Simultaneous kinetic determination of zinc, magnesium, copper and nickel by a ligand substitution reaction

Mentasti, Edoar̈do; Dlask, Vladimír; Coe, J. S.

doi:10.1039/an9851001451

Cited by 7 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Differences in the rate of ligand substitution of the Zn(II), Mg(II), Cu(II), and Ni(II) complexes with 3-hydroxy-4-(2hydroxy-5-methylphenylazo)naphthalene-l-sulfonic acid (camalgite) and EDTA have been used by Mentasti et al (220) for simultaneous determinations in binary and ternary mixtures at the KT8 M level. Stopped-flow mixing and photometric monitoring at 500 nm were used, and a logarithmic extrapolation approach was adapted for data treatment.…”

Section: Differential Rate Methodsmentioning

confidence: 99%

Kinetic determinations and some kinetic aspects of analytical chemistry

Mottola¹,

Pérez‐Bendito²,

Mark³

1988

Anal. Chem.

View full text Add to dashboard Cite

Section: Differential Rate Methodsmentioning

confidence: 99%

Kinetic determinations and some kinetic aspects of analytical chemistry

Mottola¹,

Pérez‐Bendito²,

Mark³

1988

Anal. Chem.

View full text Add to dashboard Cite

“…For the species of interest to be resolved, a distinct difference in reaction rate is required. In addition, special equipment is required for fast reaction rate measurement [14][15][16][17] and the molar absorptivities of most metal complexes involved in those determination are not large enough to permit the determination of sub-ppm of metal species. Batchwise metal complex formation is most often involved or needed off-line, prior to the analytical measurement, in the case of ligand substitution.…”

mentioning

confidence: 99%

Simultaneous differential kinetic determination of cobalt and nickel based on on-line complex formation and ligand substitution reaction using a stopped-flow FIA system

Yamane

Ishimizu

1991

Mikrochim Acta

View full text Add to dashboard Cite

A differential kinetic method utilizing a stopped-flow FIA system is proposed for the simultaneous determination of cobalt and nickel at sub-ppm levels in mixtures. The method is based on the large difference in the rates of the ligand substitution reaction of the metal complexes of 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)aniline (PSAA) with nitrilotriacetic acid. The apparent reaction rate for the Ni-PSAA complex is more than 100 times larger than that for Co-PSAA complex. The relative standard deviations in the analysis of binary mixture of 0.50 #g/ml cobalt and 0.30 #g/ml nickel were 1o9% and 2.1%, respectively (n = 7). The sample throughput is about 20 h -1. The effect of various ions was also studied. The proposed method has satisfactorily been applied to synthetic samples containing different ratios of cobalt and nickel 1/12 to 10/1. Some heterocyclic azo compounds have been developed as highly sensitive spectrophotometric reagents of metals over the past 20 years [-1-6-]. Recently, some efforts to develop water-soluble compounds of the same type [-7-11] have been made since water solubility offer an improvement in simplicity, rapidity, and accuracy in the determination by eliminating the need of solvent extraction or avoiding the use of a surfactant or a water miscible organic solvent. This water-soluble property is also of interest for application in flow-injection analysis (FIA). 2-(5-Bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)aniline (PSAA) [-11] is one of the chromogenic synthesized reagents which form water-soluble complexes with Co(II), Ni(II), Fe(II), and Cu(II) having molar absorptivities of 105 or close to this level. These metal complexes, however, show highly overlapped absorption spectra in the

show abstract

Simultaneous determination of cobalt(III)-copper(II) and cobalt(III)-nickel(II) mixtures by differential kinetic methods

Arias

Jiménez

1989

Mikrochim Acta

View full text Add to dashboard Cite

Simultaneous kinetic determination of zinc, magnesium, copper and nickel by a ligand substitution reaction

Cited by 7 publications

References 1 publication

Kinetic determinations and some kinetic aspects of analytical chemistry

Kinetic determinations and some kinetic aspects of analytical chemistry

Simultaneous differential kinetic determination of cobalt and nickel based on on-line complex formation and ligand substitution reaction using a stopped-flow FIA system

Simultaneous determination of cobalt(III)-copper(II) and cobalt(III)-nickel(II) mixtures by differential kinetic methods

Contact Info

Product

Resources

About