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8 - REE Assay Package by Fusion ICP & ICP/MS

Rare earths and rare elements are among the most difficult to analyze properly. It is essential that the sample be ground to 95% -200 mesh to ensure complete fusion of resistate minerals. This analysis uses a lithium metaborate/tetraborate fusion with subsequent analysis by ICP and ICP/MS. Mass balance is employed as an additional quality control technique and elemental totals of the oxides should be between 98 to 101%.

 

In certain circumstances the presence of small amounts of phosphate will have very severe consequences to Nb2O5 assays by this method with results being very low for Nb2O5. Reanalysis is required for Nb2O5 by fusion XRF. In many cases these types of deposits can contain high amounts of fluorite. This should be noted on the Request for Analysis form or F assays should be requested. This will speed up processing as mass balance won’t be achieved otherwise and a delay in returning results will ensue as samples get repeated.

 

IN NO CIRCUMSTANCES SHOULD AN ACID DIGESTION OF ANY TYPE BE USED TO EVALUATE THE ABOVE ELEMENTS AS THEY WILL ONLY BE PARTIAL ANALYSIS.

 

If samples contain >0.3% P2O5 then Nb2O5 and ZrO 2  are recommended to be replaced by fusion XRF as ICP-MS results may be very low.    

 

Fusion ICP

Oxide

Detection

Limit (%)

SiO2

0.01

Al2O3

0.01

Fe2O3

0.01

MgO

0.01

MnO

0.001

CaO

0.01

TiO2

0.001

Na2O

0.01

K2O

0.01

P2O5

0.01

Loss on Ignition

0.01

 

Trace Elements and Detection Limits (ppm)

Element

Detection Limit

Reported By

 

Element

Detection Limit

Reported By

Ag

0.5

ICP/MS

 

Nd

0.1

ICP/MS

As

5

ICP/MS

 

Ni

20

ICP/MS

Ba

3

ICP

 

Pb

5

ICP/MS

Be

1

ICP

 

Pr

0.05

ICP/MS

Bi

0.4

ICP/MS

 

Rb

2

ICP/MS

Ce

0.1

ICP/MS

 

Sb

0.5

ICP/MS

Co

1

ICP/MS

 

Sc

1

ICP

Cr

20

ICP/MS

 

Sm

0.1

ICP/MS

Cs

0.5

ICP/MS

 

Sn

1

ICP/MS

Cu

10

ICP/MS

 

Sr

2

ICP

Dy

0.1

ICP/MS

 

Ta

0.1

ICP/MS

Er

0.1

ICP/MS

 

Tb

0.1

ICP/MS

Eu

0.05

ICP/MS

 

Th

0.1

ICP/MS

Ga

1

ICP/MS

 

Tl

0.1

ICP/MS

Gd

0.1

ICP/MS

 

Tm

0.05

ICP/MS

Ge

1

ICP/MS

 

U

0.1

ICP/MS

Hf

0.2

ICP/MS

 

V

5

ICP

Ho

0.1

ICP/MS

 

W

1

ICP/MS

In

0.2

ICP/MS

 

Y

2

ICP

La

0.1

ICP/MS

 

Yb

0.1

ICP/MS

Lu

0.04

ICP/MS

 

Zn

30

ICP/MS

Mo

2

ICP/MS

 

Zr

4

ICP

Nb

1

ICP/MS

 

 

 

 

 

 

Options:  

Code 8 – XRF Nb2O5, ZrO2 & Ta2O (0.003%)

Code 4F – F (0.01%) by ISE

 


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