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Silica
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Silica can exist as two forms in water. Predominant in feed-waters is the insoluble colloidal silica which acts as a particulate contaminant. A much smaller fraction can also exist in the soluble or reactive form. Reverse Osmosis removes essentially all of the insoluble form, but, not all of the soluble form. Thin film membranes remove a greater amount than cellulosic types. Ion exchange anion resins remove most of the soluble form and ion exchange resins in general can remove most colloidal silica if still present in the water. However, improperly maintained anion resins can release a polymerized form of silica which may be disruptive to IC manufacturing processes. The most commonly employed assay is the colorimetric molybdate-reactive heteropoly blue silica assay. Our detection limit for this method is 1 ppb.
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