Tetraphenylarsonium chloride as an analytical reagent

Willard, H. H.; Smith, G. McP.

doi:10.1021/ac50133a014

Cited by 34 publications

(16 citation statements)

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“…Precipitation in the classical manner, as tetraphenyl arsonium perrhenate/pertechnetate (Willard and Smith, 1939), is selected for this purpose but, before this can be done, perchlorate must be thoroughly removed because this too forms an insoluble tetraphenyl arsonium salt. The rhenium and technetium are therefore first precipitated as sulphides, and this precipitate is washed free from perchlorate ions before redissolving in hydrochloric acid/hydrogen peroxide for the final precipitation of the mixed tetraphenyl arsonium salt.…”

Section: The Form Of 99mentioning

confidence: 99%

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Determination of technetium-99 in environmental material with rhenium as a yield monitor

Harvey

Williams

Lovett

et al. 1992

Journal of Radioanalytical and Nuclear Chemistry, Articles

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Section: The Form Of 99mentioning

confidence: 99%

“…This compound has been shown to possess excellent characteristics as a gravimetric reagent for rhenium (Willard and Smith, 1939). Figure 3 seems to indicate that the rhenium starts to precipitate before the technetium, and may indeed act as a scavenging agent for the very small mass of 99 Tc present.…”

mentioning

confidence: 98%

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Harvey

Williams

Lovett

et al. 1992

Journal of Radioanalytical and Nuclear Chemistry, Articles

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“…While these elements would not interfere with the assay method for rhenium, several others which were reported at the 0.02 to 0.05 percent concentration range could interfere. Among these elements were molybdenum, vanadium, tungsten, bismuth, mercury, tin, silver, lead, and , platinum all of which interfere with the assay of c:; rhenium by tetraphenylarsonium chloride [20,21] by forming insoluble compounds.…”

Section: Purification Of the Separated Isotopesmentioning

confidence: 99%

Absolute isotopic abundance ratio and atomic weight of a reference sample of rhenium

Gramlich¹,

Murphy²,

Garner³

et al. 1973

J. RES. NATL. BUR. STAN. SECT. A.

126

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,An absolute value has been obtained for the isotopic abundance ratio of a reference sample of rhenium, using surface emission mass spectrometry. Samples of known isotopic composition , prepared from nearly isotopically pure se parat ed rhenium isotopes , were used to calibrate the mass spectrometers. The resulting absolute '85 Re/'·7 Re ratio is 0.59738 ± 0.00039, which yields atom per· cents of ' 8s Re=37 .398±0.016 and '87Re=62.602±0.016. The atomi c weight calculated from this isotopi c c omposition is 186.20679 ± 0.00031. The indi cated uncertainties are overall limits of e rror based on 95 perce nt confidence limits for th e mean and allowances for the effe cts of known sources of possible systematic error.

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“…Citrate and oxalate are particularly troublesome in this respect. However, Willard and Smith (1) found that moderate amounts of tartrate and acetate did not interfere with their method. Nitrate, sulfate, potassium, and sodium ions are without effect in the method.…”

Section: Interfering Substancesmentioning

confidence: 97%

Amperometric Titrations of Sn[sup IV] and Hg[sup II] with Tetraphenylarsonium Chloride

Kolthoff¹,

Johnson²

1951

J. Electrochem. Soc.

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Sn Iv and Hg H can be titrated amperometrically with tetraphenylarsonium chloride using the dropping mercury electrode as the indicator electrode. Procedures are given and the limitations of the method are discussed.The use of tetraphenylarsonium chloride (denoted as TPAC) as a reagent in the indirect determination of mercuric, stannic, cadmium, and zinc ions has been described by Willard and Smith (1). These determinations involve formation of insoluble tetraphenylarsonium salts of the chloro-complexes of the metal ions and subsequent determination of the excess TPAC by potentiometric titration with iodine (2).Certain features of the reactions of TPAC with stannic and mercuric chlorocomplexes suggest their use in amperometric titrations. First, attainment of equilibrium is rapid. Second, the precipitates have a low solubility. Third, both mercuric and stannie ions yield suitable diffusion currents.The amperometric titration permits a direct determination of the metal ions and represents a considerable saving in time over the indirect method. DETERMINATION OF STANNIC [ONThis determination of tin is based on the reactionCurrent before the end point is derived from the stannic-stannous wave, which is catalyzed by TPAC (3). In 3N hydrochloric acid, the current may be measured at -0.3 volt vs. S.C.E.Because tin must be in the form of the hexachlorostannate complex to react with tetraphenylarsonium ion, a certain lower limit of chloride concentration is indicated for the titration. Furthermore, the acidity must be high enough to prevent hydrolysis of the hexachloro-complex. If both the acidity and chloride concentrations are less than 2N, quantitative precipitation does not occur and the attainment of equilibrium is slow. If the concentration of chloride is 2-4M, good precipitation lines and precision are 1 Manuscript received December 14, 1950. 231 obtained even when the concentration of hydrogen ion is as low as IN. Above 4M chloride, the points on the precipitation line are not linearly related; in particular, currents obtained in the beginning of the precipitation are less than theoretical, but closer to the end point the current approaches the expected values. For best results, the chloride concentration should be maintained at approximately 3-4M.The effects of variation in hydrogen-ion concentration are not as marked as the effects associated with chloride variations. In mixtures containing 2-3M chloride which are 1N in acid the results are slightly higher and the titration curves are not as well defined as in 2N acid. In 5N acid the results tend to be a little low. The best range of acidity is between two and four normal. This acidity can be lowered to 1N without seriously affecting the results, at a total chloride concentration of 2-3N. Procedure

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Tetraphenylarsonium chloride as an analytical reagent

Cited by 34 publications

References 0 publications

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Determination of technetium-99 in environmental material with rhenium as a yield monitor

Absolute isotopic abundance ratio and atomic weight of a reference sample of rhenium

Amperometric Titrations of Sn[sup IV] and Hg[sup II] with Tetraphenylarsonium Chloride

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