Heavy metals in the soil and castor bean plants fertilized with sewage sludge stabilized by different processes by Altina Lacerda Nascimento, Maria Clara Oliveira Durães, Regynaldo Arruda Sampaio, Geraldo Ribeiro Zuba Junior, Fabiano Barbosa de Souza Prates, Luiz Arnaldo Fernandes, Everaldo Zonta, Nelson Moura Brasil do Amaral Sobrinho

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