116. For the determination of dioxydiphenylmethane (DDM) in vegetables, thin layer chromatography was used to separate and quantify by spot area S. For standard samples, the following data were obtained:

C(DDM), μg/0.02 cm3 1.25 2.56 6.40 18.2 25.1
S, mm2 9 13 23 58 80

150 g of carrots were treated with 100 cm3 of alcohol, which was then evaporated to 10 cm3. Chromatography of 0.02 cm3 of this solution gave a spot with an area of 35 mm2. Determine the content of dioxydiphenylmethane in carrots (mg/kg).

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