Microdiffusion and fluoride-specific electrode determination of fluoride in infant foods: collaborative study.
Twelve laboratories analyzed (1 replicate) 12 samples of infant foods--milk, pears, and peas--containing 0.2-5 ppm F. There was one laboratory outlier. Mean coefficients of variation were 7.06% for intralaboratory determination of 3 sets of blind duplicates and 21.6% for interlaboratory determination of 12 samples. Variance analysis for all samples yielded a reproducibility standard deviation of 0.41 ppm; for 3 sets of blind duplicates, repeatability standard deviation was 0.26 ppm and reproducibility standard deviation was 0.32 ppm.
D004058:Diffusion; D004566:Electrodes; D005459:Fluorides / Q000032:analysis*; D006801:Humans; D007223:Infant; D007225:Infant Food / Q000032:analysis*; D008722:Methods
D005459:Fluorides