LEAD, ARSENIC, AND COPPER CONTENT OF CROPS GROWN ON LEAD ARSENATE-TREATED AND UNTREATED SOILS

Abstract

Increased lead and arsenic concentrations in the surface soil (0–15 cm), resulting from applications of lead arsenate (PbHAsO4), increased both lead and arsenic levels in crops grown on treated plots. The lead levels in some crops approached or exceeded the Canadian residue tolerance of 2.0 ppm. Lead arsenate soil treatments did not affect copper absorption by crops. On areas such as old orchard land contaminated with lead arsenate residues it may be advisable to ascertain the soil lead status before planting certain crops, and also to determine the lead affinity and arsenic sensitivity of the plants to be grown.