Journal
TALANTA
Volume 72, Issue 2, Pages 791-799Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2006.12.005
Keywords
FTIR; PLS-R; humic acid; respiration activity; compost
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Fourier transform infrared (FTIR) spectroscopy has been proven to be an appropriate analytical method for the qualitative assessment of compost stability. This study focuses on quantitative determination of two time-consuming parameters: humic acid (HA) contents and respiration activity. Reactivity/stability and humification were quantified by respiration activities (oxygen uptake) and humic acid contents. These features are also reflected by a specific infrared spectroscopic pattern. Based on this relationship partial least squares regression (PLS-R) models for the prediction of respiration activities and humic acid contents were calculated. Characteristic wavenumber regions that are assigned to the biological/chemical parameter were selected for multivariate data analysis. The coefficient of determination (R-2) obtained for the humic acid prediction model from infrared spectra was 87% with a root mean square error of cross-validation (RMSECV) of 2.6% organic dry matter (ODM). The prediction model for respiration activity resulted in a R-2 of 94% and a RMSECV for oxygen uptake of 2.9 mg g(-1) dry matter (DM). (c) 2006 Elsevier B.V. All rights reserved.
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