Application of the group substoichiometric separation of gold, mercuric, and cupric diethyldithiocarbamates to determining them by means of activation analysis

Kukula, F.; Šimková, M

doi:10.1007/bf02513668

Cited by 26 publications

(3 citation statements)

References 12 publications

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“…It was confirmed that no evidence of the formation of chloride-mixed metal diethyldithiocarbamate for either copper or zinc was found. Extraction constants for these two ions were reported by several authors and the best values of ACu(ddo2 = 1026 8 and /fzn(DDC)2 = 10159 (9,13, [25][26][27] were used in this work for the evaluation of other extraction constants by Equation 12.…”

Section: Resultsmentioning

confidence: 99%

Determination of extraction constants for metal diethyldithiocarbamates and chloride-mixed metal diethyldithiocarbamates by substoichiometric extraction

Yeh¹,

Lo²,

Shen³

1980

Anal. Chem.

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A new method was developed for simultaneous determination of extraction constants of simple metal dethyldihiocarbamates, M( DDC), and chloride-mixed metal diethyldithiocarbamates, M( DDC),-,CI, by substoichiometric extraction incorporated with radlometry. The extraction constants of simple metal diethyldlthlocarbamates, KM(Dm), for M = Hg( II), Bi( H I ) , Cd(II), As(", and Fe(I1) obtained In this work are in good agreement with those in the literature. The extraction constants of the chloride-mixed metal diethyldithiocarbamates, K~D m ) , _ , c , , for M = Hg(II), BI(III), Cd(II), and As(II1) are reported for the first time.Diethyldithiocarbamate (DDC) is a powerful ligand to chelate many metal ions (1). Extraction constants of various metal diethyldithiocarbamates differ over several decade orders of magnitude (2). The values of the extraction constants are of great importance in predicting the feasibility of separating selectively a single metal or a group of metals by choosing a proper metal diethyldithiocarbamate as extraction reagent (3)(4)(5)(6)(7)(8). So far very little information on the extraction constants has been obtained, although the qualitative extraction order for a variety of metals under specified conditions has been investigated by several authors (6,(9)(10)(11)(12)(13). General schemes for the determination of extraction constants were summarized by Stary and Kratzer (13). Likussar and Boltz used the maximum of the continuous variations plot in terms of normalized absorbance to determine the extraction constants (14, 15). However, these methods are difficult to apply to complexes with relatively high extraction constants as is the case with so many metal diethyldithiocarbamates.In 1968, Ruzicka and Stary introduced the substoichiometric extraction method (16). Since then, the method has been extensively used in analytical work (4,7,9,17,18). The characteristic feature of the method is that the quantity of extractant is adjusted appropriately so as to extract only partial amounts of the metal or metals of interest. The method would become simple and highly selective if a radiotracer technique were incorporated. Wyttenbach and Bajo first applied the substoichiometric extraction method to determine the extraction order of metal diethyldithiocarbamates (9). In their study, successive substoichiometric increments of reagent were used to extract mixtures of two metal elements in 0.1 N H2S04 medium, and then the extraction order was established by comparison of the extraction curves obtained by plotting the extracted fractions vs. amounts of diethyldithiocarbamates added. No quantitative values of extraction constants were obtained in their study.In the present work, a new method was described for quantitative determination of the extraction constants of metal diethyldithiocarbamates by using substoichiometric extraction Present address, Institute of Nuclear Energy Research, Lungtan, Taiwan 325, Republic of China.incorporated with radiometric technique. When the substoichiometric extraction is appli...

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Section: Resultsmentioning

confidence: 99%

Determination of extraction constants for metal diethyldithiocarbamates and chloride-mixed metal diethyldithiocarbamates by substoichiometric extraction

Yeh¹,

Lo²,

Shen³

1980

Anal. Chem.

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“…The mercury(II) back-extraction process can be expressed by the following equation: where DTC denotes dithiocarbamate and subscript org represents organic phase. Thermodynamically, eq 1 should be favored to the right because of the large equilibrium constant According to previous reports, KHg(DTC)2 is in the oder of 1040 which is much greater than the K values of the eight metals included in this study (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25). For example, the extraction constant of Cu is only in the order of 1027, the highest among the eight metals investigated.…”

Section: Resultsmentioning

confidence: 64%

Solvent extraction of dithiocarbamate complexes and back-extraction with mercury(II) for determination of trace metals in seawater by atomic absorption spectrometry

Lo¹,

Yu²,

Hutchison³

et al. 1982

Anal. Chem.

100

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“…In a second review, these authors discussed methods published during the period 1968 to 1970 (2). Since this review, several additional solvent extraction methods have been reported (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). A general discussion of substoichiometric methods for multielemental separation by metal chelate extractions (17), a report on the selectivity of substoichiometric extraction methods (18), and a general review of the substoichiometric approach in analysis have also been published (19).…”

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confidence: 99%

Substoichiometric extraction of cations with mixtures of hexafluoroacetylacetone and tri-n-octylphosphine oxide in cyclohexane

Mitchell¹,

Ganges²

1974

Anal. Chem.

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toxic levels are detectable. The limit of detectability is generally assumed to be three times the standard deviation of the background. Using our results, one can infer the detectability limits as a function of atomic number, and these results are shown in Figure 7. By increasing the bombarding time by a factor of four, the detectability limit will be improved by a factor of two.An important facet of any measuring technique is the Recently the utility of methods of separation in nuclear analyses has been enhanced by the development of sub-

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Application of the group substoichiometric separation of gold, mercuric, and cupric diethyldithiocarbamates to determining them by means of activation analysis

Cited by 26 publications

References 12 publications

Determination of extraction constants for metal diethyldithiocarbamates and chloride-mixed metal diethyldithiocarbamates by substoichiometric extraction

Determination of extraction constants for metal diethyldithiocarbamates and chloride-mixed metal diethyldithiocarbamates by substoichiometric extraction

Solvent extraction of dithiocarbamate complexes and back-extraction with mercury(II) for determination of trace metals in seawater by atomic absorption spectrometry

Substoichiometric extraction of cations with mixtures of hexafluoroacetylacetone and tri-n-octylphosphine oxide in cyclohexane

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