Details

Autor(en) / Beteiligte

• Santasalo-Aarnio, Annukka
• Galfi, Istvan
• Virtanen, Jorma
• Gasik, Michael M

Titel

New analytical methodology for analysing S with a clear colour change. Could potentially replace the state-of-art-method iodometry at low pH analysis due higher accuracy

Ist Teil von

• PloS one, 2017-11, Vol.12 (11), p.e0188227

Ort / Verlag

Public Library of Science

Erscheinungsjahr

2017

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• A new, faster and more reliable analytical methodology for S(IV) species analysis at low pH solutions by bichromatometry is proposed. For decades the state of the art methodology has been iodometry that is still well justified method for neutral solutions, thus at low pH media possess various side reactions increasing inaccuracy. In contrast, the new methodology has no side reactions at low pH media, requires only one titration step and provides a clear color change if S(IV) species are present in the solution. The method is validated using model solutions with known concentrations and applied to analyses of gaseous SO.sub.2 from purged solution in low pH media samples. The results indicate that bichromatometry can accurately analyze SO.sub.2 from liquid samples having pH even below 0 relevant to metallurgical industrial processes.