calixarenes

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