Phosphorus Bases Research Articles

ChemInform Abstract: Matrix-Infrared Spectra of Structural Isomers of the Phosphorus Oxysulfide P4S3O.

Photolysis of the P 4 S 3 --O 3 molecular complex in solid argon with red light produced two sets of new infrared absorptions including terminal PO and symmetric P-S-P stretching modes, which are assigned to structural isomers of P 4 S 3 O with terminal oxygen at the apex and base phosphorus positions of P 4 S 3 . Further ultraviolet photolysis produced evidence for oxo-bridged P 4 S 3 O and a secondary product, P 4 S 3 O 2

Comparison of Methods for the Preparation of Sewage Sludge Samples Prior to the Spectrophotometric Determination of Phosphorus

Abstract Three procedures for the preparation of sewage sludge samples prior to the colorimetric determination of phosphorus as “molybdenum blue” were evaluated. Using samples of the US EPA's municipal digested sludge as a reference material, sulfuric acid/ammonium persulfate digestion, muffle furnace ignition followed by extraction of the ash with hydrochloric acid, and direct extraction of the sewage sludge with sodium bicarbonate solution were compared in terms of phosphorus recovery as determined by colorimetric measurements. On the basisof phosphorus recovery, the samples prepared by muffle furnace ignition/hydrochloric acid extraction of the ash showed the best accuracy and precision. This procedure was also superior in terms of the time and effort expended in the preparation of the sewage sludge samples.