Analysis for total sulfite in foods by using rapid distillation followed by redox titration
DeVries, J.W.; Ge, H.; Ebert, F.J.; Magnuson, J.M.; Ogawa, M.K.
Journal - Association of Official Analytical Chemists 69(5): 827-830
1986
ISSN/ISBN: 0004-5756 PMID: 3771455 Document Number: 345
A rapid and accurate analysis for total sulfite as sulfur dioxide has been developed for foods and food products. The method, which combines a selective distillation cleanup procedure with the selective redox titration of sulfite ion by iodine, has been applied to a variety of foods and food products over a period of time with no significant interference encountered in any matrixes other than garlic and leeks. For the foods analyzed, the method typically shows a detection limit of 10 ppm, a relative standard deviation of 7.5% (compared with 10.4% for similar matrixes by the Monier-Williams method), and recoveries of 97.9 +/- 6.4%. Comparison of results for this method with those obtained using the Monier-Williams method showed a mean value for the distillation/titration method of 241 ppm compared with 242 ppm for the Monier-Williams method. A correlation of 0.991 and odds of a difference between methods of 10.7% (Student's paired t-test (1-alpha) X 100) were obtained for those matrixes where no interferences were encountered with either method.
Document emailed within 1 workday
