Nonferrous metallurgy.  II.  Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

Bachman, Robert Z.; Banks, Charles V.

doi:10.1021/ac60274a011

Cited by 10 publications

(8 citation statements)

References 631 publications

(410 reference statements)

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“…The effect of ionic strength on the distribution where µ is the ionic strength may be derived from the data of Figure 5. Equation 6is similar to the equation derived by Sides and Kenner (7) for the effect of ionic strength on the distribution coefficients of the alkaline earth metals. The various parameters for the equations representing the data are given in Table III and the experimental and calculated values for log Fmax are shown in Table IV.…”

Section: Resultsmentioning

confidence: 70%

“…Chem., 38, 707 (1966). and Kenner (7) confirmed this result but found that the distribution coefficients for these ions again increased in the region of pH 7 and above. They also showed that an increase in ionic strength caused a decrease in the coefficients.…”

mentioning

confidence: 73%

“…The decrease in the value of log Kmax with increase in ionic strength shown in Figure 5, together with the fact that the maxima and minima of the curves in Figure 2 are shifted to lower pH values as the ionic strength increases, further substantiates the decreased effect of ion exchange and the increased effect of chelation as the pH is increased. The imbibition of neutral sodium chloride ion pairs caused by the increase in ionic strength (7) increases the sodium ion concentration inside the resin. The sodium ions which entered by imbibition compete with hydrogen ions and alkaline earth ions for the ionic sites, and chelation becomes effective at a lower pH since there is increased ionization due to the effect of the sodium ions.…”

Section: Resultsmentioning

confidence: 99%

“…The iminodiacetate ion exchange resin Dowex A-l (Chelex 100) has been used for the separation of various metal ions from high ionic strength solutions (7-4) and for the concentration of trace constituents (5). Leyden and Underwood (6) and Sides and Kenner (7) studied the effects of pH, ionic strength, and temperature upon the distribution coefficients of alkaline earths and transition metal ions using a batch process. Leyden and Underwood (6) noted that the distribution coefficients for alkaline earth ions were not affected greatly by temperature and that the coefficients increased with pH up to pH 4 or 5 at which the distribution coefficients became essentially constant at constant ionic strength.…”

mentioning

confidence: 99%

“…They also showed that an increase in ionic strength caused a decrease in the coefficients. With transition metal ions, the distribution coefficients increase rapidly to a maximum in the range of pH 4 to 5 and are not further affected by rise in pH or ionic strength (6,7).…”

mentioning

confidence: 99%

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Effect of pH and ionic strength on ion exchange and chelating properties of an iminodiacetate ion exchange resin with alkaline earth ions

Luttrell¹,

More²,

Kenner³

1971

Anal. Chem.

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useful if the user wishes to have the unknown compared to specific library compounds.(3) A histogram is also presented for each unknown of the number of library compounds which yielded a given value of the disagreement criterion. These compounds satisfy any prefiltering conditions and have been calculated over the requisite mass range. (Compounds which have been rejected because the disagreement criterion exceeded the 10th best member are not included in the histogram.) This feature is particularly useful in determining the distribution of the disagreement criterion beyond the top ten list.

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Section: Resultsmentioning

confidence: 70%

mentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Effect of pH and ionic strength on ion exchange and chelating properties of an iminodiacetate ion exchange resin with alkaline earth ions

Luttrell¹,

More²,

Kenner³

1971

Anal. Chem.

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A Spectrophotometric Study OE Zirconium Complexes of 4,5‐Dihydroxyfluorescein

Sun¹,

Liu²

1972

J Chinese Chemical Soc

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Zirconium (IV) ions form violet red complex with 4,5‐dihydroxyfluorescein in fairly strong mineral acid medium. The reagent has been successfully applied as a metal indicator in the direct EDTA titration of zirconium. The complex formed by 4,5‐dihydroxyfluorescein and zirconium ions has been studied spectrophotometrically in 0.1M HCl solution. It is found that when an excess of metal ion is present, a violet red colored complex with metal‐ligand ratio of 1:1, (MR) is formed and when an excess of 4,5‐dihydroxyfluorescein is present a 1:2 complex (MR2) may be predominant. The 1:1 complex has maximum absorption at 510 mμ and the 1:2 complex has very low solubility and tends to precipitate out from the solution. Job's method, log‐ratio method and gravimetric method were used to establish the composition of complexes. The apparent stability constant of the 1:1 complex is found to be log Kh = 4.46 or Kh = 2.9×101 at pH 1.2.

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Studies with inorganic ion exchange membranes—a membrane selective to strontium ion

et al. 1977

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Strontium tungstoarsenate membrane shows response for Sr2+ and can be used to determine the activity of these ions. The response time of the membrane is a few seconds and the potentials generated are reproducible. The membrane electrode can be used for one year without any drift in potentials. The membrane was found to be more selective to Sr2+ ions than to many other of univalent, bivalent and tervalent cations. Anions also show no interference.

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Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

Cited by 10 publications

References 631 publications

Effect of pH and ionic strength on ion exchange and chelating properties of an iminodiacetate ion exchange resin with alkaline earth ions

Effect of pH and ionic strength on ion exchange and chelating properties of an iminodiacetate ion exchange resin with alkaline earth ions

A Spectrophotometric Study OE Zirconium Complexes of 4,5‐Dihydroxyfluorescein

Studies with inorganic ion exchange membranes—a membrane selective to strontium ion

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