AOAC Test Method 920.203


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Source:
AOAC

Method Name:
Manganese in Water. Official Name: Manganese in Water by Persulfate Method

Description:
Evaporate samples to dryness per AOAC Method 920.202. Redissolve the remaining insoluble with HNO3 (1+1), evaporate again to dryness, and then treat with water, HNO3 and a little AgNO3 solution. If precipitate of AgCl appears, additional AgNO3 is added to remove the remaining silver, then filter to remove precipitate. Add ammonium persulfate to the filtrate, and heat over a steam bath until a pick color develops (after approximately 20 minutes). Compare color to a set of known standards prepared in a similar fashion.

Scope:
This method is applicable to the determination of manganese in water by colorimetry.

Citation:
Official Methods of Analysis of AOAC International, 16th Edition, 4th Revision, 1998 Volume I

Media:
WATER

Subcategory:
Inorganic

Revision Number:
Mar-96

Analytical testing dots

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Analytical testing dots