Abstract
Soil micromorphological studies have used various techniques for pore analysis, including optical measurements, electron microscopy and computed tomography. This study examined a method based on X-ray photon mapping, in which a scanner obtains the sample's X-ray spectrum, selects those portions which have been specified as the elements to map and then only separates that part of the spectrum to be analysed by the software. With this new technique, the resulting chemical maps are composed of the distribution of selected elements within the sample and the only digitising is to convert the analogue X-ray signal into a digital signal that can be computer processed. The approach provided two-dimensional chemical maps of soil blocks, clearly showing macropore sizes and distributions and enabling calculation of macroporosity values. The results showed mean macroporosity values of 17–18%. The main benefits of the technique are the precision of data and image processing and the elimination of laborious thin section preparation, as hardened soil blocks can be scanned automatically.
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