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2011•Chinese Journal of Analysis LaboratoryRequires access

Quick determination of phosphorus in steel by microemulsion spectrophotometry

Dong Wen-li

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Abstract

Ethyl violet can form an adsorption ion-association complex with phosphorus-molybdenum-vanadium heteropoly acid at 0.7 ～ 1.0 mol/L sulfuric acid medium by using the nonionic(O/w) microemulsion(OP/n-C5H11OH/n-C7H16/H2O).The composition ratio of phosphorus-vanadium-molybdenum heteropoly acid / ethyl violet is 1:2.The maximum absorption wavelength of the ion-association complex is 612 nm.The apparent molar absorption coefficient is 1.58×105 L·mol-1·cm-1.Beer′s law is obeyed in the concentration rang of 0.26～0.40 μg/mL for phosphorus.The detection limit is 8.0×10-3 μg/mL.The method is applied to determination of phosphorus in the steel samples,the relative standard deviation is less than 5%,and the results are satisfactory.

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Ethyl violet can form an adsorption ion-association complex with phosphorus-molybdenum-vanadium heteropoly acid at 0.7 ～ 1.0 mol/L sulfuric acid medium by using the nonionic(O/w) microemulsion(OP/n-C5H11OH/n-C7H16/H2O).The composition ratio of phosphorus-vanadium-molybdenum heteropoly acid / ethyl violet is 1:2.The maximum absorption wavelength of the ion-association complex is 612 nm.The apparent molar absorption coefficient is 1.58×105 L·mol-1·cm-1.Beer′s law is obeyed in the concentration rang of 0.26～0.40 μg/mL for phosphorus.The detection limit is 8.0×10-3 μg/mL.The method is applied to determination of phosphorus in the steel samples,the relative standard deviation is less than 5%,and the results are satisfactory.

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Available abstract

Ethyl violet can form an adsorption ion-association complex with phosphorus-molybdenum-vanadium heteropoly acid at 0.7 ～ 1.0 mol/L sulfuric acid medium by using the nonionic(O/w) microemulsion(OP/n-C5H11OH/n-C7H16/H2O).The composition ratio of phosphorus-vanadium-molybdenum heteropoly acid / ethyl violet is 1:2.The maximum absorption wavelength of the ion-association complex is 612 nm.The apparent molar absorption coefficient is 1.58×105 L·mol-1·cm-1.Beer′s law is obeyed in the concentration rang of 0.26～0.40 μg/mL for phosphorus.The detection limit is 8.0×10-3 μg/mL.The method is applied to determination of phosphorus in the steel samples,the relative standard deviation is less than 5%,and the results are satisfactory.

Key concepts: Chemistry, Microemulsion, Spectrophotometry, Vanadium, Phosphorus, Molybdenum, Ion-association, Inorganic chemistry

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