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Method

FUSION

The sample is fused in a ceramic crucible with litharge, sodium carbonate, borax and flour at 1080ºC.

CUPELLATION

The 25-50 gram lead button is cupelled in a magnesite cupel at 900ºC for 60 minutes.

DIGESTION

The silver bead is parted with concentrated nitric acid. Hydrochloric acid is then added to generate chlorine and nitrosoyl chloride that dissolves the PGM sponge.

ANALYSIS

Gold, Palladium and Platinum may be determined by this technique. Digested samples are read on an ICP-AES. Parted prills can be weighed and reported as gold.

LIMITATIONS

ICP readings typically have a +/- 3-5% variation. Gravimetric determinations for gold and silver are less accurate at low levels (< 3 ppm) but more acurate (< 1% variation) above 3ppm than ICP. Gravimetric reported gold results include any palladium, platinum and retained silver.

DETECTION LIMIT: ICP, GRAVIMETRIC

METHOD  FA-Pb30FA-GRAVICP-2AAg
DIGESTFA-Pb30FA-Pb30D2A
WEIGHT30g30g0.5g
FINISHICP-OESGravimetricICP-OES
UNITSppmppmppm
RANGELDL-UDLLDL-UDLLDL-UDL
AuGold0.003-100.05-1,000,000X
AgSilverX7-1,000,0000.2-100
PdPalladium0.003-10XX
PtPlatinum0.005-10XX

Overrange result will trigger a Gravimetric Fire Assay repeat

Results can be reported in client requested units