Process and apparatus for the continuous calorimetric determination of the cyanide concentration in aqueous solutions
CA 1315651 C · Owner: Wolf, Hubert · Inventors: Wolf, Hubert; Bilger, Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the invention cyanide concentrations, of from about 0.001 to 5 mg cyanide/1 are continuously determined colorimetrically by the known cyanide-picric acid color reaction. The solution containing free cyanide and/or cyanide releasable from cyano complexes is reacted for 1 to 60 minutes at 50 to 120°C in a gastight closed system in the presence of chelating agents to form the color complex and the extinction value is measured by spectral photometry. The process avoids the extraction step hitherto necessary for cyanide concentrations below 0.2 mg CN/1 and errors attributable to HCN- outgassing losses is simple, to handler largely immune to interference and suitable for the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted April 6, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 6, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.