SkExtragent LLC — Skolkovo resident
Extragent DOS
Analytical-grade di-n-octyl sulfide for solvent extraction of gold, silver, platinum and palladium before atomic absorption and ICP-OES
- Certificate of analysis for each batch
- Shelf life not less than 5 years
- Sulfide extraction of gold since the 1960s
(C8H17)2SDi-n-octyl sulfide
Applications
Gold in ores and solutions
Extraction of gold with a DOS solution, usually in toluene (ideally aviation kerosene), then flame AAS (from 0.05 g/t) or ICP-OES (from 0.003 g/t).
High-purity Au, Ag, Pd
Separation of the metal matrix for determination of 22–26 trace impurities at 10⁻⁸–10⁻⁶ %.
Chloride solutions
Fast, selective extraction of gold and palladium from acidic chloride solutions in refining and secondary processing. Not suitable for cyanide liquors.
Why DOS
- Constant composition, unlike petroleum sulfides of variable origin.
- No unpleasant odour.
- Higher sulfide sulfur content — lower reagent consumption.
- Determines gold concentrations that petroleum sulfides and dibutyl sulfide cannot reach.
- Of the accompanying metals practically only palladium is co-extracted with gold; iron does not interfere.
About the company
Organic sulfides were developed as selective gold extractants in the Novosibirsk Akademgorodok in the early 1960s; di-n-octyl sulfide proved the most effective. Gold extraction with organic sulfides became the standard in geological and plant laboratories of the USSR and Russia; GOST 27973.3-88 (impurities in 99.9% gold) uses dibutyl sulfide and explicitly allows other extractants of no lesser extraction capacity.
Extragent LLC (Novosibirsk, Russia; Skolkovo resident) produces Extragent DOS with a main substance content of not less than 98.8% using a simple and relatively inexpensive synthesis technology.
Test it on your samples
We provide 30 mL of Extragent DOS free of charge — enough for a full check on your samples.