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1B1 - Nickel Sulphide Fire Assay -PGE- INAA

Samples up to 25 g in size are fire assayed using a nickel sulphide (NiS) fire assay procedure. The nickel sulphide button is dissolved in concentrated HCl and the resulting residue which contains all the PGE and Au are collected on a filter paper. This residue undergoes 2 irradiations and 3 separate counts to measure all the PGE and Au. One batch of 34 samples includes 2 blanks, 3 certified standards and 3 duplicates.

 

INAA Finish

Instrumental Neutron Activation Analysis (INAA) is an analytical technique which is dependent on measuring gamma radiation induced in the sample by irradiation with neutrons. The primary source of neutrons for irradiation is usually a nuclear reactor. Each element which is activated emits a “fingerprint” of gamma radiation which can be measured and quantified.  Multi-element analyses of practically any material, from the smallest sample which can be weighed accurately to very large samples, have been analyzed routinely by INAA. 

 

 

Code 1B1 (NiS Fire Assay-INAA) Elements and Detection Limits (ppb)

Element

Detection

Limit

Upper

Limit

Os

2

20,000

Ir

0.1

10,000

Ru

5

50,000

Rh

0.2

20,000

Pt

5

100,000

Pd

2

100,000

Au

0.5

20,000

Re

5

50,000

 

 

Reference :

Hoffman, E.L., 1992.  Instrumental Neutron Activation in Geoanalysis.  Journal of Geochemical Exploration, volume 44, pp. 297-319.

 

Hoffman, E.L., Naldrett, A.J., Van Loon, J.C., Hancock, R.G.V. and Manson, A., 1978. The determination of all the platinum group elements and gold in rocks and ore by neutron activation analysis after preconcentrating by a nickel sulphide fire-assay technique on large samples.  Anal. Chim. Acta, volume 102, pp. 157-166.

 


Activation Laboratories Ltd. | 41 Bittern Street, Ancaster, Ontario, L9G 4V5, Canada | TF: +1.888.228.5227
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