science-softCon uv/vis+ photochemistry database; www.photochemistry.org; (C) science-softCon 2019 Substance: tetrasodium pyrophosphate Other Names: sodium pyrophosphate; tetrasodium phosphate; TSPP Formula: Na4O7P2 CAS-No.: 7722-88-5 PubChem: CID 24403 Study: uv absorption spectra Authors: M. Halmann, I. Platzner Title: The Photochemistry of Phosphorus Compounds. Part II. Far-ultraviolet Absorption Spectra of some Phosphorus Oxyanions in Aqueous Solution Journal/Source: J. Chem. Soc., 1440-1449, (1965); DOI: 10.1039/JR9650001440 Data: table, diagram Energy/Wavelength range: 180 - 320 nm Resolution: Temperature: 298 K Temperature dependence: no Pressure/Concentration: Phase: solution (water, deuterium oxide) pH: Comments: The absorption spectra of solutions of potassium dihydrogen phosphate, potassium and sodium hydrogen phosphates, tetrasodium pyrophosphate, sodium tripolyphosphate, and sodium trimetaphosphate in solvents containing water or deuterium oxide, in the range 320-180 nm, are composed of both weak bands (above 200 nm). Effects of temperature and solvents are investigated. Author to whom correspondence should be addressed: (e-mail address):