|Analytical control within the sense of the standard STN 65 1091|
|Controlled parameters of sulfur quality|
The method is based on the extraction of acid compounds with distilled water followed by a titration of the extract with sodium hydroxide solution.
The method is based on the gravimetric determination. The content of organic compounds is equal to the difference of residual weight in the dish after annealing at 250 °C and at 800 ± 25 °C.
The method is based on the gravimetric determination. The ash content is calculated from the residue in the dish after annealing at 800 ± 25 °C.
The method is based on the less of the sulfur mass dried to a constant mass at 70 ± 2°C.
The di-isopropanol-amine is added into molten sulfur to decompose polysulphides into hydrogen sulphide. The content of bubbler is purged with gas – nitrogen, and the contained hydrogen sulphide in the sulphur as well as that from the polysulphides is collected in the sodium hydroxide solution. The content of hydrogen sulphide is determined using the potentiometric titration with silver nitrate.