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| | | Forum Member
 
Group: Forum Members
Last Login: 10/9/2008 5:29:48 PM
Posts: 42, Visits: 131 |
| | I'm looking for a reference or procedure for "Substances Oxidizable by Permanganate" or "Substances Reducing Permanganate". We are testing sulfuric acid per a customer's specs. The only method I've found is a presence/absence test in an old Merck book, but the spec is "5 mL max", so I need something quantitative. |
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| | | Supreme Being
Group: Forum Members
Last Login: 10/6/2008 3:10:37 PM
Posts: 166, Visits: 219 |
| I know of a method that does this and expresses the value as "COD" chemical oxygen demand. If you look in the Hach Water Analysis Handbook 4th edition on page 751 there is a method for Manganese III oxidation there. Years ago this was how chemical oxygen demand was first performed, now dichromate is the norm. The problem I see that you might have is whether or not you want to heat the sample or not. Does your client want the compounds that are oxidizable at a particular temperature? There will be a significant difference in the amount of oxidizable material found at room temperature and at 150 degrees. You could also make a standard KMnO4 solution then titrate an aliquot of the acid with it at room temperature. When the oxygen demand of the sample is exhausted you would have a slight purplish color in the water solution. You could then calculate the amount of oxygen that would equate to. Anyway, there is a method for this, but it is adapted as a substitute for COD. You might be able to do this test without any heating whatsoever. Feel free to email me if you would like some help developing a simple test for this.
Christopher Fair
R&D Chemist III
Hach Company
cfair@hach.com
www.boddoctor.com |
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