Abstract. Soil samples were randomly collected from 422 vegetable gardens in a study area centered in downtown Baltimore, Maryland, and having a radius of 48.28 km (30 miles). The levels of lead, four other metals (cadmium, copper, nickel, and zinc), and pH were measured for each location. The application of multi-response permutation procedures, which are compatible with mapping techniques, reveals that lead (as well as cadmium, copper, nickel, and

The vertical fluxes of alachlor, atrazine, simazine, and toxaphene were measured by air-sampling and aerodynamic measurements over a 24-day period after surface application to a fallow soil in eastern Maryland. The triazines were applied at 1.68 kg/ha as a wettable powder formulation and alachlor and toxaphene at 2.24 and 2.52 kg/ha, respectively, as emulsifiable concentrates. Calculated volatilization losses in the first 21 days were 780 g/ha toxaphene, 420 g/ha alachlor, 40 g/ha atrazine, and 21 g/ha simazine. Daily losses varied with soil moisture content, alachlor and toxaphene volatilization being reduced as the surface soil layers became dry. Daily volatilization patterns of atrazine and simazine indicated that some wind erosion of wettable powder formulation occurred as the surface soil dried, but the amounts transported were small. Volatilization losses of triazines were much smaller than disappearance by chemical degradation. A simple empirical equation was shown to yield estimated volatilization rates that were within about a factor of 10 of field-measured rates for six of eight compounds whose vapor pressures spanned a range of 104.