Enzyme Selective Extraction (ESE) is one of the most discriminating of the selective analytical extractions in use today. This selective extraction targets amorphous mixed oxide coatings. By selectively removing the amorphous manganese dioxide from these coatings, the mixed oxide coatings collapse, releasing trapped trace elements. A t this time, the greatest depth of penetration of ESE for a mineral deposit is greater than 800 m.
The High Salt ESE package is recommended for soils sampled in high salt environments.
A 0.75 g sample of -60 mesh B soil horizon material is leached in enzyme matrix containing a glucose oxidaze solution at 30°C for 1 hour. The enzyme reacts with amorphous MnO2 dissolving it. The metals are complexed with the gluconic acid present. Two controls for every 49 samples are leached in the same procedure.
The solutions are analyzed on an ICP-MS. One matrix blank is analyzed per 49 samples. Two controls are run at the beginning and end of the group of 49 samples. Duplicate samples are leached and run every 10 samples.
Code 7 High Salt Enzyme Selective Extraction Elements and Detection Limits (ppb)
*Values are Semi-Quantitative