![]() ![]() The SCBA diffractogram presented sharp reflections at 20.8°, 26.6°, 50.2°, and 59.9°, identified in Figure 1, which are typical of quartz. Nevertheless, the silica present in SCBA is mainly in crystalline form, as confirmed by the powder X-ray diffraction analysis ( Figure 1). In fact, sugarcane crops can take up between 500 and 700 kg Si.ha −1, while rice husk, a more studied silicon source, absorbs between 230 and 470 kg Si.ha −1. ![]() With silica present in significantly higher concentrations than other minerals ( p < 0.01), SCBA proved to be an efficient source of this mineral. The concentrations of the trace minerals sodium, aluminum, zinc, boron, copper, nickel, lead, and cadmium did not differ significantly between them ( p > 0.005). Silicon was the most abundant element, followed by potassium, iron, calcium, magnesium, and phosphorous. The minerals present in SCBA and their concentration are presented in Table 2. Sugarcane bagasse ashes presented 5.58 ± 0.05 g/100 g of moisture content, 82.28 ± 0.37 g/100 g of minerals, and 12.14 ± 0.16 g/100 g of organic matter.
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