Evaluation of Uncertainty of Trichloromethane Extract

Abstract

— The overall migration of pulp molding tableware in its food simulants often exceeds the prescribed limit. When that happens, the chloroform extraction experiment should be conducted to determine the residual content. In this paper, the overall migration of pulp molding tableware in the food simulant of 4% (volume fraction) acetic acid and the residual mass of chloroform extraction were tested. The influencing factors of the uncertainty were analyzed, the mathematical model of the uncertainty amount of the total migration amount was established by the experimental method, and the uncertainty components were calculated. The experimental results showed that the expanded uncertainty was 0.278mg/dm 2 (k=2), and the determination result after chloroform extraction was (13.25±0.278) mg/dm 2 .