Abstract

Conventional methods based on wet chemical analysis for investigating heavy metals in animal manure are relatively expensive and time-consuming. This study investigated the use of near infrared (NIR) spectroscopy to detect copper (Cu) in animal manure and then identified the spectral basis of the calibration. A total of 118 pig manure samples were collected from four provinces in China. Spectra were acquired in the range of 10,000 to 4000 cm⁻¹ using a Fourier-transform near infrared spectrometry system. Results showed that the prediction of Cu concentration in pig manure by NIR spectroscopy is feasible (r² = 0.84, root mean square error of prediction= 198 mg kg⁻¹, ratio of standard error to standard deviation = 2.4). Cu in pig manure can be detected by NIR spectroscopy because a high percentage of the Cu is complexed with CONH₂ or CONHR functional groups of organic ligands such as protein, urea, amino acids and other amide compounds.

© 2014 IM Publications LLP

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