3. Results and Discussion
The starch based standards which were spiked with mineral stock solutions, proved to be
a very good calibration method for SXRF rapid quantitative analysis of minerals. XRF spectra
were collected up to 20480 eV, and the elements of interest with their defined peak areas in the
present study are described in Table 1. Control sample (blank starch spiked with deionized
water) showed minimal mineral peaks. Starch spectrum is dominated by the fluorescence from
Argon present in air and traces of Cu, Ca and Fe (Fig. 2a). Fig. 2b shows the SXRF spectra from
starch spiked with highest concentration of respective minerals (1000 mgKg-1 for Ca and 100
mgKg-1 for all others minerals) used in this study, where the blue and black lines represent the
raw and background-removed spectra, respectively. The spectra from wheat (AC Vista, moisture