. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1027 Contribution from the Bureau of Chemistry W. G. CAMPBELL, Acting Chief. Washington, D. C. April 17, 1922 POISONOUS METALS ON SPRAYED FRUITS AND VEGETABLES. By W. D. Lynch, Assistant Chemist, G. C. McDonnell, Chief, Insecticide and Fungicide Laboratory, and J. K. Haywood, Chief, Miscellaneous Division, Bureau of Chemistry; A. L. Quaintance, Entomologist in Charge, Fruit Investigations, Bureau of Entomology; and M. B. Waite, Pathologist in Charge, Fruit-Disease Investigations, Bureau of Plant Industry.^
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 1027 Contribution from the Bureau of Chemistry W. G. CAMPBELL, Acting Chief. Washington, D. C. April 17, 1922 POISONOUS METALS ON SPRAYED FRUITS AND VEGETABLES. By W. D. Lynch, Assistant Chemist, G. C. McDonnell, Chief, Insecticide and Fungicide Laboratory, and J. K. Haywood, Chief, Miscellaneous Division, Bureau of Chemistry; A. L. Quaintance, Entomologist in Charge, Fruit Investigations, Bureau of Entomology; and M. B. Waite, Pathologist in Charge, Fruit-Disease Investigations, Bureau of Plant Industry.^ Purpose of investigation Results of previous investigations Experimental work CONTENTS. Page. I Page. 1 Results of experimental work IS 1 Summary 58 16 Literature cited 58 PURPOSE OF INVESTIGATION. In the spring of 1915 a cooperative study was undertaken in the United States Department of Agriculture to ascertain the amounts of arsenic, lead, and copper remaining on fruits and vegetables treated with poisonous sprays. The spraying was done under the direction of the Bureau of Entomology and the Bureau of Plant Industry, and the chemical work by the Bureau of Chemistry. The plan was to spray various fruit trees and vegetables according to accepted schedules, and also with excessive amounts of material to determine how much of the metals may be present under adverse conditions. In case the investigation showed that poisonous metals remained on the fruit in amounts which might prove injurious to the consumer, the results would constitute a basis for so changing or regulating the spraying schedules as to eliminate this danger. RESULTS OF PREVIOUS INVESTIGATIONS. Arsenical compounds first appeared as insecticides in the United States (63)^ about 1860, when Paris gi;een was used to check the ' Credit is due to John G. Fairchild and Wilbur A. Gersdorff for assistance in the analytical work re- ported in this paper. ' Figures in parentheses refer to Literature Cited, pp. 58 to 66. 72S
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