| Abstract: | Abstract Leaf samples of glasshouse crops may be severely contaminated. Five experiments were carried out to determine how the contaminants could best be removed. The effects of the materials and equipment used in the drying and milling of the samples were also investigated. Various washing solutions and methods were compared in the experiments. On the whole, the best results were obtained by washing with a solution of Teepol or hydrochloric acid. In cases of severe contamination, a combination of Teepol and acid may be recommended. When drying and milling crop samples, it is essential to avoid contact with materials containing elements for which the samples are to be analysed. The washing procedures proved to have an effect on the contents of. some trace elements, but not on the contents of major elements. Recommendations are given for washing crop samples. |
