Diagnosis of contamination of soil by toxic metals from urban solid waste and influence of organic matter

Abstract

In recent years, the disposal of urban solid waste (USW) in inadequate places has been increasing in Brazil. The objective of this study was to evaluate the contamination of lead, cadmium, copper, manganese, chromium, iron, nickel, cobalt and zinc metals and their relationship with organic matter (OM) in the vicinity of the city's "dump" Iguatu, Ceará. Eight soil samples were collected in the layer from 0 to 0.20 m depth. The pH was carried out in distilled water, the OM by wet oxidation with potassium dichromate. The extraction of metals was carried out via acid digestion and its quantification by atomic absorption spectrometry. The results were compared with the soil guiding values established by CONAMA Resolution 430/2009. Analysis of the soil samples showed levels of Cr