Carey A E
Pestic Monit J. 1979 Jun;13(1):23-7.
Organochlorine pesticides were monitored annually in the major agricultural areas of the United States from 1968 to 1973. Results show that agricultural soils are widely contaminated with low levels of organochlorine residues. Residue concentrations are decreasing as applications of the compounds decrease. Annual monitoring of urban areas since 1969 has demonstrated that urban soils generally have higher pesticide residue concentrations than do agricultural soils in the same locations. High concentrations of mercury, cadmium, and lead have also been observed in urban soils.
1968年至1973年期间，美国主要农业地区每年都会对有机氯农药进行监测。结果表明，农业土壤广泛受到低水平有机氯残留的污染。随着这些化合物使用量的减少，残留浓度也在下降。自1969年以来对城市地区的年度监测表明，城市土壤中的农药残留浓度通常高于同一地点的农业土壤。在城市土壤中还观察到高浓度的汞、镉和铅。
