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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


FALONE, Sandra Zago  and  VIEIRA, Eny Maria. Adsorption/desorption of the explosive tetryl in peat and yellow-red argissol. Quím. Nova [online]. 2004, vol.27, n.6, pp.849-854. ISSN 0100-4042.

This paper presents the study of adsorption/desorption of the explosive tetryl (2,4,6-trinitrophenylmethyl-nitramine) in different matrices, such as in natura soil, roasted soil, humic acid of soil, in natura peat, roasted peat and humic acid of peat. The aim of the study is to evaluate the interaction capacity of those matrices with the explosive. The analytic technique used was HPLC (high performance liquid chromatography), with UV-detection at 230 nm. The Freundlich isotherms were utilized for the mathematical treatment of the data. The results indicated that in natura soil and in natura peat (with organic substances) are excellent matrices for the retention of tetryl, adsorbing it and keeping it immovable, preventing it from contaminating the groundwater. The largest adsorption of the explosive ocurred in in natura soil, while the smallest desorption was observed in in natura peat. After the calcination of the matrices, the smallest adsorption was observed, indicating that the retention occurs in the organic substance.

Keywords : explosive; adsorption; desorption.

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