Determination of petroleum oil deposits on Citrus sinensis (L.) Osbeck leaves
1991
Allender, W.J. | Beattie, G.A.C.
Oil deposited on citrus leaves when sprayed with oil-in-water emulsions was measured by gas-liquid chromatography of a hexane/acetone/water/ethyl acetate extract of the leaves. To overcome the problem of decreased recoveries with increased time between spraying and extraction, a refluxing step was included in the procedure followed by Florisil clean-up prior to analysis. Mean oil recoveries of 81% were obtained and, unlike recoveries using published methods, they were independent of time between application and extraction. The method is intended to be used in trials to determine the relationship between spray volume, Chinese wax scale mortality and petroleum oil deposition on citrus leaves sprayed by low-, medium- and high-volume sprayers.
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