ALS analyzes dusts that may contain crystalline forms of silica, which can cause silicosis.
Certain working environments present a higher number of safety hazards for employees. One of the safety hazards identified by OSHA and NIOSH is silica dust exposure during hydraulic fracturing.
Dusts containing crystalline forms of silica (quartz, cristobalite, and tridymite) may cause silicosis. Interference can occur in IR and visible spectrometry methods to give false values.
ALS locations hold accreditations relevant to their work and area of operation. Participation in NELAP, CALA, AIHA-LAP, DOD, various state and other programs is location-specific.
ALS offers analysis for silica using NIOSH Method 7500 by X-Ray Diffraction. NIOSH Method 7500 is able to speciate the different crystalline forms of free silica and differentiate from most interference in bulk or air filter samples.
- Amorphous silica does not interfere
- Secondary peaks may allow quantitation if interferences are present
- Silica interferences may be removed with acid pre-treatment
- Total weight and silica analyses may be done on same filter