Caracterização de amostras comerciais de vermicomposto de esterco bovino e avaliação da influência do pH e do tempo na adsorção de Co(II), Zn(II) and Cu(II)

Química Nova

João Da Paixão Soares²  Jovino Araújo De Souza²  Éder Tadeu Gomes Cavalheiro¹ 

[1] ,Universidade Federal de São Carlos Departamento de Química São Carlos SP

关键词: vermicompost;    thermogravimetry;    metal ion adsorption;   

DOI  :  10.1590/S0100-40422004000100002

来源: SciELO

【 摘 要 】

Some commercial samples of vermicompost from bovine manure (humus) were characterized by thermogravimetry with respect to humidity, organic matter and ash contents, the percentages of which range from 6.55 to 5.35%, 53.01 to 69.96% and 46.44 to 66,14%, respectively. The capacity of adsorption of Cu2+, Zn2+ and Co2+ ions by these samples has been evaluated as a function of pH and time. The contents of several metal ions in the original vermicompost samples have been determined by flame atomic absorption spectrometry after digestion in a microwave oven. The high nitrogen content suggests that the earthworms used in the maturation procedure lead to an efficient degradation of organic matter. The metal retention was affected by both pH and adsorption time. The results also show that adsorption follows the order Cu2+ > Zn2+ > Co2+.

【 授权许可】

CC BY-NC   
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