Instruments for the analysis of foreign matter can be broadly categorized into X-ray fluorescence spectrometers (EDX) for inorganic matter and Fourier transform infrared spectrophotometers (FTIR) for organic matter. However, some types of foreign matter cannot be characterized by either FTIR or general-purpose EDX instruments. One typical case is inorganic carbon, such as burned rice. For such a situation, the EDX-800HS, incorporating special detector that enables it to perform analysis from 6C, can be utilized to analyze burned rice. When 6C is detected by EDX, and it cannot be identified by FTIR, it is likely to be inorganic carbon.
Two samples were measured: (1) dried and crushed steamed rice and (2) steamed rice dried, crushed, and carbonized in an electric furnace.
The qualitative analysis results were superimposed for the steamed rice samples before carbonization (1) and after carbonization (2). 6C is clearly detected in both, but carbon is relatively increased in the carbonized rice (2). The results also suggest a relative increase in oxygen in the rice components, as well as oxygen in the water content.
The instrument directly irradiates the sample with X-rays and measures the energy and intensity of the secondary fluorescent X-rays that are generated. This permits non-destructive characterization of the constituent elements of the sample (qualification) and measurement of their concentrations (quantification). This easy-to-use method is extremely rapid, as no chemical pretreatment is required and multiple elements are analyzed simultaneously, and can be used for solid, powder, and liquid samples.
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