ASTM D95 - A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1.
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French Books. Foreign Books. Books by theme. European Standards. US Standards. French Standards. International Standards. Foreign Standards. EEC report. International Report. US Report. Rapport France. Pressure equipment. EC Standards. It is applicable to most waters, but some waters may require filtration and dilution to remove interferences from color and turbidity. Due to the complexity of silica chemistry, the form of silica measured is defined by the analytical method as molybdate-reactive silica.
Those forms of silica that are molybdate-reactive include dissolved simple silicates, monomeric silica and silicic acid, and an undetermined fraction of polymeric silica.
It is particularly applicable to treated industrial waters. It may be applied to natural waters and wastewaters following filtration or dilution, or both. For seawater or brines, this test method is applicable only if matched matrix standards or standard addition techniques are employed. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This is acceptable when, as frequently occurs, the molybdate-reactive silica is in the milligram per litre concentration range while the nonmolybdate-reactive silica, if present at all, is in the microgram per litre concentration range.
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Standard Test Method for Silica in Water
Active view current version of standard. Other Historical Standards. More D It is applicable to most waters, but some waters may require filtration and dilution to remove interferences from color and turbidity. Due to the complexity of silica chemistry, the form of silica measured is defined by the analytical method as molybdate-reactive silica.
Historical Version s - view previous versions of standard. More D It is found as the oxide in crystalline forms, as in quartz; combined with other oxides and metals in a variety of silicates; and in amorphous forms. Silicon is the most abundant element in igneous rocks and is the characteristic element of all important rocks except the carbonates.