Qualitative Characterization of Silica Phases in Commercially Bottled “Silica Water”

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This research aims to elucidate the physical forms of silica present in commercially bottled silica water.
Analyzed 31 types of bottled silica water using X-ray diffraction (XRD) and X-ray fluorescence (XRF).
Determined the chemical properties of precipitate residues in the samples.
Assessed the presence of crystalline silica phases, including cristobalite, tridymite, and quartz.
Detected crystalline silica in 13 out of 31 products, predominantly cristobalite, followed by tridymite and quartz.
XRF analysis revealed significant variability in elemental composition, particularly sodium, calcium, carbon, and chlorine.
Observed geographical bias, with higher detection rates of crystalline silica in products from volcanic regions like Kyushu.

Qualitative analysis reveals crystalline silica in bottled silica water, indicating the need for evaluation standards.

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Tateda et al. (2026) studied this question.

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