| 2662 Assessment of Methodologies for the Evaluation of Fluoridated Salt | ||
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A.E. SOTO-ROJAS1, J. MARGINEDA2, D. ZERO1, and E.A. MARTINEZ-MIER3, 1Indiana University, Indianapolis, USA, 2Departament de Química, Facultad de Ciences, Universitat Autònoma de Barcelona, Spain, 3Indiana University Because of safety and quality control, monitoring of salt fluoride (F) concentration is recommended. Analytical techniques used to conduct this monitoring have not been standardized and universal procedures for determination of F in salt have not been established. Objective: to assess modifications to the direct and diffusion methods for F analysis in fluoridated and non-fluoridated salt. Methods: Ultra-pure NaCl samples and commercial non-fluoridated salt samples were prepared to contain known amounts of F. Salts were poured, (0.1 g) undiluted, into beakers containing 1 ml of standard F solutions (0.5-20 ppm), adding TISAB II and analyzed. In the second modification, salts were added to the same F standard solutions but these were diluted with deionized water (1:10 v/v) and pipetted out 24 hours later and analyzed. For the diffusion method, salts were poured (0.1 g) undiluted directly into a petri dish and analyzed. Results: Using the direct method, F recoveries in ultra-pure NaCl ranged from 87 to 100% when poured directly into F standards, in commercial salts recovery was of 90%; values obtained when these salts were diluted were of 67%. When these values were compared, a statistically significant difference was found (p < 0.05). Results obtained using F standards adding ultra-pure NaCl produced a 10% increase in recoveries of F in commercially fluoridated salt. For diffusion analysis recoveries were of 96%. Conclusions: Determination of fluoride content may be influenced by NaCl and other ions contained in commercial salt. The diffusion method was most effective to determine total F content. It is recommended to use the diffusion method for the determination of total F in salt samples. The less technique sensitive direct method, using undiluted samples, can be employed when the goal is the determination of available F using F standards adding ultra-pure NaCl. Supported by NIH-1-R21-DE-14716-1 | ||
| Seq #295 - F Products and Measurements 10:45 AM-12:45 PM, Saturday, 12 March 2005 Baltimore Convention Center 329 | ||
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