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

Quimica nova

Soares, João da Paixão¹  Souza, Jovino Araújo de¹  Cavalheiro, Éder Tadeu Gomes² 

[1] Universidade Federal de São Carlos, São Carlos;Universidade de São Paulo, São Carlos

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 commercialsamples of vermicompost from bovine manure (humus) were characterized by thermogravimetrywith respect to humidity, organic matter and ash contents, the percentages ofwhich 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 contentsof several metal ions in the original vermicompost samples have been determinedby flame atomic absorption spectrometry after digestion in a microwave oven.The high nitrogen content suggests that the earthworms used in the maturationprocedure lead to an efficient degradation of organic matter. The metal retentionwas affected by both pH and adsorption time. The results also show that adsorptionfollows the order Cu2+ > Zn2+ > Co2+.

【 授权许可】

CC BY