The use of variance analysis with repeated measurements designs for the evaluation of nickel migration from stainless steel cooking pans

The described model statement of a variance analysis with a repeated measurements design was used for the evaluation of test series, in which rhubarb as a corrosive foodstuff was prepared in stainless steel cooking pans with varying cooking/standing time periods (strain time), in order to separate the principal causes of a potential nickel transition into the foodstuff. With factory-new pan sets there can actually be detected an increasing nickel pick-up, depending of the time of strain. However, in reapeated preparings in the same or in other, used pans, the pick-up considerably decreases, and its not any higher than the rhubarb's natural content scattering range. Preparations of rhubarb in the pans obviously entail surface modulations of the steel which in rum minimize a further nickel emitance. Furthermore, the evaluation presented allows to assess that one cooking pan manufacturer has carried out measures conserning a pan surface treatment. Finaly the evaluation makes it possible to predict to which extent the inevitable analytic uncertainty may impair the results obtained.