Deternination of Oil Deposit on Citrus Leaves by the Steam-Distillation Method1, 2, 3

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Abstract
Directions are given for the adaptation of a previously descr. steam-distillation method of determining spray oil deposit to the quantitative detn. of deposits of 2 of the lighter grades and 4 of the standard grades of spray oils, on lemon leaves. The major difference between this adaptation and the kerosene adaptation previously descr. lies in the use of dilute H3PO4, instead of an aqueous soln. of H2SO4, HNO3, and Al2(SO4)3, as the leaf decomposition medium. Data are presented to justify the alterations adopted for this expanded utility and to indicate the high degree of reproducibility and efficiency of this new adaptation. The results from 42 representative calibration tests (7 runs for each of the 6 oils studied) indicate an average standard deviation of 1.63% for these oils.

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