A Procedure for the Separation of the Six Platinum Metals from One Another and for their Gravimetric Determination<sup>1,2</sup>

Gilchrist, Raleigh; Wichers, Edward

doi:10.1021/ja01315a075

Cited by 111 publications

(28 citation statements)

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“…= 0.0018 + 1742 C After the calibration curve has been established as in Figure 2, it is used in either of two ways. The absorbancy of a solution having been determined, the estimated concentration, C,, may either be read from the plot or calculated from the relation: C, = 10-'(5.7428, -0.0102) (6) I n either case the variance of the slope of the line appears in the estimated concentration. The standard deviations, S,, and the 95% confidence intervals of the estimated concentrations for various absorbancies are given in Table 11.…”

Section: Precision Of Methodmentioning

confidence: 99%

“…However, the time required and the tedium involved in the procedure prompted an investigation of spectrophotometric methods. The methods of DeFord (6) and Breckenridge and Singer (3) were considered too sensitive for this application. Other spectrophotometric methods have been proposed (lb), but they have not been developed sufficiently for general application.…”

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confidence: 99%

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Spectrophotometric Determination of Ruthenium

Marshall¹,

Rickard²

1950

Anal. Chem.

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VOLUME 2 2, NO. 6, JUNE 1950 795 Table IV shows the half-wave potentials resulting from the electrolyses of 2.439 X 10 "4 molar nitroparaffin solutions, all buffered at pH 4.0. The diffusion currents for each remained constant, within the limits of experimental error, regardless of the buffer solution employed. However, each compound is more easily reduced in the citric acid-disodium phosphate buffer or in the acetate buffer than in either the benzoate or phthalate buffers. Although no explanation of this phenomenon can be given here, it seems logical that these differences may be due to adsorption phenomena at the dropping mercury cathode, or to possible differences in the tautomeric equilibria of the nitroparafhns in different media. In any event, it is clear that the type and concentration of buffer used must be given in order for B1/j to have significance. The dependence of the polarographic reduction of aromatic nitro groups on the buffer system has already been suggested (4).

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Section: Precision Of Methodmentioning

confidence: 99%

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confidence: 99%

Spectrophotometric Determination of Ruthenium

Marshall¹,

Rickard²

1950

Anal. Chem.

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“…Osmium and fluorine were distilled from a n all-glass distilling apparatus (10) and collected in ice-cold 6 N sodium hydroxide. The osmium was then purified by slightly acidifying the distillate with hydrochloric acid and extracting the osmium tetroxide twice with carbon tetrachloride (11).…”

Section: ( C ) Chemical Separations and Chenzical Yieldsmentioning

confidence: 99%

The Spallation of Iridium With Protons of Energies 9–87 Mev

Grant¹,

Yaffe²

1963

Can. J. Chem.

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Iridium metal has been bombarded with protons varying in energy from 8 to 87 Mev. The spallation products were radiochemically separated and decay characteristics and formation cross sections were determined. I t was confirmed that both Pt187 and Pt18%ave half-lives of about 3 hr, and a half-life of 1 3 . 3 3~ 0.2 days was found for IrlS9. An isomeric state of Irla6 with half-life 2.0f 0.5 hr has been found. Fair agreement was obtained between excitation functions for (p,xn) reactions determined experimentally and those predicted by the Jackson model.The (p,pn) yield a t 84 Mev has been compared with that calculated from Monte Carlo cascade data combined with evaporation theory and found to be too high by a factor of 4.

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“…We determined that our primary method would be gravimetric, which is directly traceable to the SI kilogram. The literature offered guidance in developing this method. − Ammonium hexachloroosmate, (NH 4 ) 2 OsCl 6 , a common water-soluble Os salt, was chosen as the starting material for the Os solution standard. A gravimetric reduction (GR) procedure to assay for Os in the (NH 4 ) 2 OsCl 6 was developed.…”

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confidence: 99%

Tracing an Osmium Solution Standard to the International System of Units (SI)

Gozzi¹,

Gaines²,

Kozikowski³

et al. 2021

Anal. Chem.

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The purpose of this work was to develop an accurate osmium (Os) solution standard that is traceable to the International System of Units, the SI. A gravimetric reduction (GR) method was developed to accurately assay the Os in ammonium hexachloroosmate salt, (NH4)2OsCl6, the chosen starting material for the Os solution standard. This GR method was also applied to −200 mesh high-purity Os metal powder, which served as an independent source of Os for comparison. An alkali fusion method was developed to create water-soluble salts from the Os metal GR products of both the (NH4)2OsCl6 and −200 mesh high-purity Os metal powder. Quantitatively prepared Os solutions from each of these water-soluble salts were compared by inductively coupled plasma spectrometry, ICP-OES. The purities of the Os starting materials were determined by quantitatively performed trace metallic impurities analysis, by ICP-OES and ICP-MS; the O, N, and H impurities were determined by inert gas fusion analysis. The percent purities of the starting materials were applied as corrections to the Os assay results obtained by GR. The agreement between these Os solutions, corrected for random and systematic errors by error budget analysis, confirmed the accuracy of the Os assay in the (NH4)2OsCl6. The SI traceability of the Os assay in the (NH4)2OsCl6 salt was established through the GR procedure and the purity analysis of this material. An SI traceable Os solution standard was gravimetrically prepared from this batch of (NH4)2OsCl6, based on the accurate Os assay and the percent purity of the starting material.

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A Procedure for the Separation of the Six Platinum Metals from One Another and for their Gravimetric Determination^1,2

Cited by 111 publications

References 0 publications

Spectrophotometric Determination of Ruthenium

Spectrophotometric Determination of Ruthenium

The Spallation of Iridium With Protons of Energies 9–87 Mev

Tracing an Osmium Solution Standard to the International System of Units (SI)

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A Procedure for the Separation of the Six Platinum Metals from One Another and for their Gravimetric Determination1,2

Cited by 111 publications

References 0 publications

Spectrophotometric Determination of Ruthenium

Spectrophotometric Determination of Ruthenium

The Spallation of Iridium With Protons of Energies 9–87 Mev

Tracing an Osmium Solution Standard to the International System of Units (SI)

Contact Info

Product

Resources

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A Procedure for the Separation of the Six Platinum Metals from One Another and for their Gravimetric Determination^1,2