Determination of phosphorus in lubricating oils by cool-flame emission spectroscopy.

Flame emission photometer for determining phosphorus in air and natural waters.

The phosphorus content of fire-resistant textiles is determined by measurement of the emission intensity at 528 nm of the HPO molecular species, produced by aspiration of an aqueous sample extract into a cool hydrogen-nitrogen diffusion flame. In the case of durable flame-retardant agents, a preliminary fusion of the textile with potassium hydroxide is necessary, followed by an ion-exchange treatment of the extract; non-durable flame-retardants are determined directly, after water extraction of the material and ion-exchange separation.

The Determination of Phosphorus in Fire-Resistant Textiles by Cool-Flame Emission Spectroscopy:

A method is described for the determination of phosphorus in solid detergents. Nitric acid plus perchloric acid followed by treatment of the residue with hydrofluoric acid serves admirably to dissolve detergents in aqueous solutions. The phosphorus is determined by atomic absorption spectroscopy using a phosphorus hollow cathode tube. The method of additions is utilized to overcome matrix interference. The values obtained for phosphorus are in good agreement with a standard colorimetric method. No loss occurred by volatilization.

Determination of total phosphorus in detergents by atomic absorption spectroscopy.

Flame and Plasma Emission Analysis

The total phosphate content of detergent materials is determined by measurement of the emission of the HPO molecular species at wavelength 528 nm in a cool hydrogen-nitrogen diffusion flame. Preliminary treatment with cation-exchange resin is necessary to remove interference by metals. Analytical results on detergent samples containing up to 20 per cent. of phosphates (expressed as P2O5) indicate a precision of the order of 2 to 4 per cent. for the method.

R. A. Mostyn

Papers

The determination of phosphate in detergents by cool-flame emission spectroscopy