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Analytical Control Of Hypophosphite Anion

IP.com Disclosure Number: IPCOM000095399D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Geist, T: AUTHOR

Abstract

An accurate quantitative analysis for hypophosphite anion in the presence of phosphite ions is obtainable. The automated colorimetric determination is based on the reduction of the phosphomolybdate complex. The mixing of the reagents with the sample solution is automated to the extent that the time of the reaction is not a variable.

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Analytical Control Of Hypophosphite Anion

An accurate quantitative analysis for hypophosphite anion in the presence of phosphite ions is obtainable. The automated colorimetric determination is based on the reduction of the phosphomolybdate complex. The mixing of the reagents with the sample solution is automated to the extent that the time of the reaction is not a variable.

The following is an example of the colorimetric determination in which the hypophosphite anion is in the concentration of 20 g/l to 30 g/l, expressed as sodium hypophosphite-NaH(2)PO(2). H(2)O. The reagents are 100 g/l sodium molybdate in 2.5 N sulfuric acid and a 6% sulfurous acid aqueous solution. A
0.42 ml/minute water sample is continuously mixed with 3.9 ml/minute water. A
0.32 ml/minute portion of the mixture is fed and mixed with 3.9 ml/minute sodium molybdate-sulfuric acid reagent. A 2.5 ml/minute portion of this third mixture is mixed continuously with a 2.5-ml/minute portion of the sulfurous acid.

This final mixture is fed to the colorimeter where the light absorbance of the resultant complex is measured and recorded. Comparison of the sample against known standards is made in order to determine the solution concentration. The mixing process and light transmission characteristic. reading of the procedure are accomplished in a fixed time and at room temperature. This particular system uses colorimeter filters of either 760-770 millimicrons or 815-830 millimicrons with no interference...