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A sensitive and selective molecular-emission method for the determination of phosphorus is described, in which the intense green emission obtained by nebulising orthophosphoric acid solution into a cool, nitrogenhydrogen diffusion flame is measured a t 528 mu. The limit of detection in aqueous solution under the conditions of measurement IS 0.1 p.p.m. of phosphorus.Most cations produce a depressive matrix effect that can be readily overcome by a preliminary ion-exchange separation. Fifty-fold molar excesses of acetic, hydrobromic, hydrochloric, nitric, oxalic, sulphuric and tartaric acids do not interfere.* For details of Part I of this series, see reference list, p. 78. 0 SAC and the author.