NIOSH 7401

Alkaline Dusts

This method was was validated using generated atmospheres of NaOH over the range 0.76 to 3.9 mg/m3 using a 360-L sample. The NaOH concentration was independently verified by analyzing additional samples for sodium by atomic absorption spectrophotometry. An overall average collection efficiency of greater than 99% was found by sampling 1 to 360 L in an atmosphere of 7.50 mg/m3 (NaOH) using backup Fluoropore™ filters and also by collecting two 615-L samples using backup impingers filled with water.

Analysis Type (Application Method): Acid based titration

Link to NIOSH 7401 Method

Compatible Filters:

37 mm 1.0 μm PTFE supported by a cellulose back up pad in a cassette filter holder. Forceps to handle filter membrane.

Materials

     
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