Characterization of commercial samples of vermicompost from bovine manure and evaluation of the influence of pH and time on Co(II), Zn(II) and Cu(II) adsorption

Química Nova

Universidade Federal de São Carlos, São Carlos¹  Soares, João da Paixão¹  Cavalheiro, Éder Tadeu Gomes¹  Universidade de São Paulo, São Carlos¹  Souza, Jovino Araújo de¹ 

关键词: vermicompost;    thermogravimetry;    metal ion adsorption.;   

DOI  :  10.1590/S0100-40422004000100002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 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】

Unknown