Permanganate index: Difference between revisions

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{{Short description|Assessment of water quality}}

The principle of the method specified is heating a sample in a boiling water-bath with a known amount of potassium permanganate und sulfuric acid for a fixed period time (10 min), reducing part of the permanganate by oxidizable material in the sample and determining the consumed permanganate by addition of an excess of oxalate solution, followed by titration with permanganate. Applies to waters having a cloride ion concentration of less than 300 mg/l. Samples having a permanganate index over 10 mg/l should be diluted before analysis. The lower limit of the optimum range of the test is 0,5 mg/l.

{{See also|Analysis of water chemistry|Environmental monitoring#Sampling methods|Water sampling station}}

<ref>{{cite web|url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=15669|accessdate=23 November 2011}}</ref>

The '''permanganate index''' is an assessment of [[water quality]]. It involves the detection of [[oxidation]] by [[potassium]] [[permanganate]] in an [[acid]] medium under hot conditions.

The principle of the method specifiedis isto heatingheat a sample in a [[boiling]] water-bath with a known amount of potassium permanganate undand [[sulfuric acid]] for a fixed period time (10 min),. reducing partPart of the permanganate will be reduced by oxidizable material in the sample. and determining theThe consumed permanganate can be determined by addition of an excess of [[oxalate]] [[Solution (chemistry)|solution]], followed by [[titration]] with permanganate. AppliesThe method applies to waters having a cloride[[chloride ion]] concentration of less than 300 &nbsp;mg/lL. Samples having a permanganate index over 10 &nbsp;mg/lL should be [[Concentration|diluted]] before analysis. The lower limit of the optimum range of the test is 0,.5 &nbsp;mg/lL.

<ref>{{cite web|title=Water quality -- Determination of permanganate index|url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=15669|publisher=ISO|accessdate=23 November 2011}}</ref>

The permanganate index method is not recommended for [[waste water]] because some [[organic compound]]s are not oxidized or incompletely oxidized.

==See also==

*[[Permanganate]]

== References ==

{{reflist}}

[[Category:Chemical tests]]

[[Category:Permanganates]]