Metrohm presents a method for completely automated
determination of the permanganate index according to DIN EN ISO 8467 (DIN
38409-5). The new method not only saves time, but is robust and, because of the
tiamo
TM titration software, very easy to use.
The permanganate index is used to evaluate the quality of
different types of water, e.g. drinking water, mineral water, spring water, and
table water. It is determined in accordance with DIN EN ISO 8467 (DIN 38409-5).
For titrimetric determination, the water sample is heated
with a KMnO4 solution of known concentration and sulfuric acid in a boiling
water bath for 10 minutes. In the process, some of the permanganate oxidizes
the oxidizable constituents in the water. The exact consumption of permanganate
is determined by adding an excess of sodium oxalate solution and then titrating
the excess oxalate with permanganate solution.
The determination of the permanganate index is a standard
application performed in almost all water laboratories but it is not without snags.
In particular, keeping the quality of sample preparation consistent - including
the time-critical heating of samples - is a challenge, especially if it is done
manually under the pressure of a high sample throughput.
The method developed by Metrohm solves this problem
efficiently and reliably. The key lies in a heatable, external cell, with which
the heating of the samples is handled automatically. Users just have to place
the samples on the rack of the sample processor and start the system. The transfer
of the sample to the external titration cell and all the other sample
preparation steps as well as the titration itself, are performed automatically
ensuring highest reproducibility and consistent quality.
Download
the application note
Subscribe to any of our newsletters for the latest on new laboratory products, industry news, case studies and much more!
Request your free copies HERE
Popular this Month
Top 10 most popular articles this month
Today's Picks
Looking for a Supplier?
Search by company or by product
Please note Lab Bulletin does not sell, supply any of the products featured on this website. If you have an enquiry, please use the contact form below the article or company profile and we will send your request to the supplier so that they can contact you directly.
Lab Bulletin is published by newleaf marketing communications ltd.