Phosphoryl trichloride. Documentation
Journal Title: Podstawy i Metody Oceny Środowiska Pracy - Year 2013, Vol 29, Issue 1
Abstract
Phosphoryl trichloride is a clear, colourless to yellow, fuming liquid with a pungent and musty odor. It hydrolyses in water or moist air to hydrogen chloride and orthophosphoric acid. Phosphoryl trichloride is widely used to manufacture alkil and aryl orthophosphate triesters. It is used for plasticizers, flame retardants, hydraulic fluids, insecticides, pharmaceuticals, gasoline additives and dye intermediates. Phosphoryl trichloride is also used as a chlorinating agent, catalyst, cryoscopy solvent and dopant for semiconductor grade silicon. A critical effect of exposure to phosphoryl trichloride is a strong irritation of eyes and the upper respiratory tract. Based on available data no NOAEL nor LOAEL values could be calculated. With regard to rapid hydrolysis of phosphoryl trichloride to hydrochloric acid and orthophos-phoric acid, establishing occupational exposure limits based on existing MAC (TWA) values for these hydrolysis products was proposed. Taking into account the method of determining phosphoryl trichloride in workplace air, relating to orthophos-phoric acid, a MAC (TWA) value of 1 mg/m3 and a STEL value of 2 mg/m3 were proposed by analogy to orthophosphoric acid. C notation, indicating corrosive action of phosphoryl trichloride, was assigned. There are no grounds for establishing a BEI value.
Authors and Affiliations
Katarzyna Konieczko, Sławomir Czerczak
Keywords
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