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7 - Sequential Leach

Sequential leaches can target specific soil or rock phases and allow a better interpretation of the geochemical processes involved. There is a static and dynamic approach to the leaching.

The static approach, a sample will undergo sequentially a leaching process starting with the weakest leach to the strongest leach with subsequent analysis of each of the leachates by ICP-MS.

The dynamic approach involves sequential leaching on a sample packed column on-line with one leach following the other in close succession and then graphically examining the leaches (costs are dependent on the required protocol and number of leaches).

Some of the potential leaches which can be combined sequentially include from the weakest to the strongest:

Leach

Description

Code 7 - Deionized Water

This water soluble leach attacks any water soluble component or most labile bound components.  The leach is not buffered and can be affected by buffering the sample mineralogy.

Code 7 – Enzyme SE

Selectively goes after  amorphous Mn oxides

Code 7 - Bioleach

A leach proprietary to Actlabs that has been designed to extract dead bacterial remnants

Code 7 - Sodium Acetate Leach pH 5

For exchangeable cations adsorbed by clay and elements co-precipitated with carbonates

Code 7 - Sodium Pyrophosphate Leach

0.1M leach for elements adsorbed by organic material (humic and fulvic components)

Code 7- MIG Leach

For mobile metal components

Code 7 - Hydroxylamine Leach Cold

For amorphous Fe oxides and crystalline Mn Oxides

Code 7 -Hydroxylamine Leach Hot

For amorphous and crystalline Fe oxides and crystalline Mn oxides.

Code 7 - Aqua Regia

Will leach sulphide species and clay minerals

Code 7 - Four Acid Digestion

Will dissolve silicate remnant material remaining

 


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