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HomeRisk ManagementHealth, Safety & EnvironmentHealth & SafetyOccupational & Industrial HygieneSilica Determination
SGS uses mineralogical test methods, including X-Ray Diffraction (XRD), to determine free and respirable silica. XRD provides rapid identification of minerals and reveals detailed information about the chemical composition and crystallographic structure of your samples. It is useful for identifying fine grained phases which are difficult to identify optically, by Scanning Electron Microscope/Energy Dispersive Spectrometer (SEM/EDS) or Quantitative Evaluation of Materials by Scanning Electron Microscopy (QEMSCAN™).
For this test, a bulk sample is analyzed and the percent free silica (as alpha quartz) is reported. The free silica content is calculated by comparing the major quartz peak intensities of the sample with that of a standard lithium fluoride (LiF) mixture.
In the workplace, respirable silica is loaded onto a 25 mm, 0.5µm pore size silver membrane filter. This filter is located in an air filter cartridge in a respirator. The membrane filter is removed from the cartridge by SGS and submitted for XRD analysis. Two major quartz diffraction peaks are measured to avoid errors due to peak overlap. The amount of quartz present is calculated by comparing the normalized peak intensities of the sample with the peak intensities of known standards. A standard calibration is measured to ensure measurement quality.
SGS’s team of applied and process mineralogists have years of characterization experience. We have the equipment and expertise needed to conduct rapid, accurate silica determinations and a comprehensive quality control program. Partner with us to ensure your workplace is a healthy place.