Determination of iridium in mafic rocks by atomic absorption

Grimaldi, F.S.; Schnepfe, Marian M.

doi:10.1016/0039-9140(70)80010-8

Cited by 16 publications

(2 citation statements)

References 3 publications

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“…3. The low concentration standards for iridium described by Grimaldi and Schnepfe (1970) are also used as secondary standards.…”

Section: Preparation Of Standards (Monitors)mentioning

confidence: 99%

A manual on fire assaying and determination of the noble metals in geological materials

Haffty¹,

Riley²,

Goss³

1977

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Detailed directions are given for use of fire-assay techniques to separate and concentrate the noble metals Ag, Au, Ir, Os, Pd, Pt, Rh, Ru from many varieties of samples. Included are procedures for selecting appropriate assay charges based on approximate chemical compositions of the samples. Whenever such data are available, a saving of time by avoiding reruns is generally possible even with minimal mineralogical information. Also included are descriptions of methods currently being used by the U.S. Geological Survey for the determination of the various noble metals, mostly after concentration by fire assay.

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“…3. The low concentration standards for iridium described by Grimaldi and Schnepfe (1970) are also used as secondary standards.…”

Section: Preparation Of Standards (Monitors)mentioning

confidence: 99%

A manual on fire assaying and determination of the noble metals in geological materials

Haffty¹,

Riley²,

Goss³

1977

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“…Gold, Pd, and Pt form an alloy with both Au and Ag. For Rh and Ir, best recoveries are obtained using a Au inquart (Grimaldi and Schnepfe 1970). Osmium and Ru suffer a great loss during cupellation, because they readily form volatile oxides (Van Loon and Barefoot 1991).…”

mentioning

confidence: 99%

Comparison of Silver and Gold Inquarting in the Fire Assay Determination of Palladium/Platinum and Rhodium in Geological Samples

Suominen

Kontas

Niskavaara

2004

Geostandard Geoanalytic Res

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The classical lead fire assay is still the most important method for the pre‐concentration and separation of Ag, Au and some of the platinum‐group elements (PGE) in the analysis of geological materials. The most frequently used fire assay procedure is the determination of Au, Pd and Pt with Ag as collector. When Au is used instead of Ag as a collector, Pd, Pt, Rh and possibly Ir can also be determined. In this study the recoveries by Au and Ag collectors, also called inquarts, were compared in the fire assay analysis of Pd, Pt and Rh in geological reference materials. The amount of gold to be added was optimised. Variable recoveries were obtained with Ag inquart for Rh, but a 2 mg inquart of Au gave good recoveries for all three of these elements in the analysis of reference samples of different geological materials. A procedure, alternative to scorification, to overcome interferences caused by base metals in the cupellation step is presented. The procedure involves cutting the Pb button into pieces and analysing the pieces separately. Prior to this, a homogeneity study of the lead button was made, and it showed that Pd, Pt and Rh were evenly distributed in the Pb button. All determinations were made using inductively coupled plasma‐atomic emission spectrometry (ICP‐AES).

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Bibliography

1998

Atomic Absorption Spectrometry

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Determination of iridium in mafic rocks by atomic absorption

Cited by 16 publications

References 3 publications

A manual on fire assaying and determination of the noble metals in geological materials

A manual on fire assaying and determination of the noble metals in geological materials

Comparison of Silver and Gold Inquarting in the Fire Assay Determination of Palladium/Platinum and Rhodium in Geological Samples

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