Abstract
The dissolution of iron from the iron utensil to the vegetable oil has been studied on using the iron plate and safflower oil with the dissolved water at 180°C. At this experiment, water was added dropwise to the safflower oil contained the iron plate at 180°C, and the relation between the amount of dissolved water and dissolved iron in the oil was investigated.
The amount of dissolved water in the oil was 5801168ppm for 13h at these conditions. The ratio of physically and chemically adsorbed water on the iron plate was 9.410.7% of the dissolved water in the oil. On the other hand, the ratio of iron and its oxides on the surface of the plate was 15:85 by measurement with ESCA. The ratio of the iron oxide derivative on the plate surface decreased from 81% to 34% under the same experimental conditions with 13h heating. At the same time, the dissolved amount of iron from the plate in the oil increased from 0.12ppm to 1.23ppm for 13h.
From these results, the dissolution process of iron from the iron plate in the oil was found to be that the iron oxides on the surface of the plate dissolved in the adsorbed water on the plate and then diffused into the oil.
