An extension to 鈥淢id-infrared spectral interpretation of soils: Is it practical or accurate?鈥?/span>

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• 作者：Xueming Yang¹ ; ^{xueming.yang@agr.gc.ca" class="auth_mail}
• 关键词：Soil mid-infrared spectroscopy ; Spectral subtraction ; Organic matter removal ; Dry ashing ; Wet ashing ; Organic ashing remains
• 刊名：Geoderma
• 出版年：August, 2014
• 年：2014
• 卷：226-227
• 期：Complete
• 页码：415-417
• 全文大小：328 K

文摘

This note extends the topic of the performance of ashing soil samples and then using spectral subtraction of diffuse reflectance Fourier transform mid-IR spectroscopy (DRIFTS) of original and ashed samples in highlighting the significance of the organic fraction. It was found that accurately interpreting the ash subtracted spectra (mid-infrared range from 4000 cm^鈭?#xA0;1 to 400 cm^鈭?#xA0;1) is nearly impossible not only because soil minerals undergo extreme spectral changes from the ashing process but also because inorganic residues from burning soil organic matter (mainly humic substances) also confound the spectra of the mineral fraction. Removing soil organic matter using wet ashing methods with H₂O₂, NaOCl, or Na₂S₂O₈ is associated with inaccuracies in spectra interpretation from organic remains (uncompleted organic matter removal) and spectral changes of minerals from wet ashing processes. Accordingly, with the current techniques of dry and wet ashing it is impossible to accurately interpret the ash subtracted spectra of soil samples.