{{See also|Analysis of water chemistry|Environmental monitoring#Sampling methods|Water sampling station}}
DetectionThe '''permanganate index''' is an assessment of oxidization[[water quality]]. It involves the detection of [[oxidation]] by [[potassium]] [[permanganate (permanganate index)]] 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 and sulphuric[[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 mg/lL. Samples having a permanganate index over 10 mg/lL should be [[Concentration|diluted]] before analysis. The lower limit of the optimum range of the test is 0.5 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 Permanganatepermanganate Indexindex method is not recommended for [[waste water]] due to the fact thatbecause some [[organic compoundscompound]]s are not oxidized or incompletely oxidized.
