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1F2 - 4-Acid "Near Total" Digestion - ICP

A 0.25 g sample is digested with four acids beginning with hydrofluoric, followed by a mixture of nitric and perchloric acids. This is then heated using precise programmer controlled heating in several ramping and holding cycles which takes the samples to incipient dryness. After incipient dryness is attained, samples are brought back into solution using aqua regia.


With this digestion, certain phases may be only partially solubilized. These phases include zircon, monazite, sphene, gahnite, chromite, cassiterite, rutile and barite.  Ag greater than 100 ppm and Pb greater than 5000 ppm should be assayed as high levels may not be solubilized.  Only sulphide sulfur will be solubilized.


The samples are then analyzed using an Agilent 735 ICP.  QC for the digestion is 14% for each batch, 5 method reagent blanks, 10 in-house controls, 10 samples duplicates, and 8 certified reference materials.  An additional 13% QC is performed as part of the instrumental analysis to ensure quality in the areas of instrumental drift.


Code 1F2 - Elements and Detection Limits (ppm except where noted)

Element

Detection Limit

Upper Limit

Element

Detection Limit

Upper Limit

Element

Detection Limit

Upper Limit

Ag

0.3

100

Ga

1

10,000

Sb

5

10,000

Al

0.01%

50%

Hg

1

-

Sc

4

10,000

As 

3

5,000

K

0.01%

10%

Sr

1

10,000

Ba 

7

1,000

Li

1

10,000

Te

2

10,000

Be

1

10,000

Mg

0.01%

50%

Ti

0.01%

10%

Bi

2

10,000

Mn

1

100,000

Tl

5

10,000

Ca

0.01%

70%

Mo

1

10,000

U

10

10,000

Cd

0.3

2,000

Na

0.01%

10%

V

2

10,000

Co

1

10,000

Ni

1

10,000

W

5

10,000

Cr 

1

10,000

P

0.001%

10%

Y

1

1000

Cu

1

10,000

Pb

3

5,000

Zn

1

10,000

Fe 

0.01%

50%

S+

0.01%

20%

Zr

5

10,000

 

Notes:  

Extraction of each element by 4-Acid Digestion is dependent on mineralogy.

+ Sulphide sulphur and soluble sulphates are extracted

Assays are recommended for values which exceed the upper limits.

 


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