Use of selective ion exchange paper in x-ray spectrography and neutron activation.  Application to the determination of gold

Green, Thomas E.; Law, Stephen L.; Campbell, W. J.

doi:10.1021/ac50160a044

Cited by 53 publications

(8 citation statements)

References 8 publications

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“…Determination of Gold. NMRR resin (formerly known by the designation SRXL) has been used by Green et al for the determination of gold in silicate rocks using both X-ray fluorescence and neutron activation to determine the gold content of resin loaded filter papers (19). Gold recovery was much less than complete so that a small quantity of the radioactive isotope 196Au was added to each sample to monitor recovery.…”

Section: Resultsmentioning

confidence: 99%

Application of chelating ion exchange resins for trace element analysis of geological samples using x-ray fluorescence

Blount¹,

Leyden²,

Thomas³

et al. 1973

Anal. Chem.

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abundance for any one permutation formula is larger than that for the original formula, the mass of the permutation formula is computed, and a check is made to determine the existence of an ion corresponding to that mass in the spectrum. If the ion corresponding to the more abundant permutation formula is not found, the less abundant original formula is rejected. In other words, if any one of the permutations which are more abundant is not found, the formula is unsatisfactory.The final printed output is shown in Table V for the same trichloroaniline spectrum as in Tables I and III.The columns give the observed mass of the ion, its intensity in per cent of tallest peak, the number of rings and double bonds for the formula, the ppm error between the observed mass and the mass calculated for the formula, and the formula. The ppm error averages 5-10 ppm, but worst-case error runs as high as 30-40 ppm. It is expected that this will improve when vibration is eliminated from the instrument, but a tolerance of 50 ppm between the formula and the observed mass is being used until then. It should be noted that even with a 50-ppm tolerance in the mass, most of the ions correspond to only one formula. Only one formula is given for the molecular ion at mass 194.93779. That formula is H4C6NCI3 which is correct for the sample, trichloroaniline. Peaks can be observed at 159.96703 corresponding to p-Cl; at 125.00142 corresponding to p-2Cl; and at 90.03779 corresponding to p-3Cl. The structure of the compound is well represented in the formulas derived as a final result of the data reduction. ACKNOWLEDGMENTWe wish to thank Paul Bender and his staff for their efforts and cooperation in the development of this work and Milt Levenberg of Abbott Laboratories, Chicago, 111., for his valuable advice and comments on various aspects of the approach to obtaining meaningful data.

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Section: Resultsmentioning

confidence: 99%

Application of chelating ion exchange resins for trace element analysis of geological samples using x-ray fluorescence

Blount¹,

Leyden²,

Thomas³

et al. 1973

Anal. Chem.

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“…Since publication of the original paper (20), the resin or resin-loaded paper has been used for the determination of Au (21)(22)(23) and Ir in rocks (24) by neutron activation or X-ray fluorescence spectrometry. It was also discovered that in addition to the noble metals, methylmercury and The samples were dried for 24 hours at 80 °C before taking aliquots for analysis.…”

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confidence: 99%

Determination of the noble metals in geological materials by neutron activation analysis

Nadkarni¹,

Morrison²

1974

Anal. Chem.

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“…Although its application to the determination of gold has been studied by a few workers (14,18,37,38), X-ray fluorescence, which is so useful in many fields of metallurgical chemistry, has not become established as a routine analytical procedure for the metal. This is disappointing because, as a general rule, elements of high atomic number such as gold are more amenable to determination by X-ray fluorescence than those of low number and, furthermore, the non-destructive nature of the technique could be advantageous in laboratory analyses of many materials for gold.…”

Section: X-ray Fluorescentementioning

confidence: 99%

Analysis for gold

Young¹

1980

Gold Bull

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Gold, by reason of its occurrence in the metallic state, was probably one of the first metals known to man. Its brilliant colour, high specific gravity, resistance to corrosion and excellent malleability have since given it a privileged place among metals. For several centuries in the medieval period, alchemists endeavoured to transmute base metals into gold; their efforts, of course, were unsuccessful but resulted in early knowledge of the chemical behaviour of gold and its compounds. From the beginning of quantitative chemical analysis, the high value of gold dictated careful sampling and a degree of analytical accuracy far greater than that required for all other metals except those of the platinum group.During the long association of man with gold, the determination of the latter in ores and metallurgical products has been generally carried out by fire assay. In this technique of analytical chemistry, the sample is mixed with appropriate fluxes and litharge in a crucible, .and is melted in a Turnace. Gold, having a weak af inity for non-metallic elements at high temperature, but a very streng affinity for the molten lead formed by reduction of litharge, is collected in a lead button. When the latter is heated under oxidizing conditions in a porous vessel called a cupel, the lead is rapidly oxidized to PbO which is 98.5 per cent absorbed by the cupel and 1.5 per cent volatilized, leaving the gold, and silver if present, in the form of a bead. Subsequent treatment with dilute nitric acid, termed 'parting', dissolves the silver, and the residue of gold is then weighed on a special type of balance which is sensitive to at least 0.005 mg.Though very important, fire assaying is not the only method used in the determination of gold. For many gold-bearing materials, gravimetric, volumetric and colorimetric procedures, or the techniques of atomic absorption, optical spectrography and X-ray tluorescence are employed.

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Use of selective ion exchange paper in x-ray spectrography and neutron activation. Application to the determination of gold

Cited by 53 publications

References 8 publications

Application of chelating ion exchange resins for trace element analysis of geological samples using x-ray fluorescence

Application of chelating ion exchange resins for trace element analysis of geological samples using x-ray fluorescence

Determination of the noble metals in geological materials by neutron activation analysis

Analysis for gold

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