Partial Digests

TerraLeach(TM) PARTIAL DIGEST GEOCHEMISTRY.

Genalysis has developed an extensive suite of partial digest solutions to cover a wide variety of regolith terrains and element suites. The digest solutions contain a variety of complexing agents, weak acids, weak bases or salts in various combinations. The low total dissolved salt content for many of the digests enables determination of trace elements to very low detection levels.

Before commencing any new Partial Digest geochemistry program we would recommend consultation. Initial consultation is free. An orientation study to help select the optimum sample media and digestion technique is always a good investment.

Preparation
Raw samples are air dried, and up to 100g may be digested generally without further preparation. Some sieving to recover the finer fraction may be recommended in certain terrains.

Digestion TL0
A de-ionised water leach for water-soluble species. Potentially useful in salt lake environments or in acid soils.

Digestion TL1
Fine particulate Au and ionic Au. Very efficient for pathfinder elements Cu, Ag, Ni, Co, Hg, As, Se, Mo, Sb and W. Some other base metals may be recovered from acidic soils depending on speciation of metals in those soils. Our most popular partial digest where Au is the prime element of interest.

Digestion TL2
A weak acid/complexing agent based digest specific for base metals in non-alkaline soils.

Digestion TL3
A very weak acid based digest designed to de-sorb base metals and other elements in non-alkaline soils.

Digestion TL4
A relatively strong digest using a weak acid/complexing agent mix. Particularly effective for the recovery of Pb and Zn in alkaline soils.

Digestion TL5
A weak salt based digest for base metals in organic or acidic soils.

Digestion TL6
Similar to TL1, but with a weaker leachant for dominantly non-particulate Au.

Digestion TL7
A relatively stronger acid digest to dissolve amorphous Fe and Mn oxide/hydroxide species. Elements lithologically generated also extracted. For enhanced anomaly definition in lieu of conventional soil geochemistry.

Digestion TL8
Similar to TL1 but modified to give improved recovery of base metals and uranium.

Digestion TL9
A modified Na pyrophosphate digest for humic and fulvic acid rich soils. Good for most elements. Significant amounts of Au and Ag recovered also.

Digestion TL10
Using 0.1M hydroxylamine hydrochloride to dissolve amorphous Mn oxides.

Digestion TL11
Using 0.25M hydroxylamine hydrochloride to dissolve amorphous Mn and Fe oxides.

Digestion TL12
Using 1M hydroxylamine hydrochloride to dissolve amorphous and crystalline Fe and Mn oxides.

Digestion TL13
Using 1M ammonium acetate (pH5) to dissolve carbonates and to de-sorb surface bound metal cations.

Digestion cost
TL0, TL1, TL2, TL3, TL5, TL6, TL7, TL8, TL9, TL10, TL11, TL12, TL13. $8.00 sample
TL4 $16.00 sample

Elements by AAS
Method code TL0/AAS; TL1/AAS; TL2/AAS; TL3/AAS; TL4/AAS; TL5/AAS; TL6/AAS; TL7/AAS; TL8/AAS; TL9/AAS; TL10/AAS; TL11/AAS; TL12/AAS; TL13/AAS
Ag (0.01) Cd (0.01) Co (0.1) Cr (0.05) Cu (0.01) Fe (0.02) Mn (0.01)
Ni (0.05) Pb (0.05) Sb (0.05) Te (0.1) Tl (0.05) Zn (0.01)
$2.50 each

Elements by OES
Method code TL0/OES; TL1/OES; TL2/OES; TL3/OES; TL4/OES; TL5/OES; TL6/OES; TL7/OES; TL8/OES; TL9/OES; TL10/OES; TL11/OES; TL12/OES; TL13/OES
Al (0.1) Ca (0.1) Cr (0.1) Cu (0.1) Fe (0.1) K (0.1) Mg (0.1)
Mn (0.1) Na (1) 1 Ni (0.1) P (1) S (1) Sc (0.1) Si (0.5)
Ti (0.1) V (0.1) Zn (0.1)
first element $7.50
subsequent elements $0.75 each

Elements by MS (Note: all detection limits are in ppb except where noted)
Method code TL0/MS; TL1/MS; TL2/MS; TL3/MS; TL4/MS; TL5/MS; TL6/MS; TL7/MS; TL8/MS; TL9/MS; TL10/MS; TL11/MS; TL12/MS; TL13/MS
Ag (0.05) As (0.5) Au (0.01) Ba (0.001ppm) Be (0.5) Bi (0.1) Cd (0.1)
Ce (0.01) Co (0.5) Ca (0.005) 1 Cu (0.005 ppm) Dy (0.01) Er (0.005) Eu (0.005)
Ga (0.1) Gd (0.005) Ge (0.5) Hf (0.02) Hg (0.5) Ho (0.005) In (0.01)
La (0.01) Li (0.2) Lu (0.005) Mo (0.2) 2 Nb (0.02) Nd (0.01) Ni (0.005 ppm)
Pb (0.002 ppm) Pd (2) Pr (0.005) Pt (0.05) Rb (0.1) 1 Re (0.005) 1 Ru (0.05)
Sb (0.05) Se (2) Sm (0.01) Sn (0.5) Sr (0.1) 1 Ta (0.005) Tb (0.005)
Te (0.5) Th (0.02) Tl (0.05) Tm (0.005) U (0.02) W (0.1) Y (0.02)
Yb (0.01) Zn (0.05 ppm) Zr (0.1)
first element $10.00
subsequent elements $1.00 each
Hg as a subsequent element $2.50

For Digests TL4 and TL7, the ICP-MS detection limits are 10 times those shown.
For Digests TL9, TL10 and TL11 the ICP-MS detection limits are 20 times those shown.
For Digests TL12 and TL13 the ICP-MS detection limits are 100 times those shown.

Detection limits may increase if inconvenient sample materials are encountered. This may typically occur when weak acids are applied to strongly alkaline soils and vice versa.
Lower limits of detection may be achieved for some elements under special operating conditions.

Note:
1. Na, Cs, Rb, Re and Sr not available by digestions TL1, TL6, TL8 and TL9.
2. Mo detection limit is 2ppb for digestions TL1, TL6 and TL8