title: Determination of fluoride in urinary calculi using a quantitative microdiffusion method.
abstract: A microdiffusion method for the separation of fluoride from other ions in urinary calculi has been developed, tested and assessed. The procedure involves digestion at 75 degrees C of samples with silicone-impregnated mixtures of nitric and perchloric acids in a specially designed diffusion cell and determination of the diffused fluoride with an ion-sensitive electrode. Several test samples were used to assess the recovery, accuracy and reproducibility of the procedure. Results for 20 stones of Indian origin are presented and discussed.
authors.affiliation: Department of Physical Chemistry, University of Cape Town, Rondebosch.
authors.forename: M A
authors.initials: MA
authors.lastname: Wandt
authors.forename: A L
authors.initials: AL
authors.lastname: Rodgers
mesh_terms: D005459:Fluorides / Q000032:analysis*; D006801:Humans; D014545:Urinary Calculi / Q000032:analysis* / Q000209:etiology
chemical_list: D005459:Fluorides