Abstract
Lead arsenate was used for insect control in apple and other fruit orchards for many years. To determine the magnitude and migration of remaining soil residues of arsenic and lead, samples of a clay and a sandy soil were taken at increasing depths at 10 orchard sites in the Georgian Bay region of Ontario, Canada, 5 in which either the clay or sandy soil types were located. The rate of decrease in concentration of each element with depth was significantly greater in the sand than in the clay suggesting that downward movement of both elements occurred less readily in the sandy soil. In each soil type, the rate of decrease in concentration of lead with depth was significantly greater than for arsenic suggesting that lead was less mobile than arsenic in the soil profile regardless of texture. The toxic effects of arsenic and lead in orchard soils on plants and animals are discussed.
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